QuakeFeed in App Store, Webinar, White Paper

by James Richards December 01, 2010

QuakeFeed Now Available in the App Store

QuakeFeed is now available in the App Store! This is a free app that I've created using the Esri ArcGIS API for iOS.

Download Now: QuakeFeed in the iTunes Store

The app displays all earthquakes from the past 7 days with a magnitude > 2.5 on a map or in list. Six beautiful base maps are provided by Esri. A variety of filter and sort options are available. The app is location aware so you can find quakes that are closest to you. It has an intuitive user interface and features Twitter, Facebook, and email integration.

QuakeFeed Screenshot

 

Esri ArcGIS for iOS Webinar Archive

Earlier this month I participated in a Directions Media Webinar in which I shared some tips & tricks and lessons learned while developing QuakeFeed and working on another ArcGIS API for iOS integration project for our client CitySourced. The archive of this webinar is now available on the Directions site.

View now: ArcGIS for the iPhone and iPad (Registration Required). 

Note: My portion of the Webinar starts at 22:45.

 

Esri ArcGIS For iOS White Paper

For this event, myself and Kurt Daradics of CitySourced also collaborated on a technical white paper.

The paper begins with an overview of the CitySourced app and the reasons why they migrated to the ArcGIS API for iOS.

A technical discussion follows, with code samples that show:

  • Base map options available through the API.
  • Waiting for the map to load before drawing graphics.
  • How to perform WGS84 to Web Mercator transformation on the device.
  • Tips for drawing pins on the map for improved usability.

Dowload now: CitySourced ArcGIS API for iOS Implementation

For those if you interested in working with the ArcGIS API for iOS, I'll be expanding on these topics and more in the coming weeks.

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ESRI | iOS | iPhone

Esri ArcGIS for iOS Webinar

by James Richards November 12, 2010

I've been "crazy busy" the past few months working on some iPhone projects. I'll share some of the things I've learned about working with the Esri ArcGIS API for iOS in the upcoming Access ArcGIS on the iPhone and iPad webinar hosted by Directions Media.

I'll be joining Dave Cardella of Esri (@dcardella) and Kurt Daradics of CitySourced (@kurtyd). I will share some real world tips & tricks about working with the API that were learned while integrating Esri maps into CitySourced's iPhone app.

This free webinar kicks off at 2:00 pm EST next Tuesday, November 16th. You can find more info and sign up for the webinar here: https://www2.gotomeeting.com/register/882551307

Hope you'll join us!

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ESRI | iPhone | Mobile | iOS

ESRI ArcGIS iPhone API – Class Breaks Renderer Sample

by James Richards June 04, 2010

Introduction

Here is a quick sample demonstrating the use of a Class Breaks Renderer in the ESRI ArcGIS iPhone API. The sample queries an ArcGIS Server Map Service for cities in California and renders them as graphics based on the population. Here’s a screenshot of the app running in the simulator.

ClassBreaks

Click here to download the source code from this article.

[more]

Discussion

If you’ve been programming with any of the ESRI Client APIs, then you’ll recognize the Class Breaks Renderer concept. For those who aren’t familiar, here’s a snippet from the Working with Symbols and Renderers section of the ArcGIS iPhone SDK Concepts documentation:

A class breaks renderer symbolizes each Graphic based on the value of some numeric attribute. Graphics with similar values for the attribute get the same Symbol. The "breaks" define the values at which the symbology changes.

Code Listings

ClassBreaksViewController.h

#import <UIKit/UIKit.h>
#import "AGSiPhone.h"

#define kTiledMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer"
#define kDynamicMapServiceURL @"http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0"

@interface ClassBreaksViewController : UIViewController<AGSMapViewDelegate, AGSQueryTaskDelegate> {
    AGSMapView *mapView;
    AGSGraphicsLayer *cityGraphicsLayer;
    AGSQueryTask *cityQueryTask;
    
}

@property (nonatomic, retain) IBOutlet AGSMapView *mapView;
@property (nonatomic, retain) AGSGraphicsLayer *cityGraphicsLayer;
@property (nonatomic, retain) AGSQueryTask *cityQueryTask;

@end

ClassBreaksViewController.m

#import "ClassBreaksViewController.h"

@implementation ClassBreaksViewController

@synthesize mapView;
@synthesize cityGraphicsLayer;
@synthesize cityQueryTask;

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Set map view delegate
    self.mapView.mapViewDelegate = self;
    
    // Create tile base map layer
    AGSTiledMapServiceLayer *tiledLayer = [[AGSTiledMapServiceLayer alloc] initWithURL:[NSURL URLWithString:kTiledMapServiceURL]];
    [self.mapView addMapLayer:tiledLayer withName:@"BaseLayer"];
    [tiledLayer release];
    
    // Create grpahics layer
    self.cityGraphicsLayer = [AGSGraphicsLayer graphicsLayer];
    
    // Create symbols for the three class breaks
    AGSSimpleMarkerSymbol *lowSymbol = [AGSSimpleMarkerSymbol simpleMarkerSymbol];
    lowSymbol.color = [UIColor colorWithRed:151.0/255.0 green:216.0/255.0 blue:255.0/255.0 alpha:0.8];
    lowSymbol.outline.width = 0;
    lowSymbol.size = 15;
    
    AGSSimpleMarkerSymbol *mediumSymbol = [AGSSimpleMarkerSymbol simpleMarkerSymbol];
    mediumSymbol.color = [UIColor colorWithRed:255.0/255.0 green:165.0/255.0 blue:83.0/255.0 alpha:0.8];
    mediumSymbol.outline.width = 0;
    mediumSymbol.size = 20;
    
    AGSSimpleMarkerSymbol *highSymbol = [AGSSimpleMarkerSymbol simpleMarkerSymbol];
    highSymbol.color = [UIColor colorWithRed:222.0/255.0 green:0.0 blue:0.0 alpha:0.8];
    highSymbol.outline.width = 0;
    highSymbol.size = 25;
    
    // Create a class breaks renderer with a default simple marker symbol and an attribute field
    AGSClassBreaksRenderer *cityRenderer = [AGSClassBreaksRenderer
                                            classBreaksRendererWithDefaultSymbol:lowSymbol 
                                                               forAttributeField:@"POP1990"];
    
    // Create three AGSClassBreak objects, one each for low, medium and high populations
    AGSClassBreak* lowClassBreak = [AGSClassBreak
                                    classBreakInfoWithSymbol:lowSymbol forMinValue:DBL_MIN
                                    maxValue:50000.0];
    
    AGSClassBreak* mediumClassBreak = [AGSClassBreak
                                       classBreakInfoWithSymbol:mediumSymbol forMinValue:50000.0
                                       maxValue:250000];
    
    AGSClassBreak* highClassBreak = [AGSClassBreak
                                     classBreakInfoWithSymbol:highSymbol forMinValue:250000.0
                                     maxValue:DBL_MAX];
    
    // Create an NSMutableArray, fill it with the class break objects,
    // and set it to the renderer’s classBreaks property
    cityRenderer.classBreaks = [NSMutableArray arrayWithObjects:
                                lowClassBreak, mediumClassBreak, highClassBreak, nil];
    
    // Add the renderer to the graphics layer
    self.cityGraphicsLayer.renderer = cityRenderer;
    
    // Add the graphics layer to the map view
    [self.mapView addMapLayer:self.cityGraphicsLayer withName:@"CityGraphicsLayer"];
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return YES;
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
    self.cityGraphicsLayer = nil;
    self.mapView = nil;
    [super viewDidUnload];
}

- (void)dealloc {
    [cityGraphicsLayer release];
    [mapView release];
    [super dealloc];
}

#pragma mark AGSMapViewDelegate

// Called when the map view is loaded (after the view is loaded) 
- (void)mapViewDidLoad:(AGSMapView *)mapView {
        
    // Set up query task for cities and perform query returning all attributes
    self.cityQueryTask = [AGSQueryTask queryTaskWithURL:[NSURL URLWithString:kDynamicMapServiceURL]];
    self.cityQueryTask.delegate = self;
    
    AGSQuery *cityQuery = [AGSQuery query];
    cityQuery.where = @"STATE_NAME = 'California'";
    cityQuery.outFields = [NSArray arrayWithObject:@"*"];
        
    [self.cityQueryTask executeWithQuery:cityQuery];
    
    // Create extent to be used as default
    AGSEnvelope *envelope = [AGSEnvelope envelopeWithXmin:-118.6
                                                     ymin:33.6
                                                     xmax:-118.1
                                                     ymax:34.2
                                         spatialReference:self.mapView.spatialReference];
    
    // Call method to set extent, pass in envelope
    [self.mapView performSelector:@selector(zoomToEnvelope:animated:) 
                       withObject:envelope
                       afterDelay:0.5];    
}    

#pragma mark AGSQueryTaskDelegate

// When query is executed ....
- (void)queryTask:(AGSQueryTask *)queryTask didExecuteWithFeatureSetResult:(AGSFeatureSet *)featureSet {
    // Iterate the returned features (graphics) and add them to the graphics layer
    for (AGSGraphic *graphic in featureSet.features) {
        [self.cityGraphicsLayer addGraphic:graphic];
    }
    [self.cityGraphicsLayer dataChanged];
    
    // Clean up query task memory
    self.cityQueryTask = nil;
}

// If there's an error with the query task give info to user
- (void)queryTask:(AGSQueryTask *)queryTask didFailWithError:(NSError *)error {
    // Clean up query task memory
    self.cityQueryTask = nil;

    // Display error message
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                    message:[error localizedDescription]
                                                   delegate:nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];
    [alert release];
}

@end

Summary

In this post you learned how to use a Class Breaks Renderer in the ESRI ArcGIS iPhone API to display cities of varying population with different symbols.

Click here to download the source code from this article.

I hope you are finding these posts on the ESRI iPhone API to be helpful. If you have any suggestions, ideas or feedback, please leave them in the comments below.

Additional Resources

Tags: , , ,

ArcGIS Server | ESRI | iPhone | Mobile

ESRI ArcGIS iPhone API – Integration with Core Location

by James Richards May 14, 2010

Introduction

Last week I started to familiarize myself with the ESRI ArcGIS iPhone API public beta and I blogged about my First Impressions. This week I had a chance to play around with it some more and I decided to investigate working with location. I enhanced my sample application from last week to include a Location button, which when pressed zooms the map to the current location and displays a custom push pin graphic.

Screen1     Screen2

Click here to download the source code from this article.

There are two ways you can work with location while writing an app with ESRI’s iPhone API:

ESRI’s AGSGPS class provides a convenient wrapper around Core Location if you don’t want (or need) to delve into the details of the framework.

[more]

ESRI AGSGPS Class vs. Apple Core Location Framework

Here’s how the ESRI iPhone API documentation describes the AGSGPS class:

“This object controls how the map responds to GPS input. To make the map start responding to GPS input, call the start method. The map will automatically zoom to the first location specified by the GPS input. You can control the zoom level by specifying the zoomLevel property. If the autoPan property is enabled, the map will recenter everytime a new GPS location is received. To make the map stop responding to GPS input, call the stop method. By default, the map uses a round, blue symbol to display the current location. You can replace this symbol with an image icon of your choice. This image must be included in the application bundle, it must be named GpsDisplay.png and it must be 35x35 pixels in size.”

The class definitely simplifies working with Core Location, but the trade off is that you are somewhat limited in what you can do. For example, Core Location includes the CLLocationManagerDelegate protocol which is “used to receive location and heading updates” so you can respond to them in your code. I’d like to see something similar in the ESRI iPhone SDK to give us more flexibility to respond to location updates. With the ESRI iPhone SDK, you just turn on the GPS and let the map do it’s thing.

For my sample app, I decided to work with the Core Location framework for finer grained control over the user interaction.

Implementation Details

The first step I took was to rearrange the UI in Interface Builder to accommodate the new button. I decided to add a proper toolbar along the bottom and center the new button and existing segment control. This required adding Flexible Bar Button Items on each side of the toolbar, as shown:

Finding the proper icon for the Location button was a bit tricky. Interface Builder doesn’t give you a way to specify this particular system icon for your button. I had to follow Diallo’s advice from this Stack Overflow question to get the icon from the UI Kit and save it to disk. I temporarily added this code to the viewDidLoad event, and ran the application once to write the icon out to my document directory.

UIImage* img = [UIImage kitImageNamed:@"UIButtonBarLocate.png"];
// Get the location of the Documents directory NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ; NSString *imagePath = [paths objectAtIndex:0] ; NSString *filename = @"Locate.png" ; NSString *filepath = [NSString stringWithFormat:@"%@/%@", imagePath, filename] ; // Save the image NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(img)]; [imageData writeToFile:filepath atomically:YES];

If your not sure where the file gets saved, you can add an NSLog call to output imagePath to the Console. After the icon was saved, I removed the temporary code and copied the icon into the project directory, under the Resources group.

Once I had the view setup properly in interface builder, I modified the view controller’s header file to:

  • Import Core Location
  • Conform to the CLLocationManagerDelegate protocol
  • Declare members and properties for the location manager and locate button
  • Declare an IBAction method to run when the user clicks the locate button

I also cleaned up the previous week’s code a bit, to remove unnecessary AGSTiledMapServiceLayer members and properties.

Here is the new version of MyFirstMapAppViewController.h:

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import "AGSiPhone.h"

#define kTiledStreetMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"
#define kTiledImageryMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer"
#define kTiledReliefMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_ShadedRelief_World_2D/MapServer"

@interface MyFirstMapAppViewController : UIViewController<AGSMapViewDelegate, CLLocationManagerDelegate> {
    AGSMapView *mapView;
    CLLocationManager *locationManager;
    
    UIView *streetView;    
    UIView *imageryView;    
    UIView *reliefView;
    
    UIBarButtonItem *locateButton;
}

@property (nonatomic, retain) IBOutlet AGSMapView *mapView;
@property (nonatomic, retain) CLLocationManager *locationManager;

@property (nonatomic, retain) UIView *streetView;
@property (nonatomic, retain) UIView *imageryView;
@property (nonatomic, retain) UIView *reliefView;

@property (nonatomic, retain) IBOutlet UIBarButtonItem *locateButton;

- (IBAction)toggleLayer:(id)sender;
- (IBAction)showLocation:(id)sender;

@end

For the implementation file, Core Location is used in the following manner:

  • The location manager is created and started in viewWillAppear
  • The locate button is disabled in viewWillAppear to ensure that the button can’t be used until Core Location services have become available
  • A new graphics layer is created and added to the map in viewDidLoad
  • The location button is enabled in the location manager’s didUpdateToLocation event once core location is started and ready to use
  • When the user touches the Locate button, the showLocation method gets the location, creates and zooms to an envelope around that location, and displays a push pin graphic in the graphics layer
  • The location manager is shut down in viewWillDisappear

This code follows the same basic pattern shown in one of the examples in Head First iPhone Development.

Here is the MyFirstMapAppViewController.m file:

#import "MyFirstMapAppViewController.h"

@implementation MyFirstMapAppViewController

@synthesize mapView;
@synthesize streetView;
@synthesize imageryView;
@synthesize reliefView;
@synthesize locationManager;
@synthesize locateButton;

- (void)viewWillAppear:(BOOL)animated {
    // Setup location manager
    NSLog(@"Starting core location");
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    self.locationManager.delegate = self;
    [self.locationManager startUpdatingLocation];
    self.locateButton.enabled = NO;
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.mapView.mapViewDelegate = self;
    
    AGSTiledMapServiceLayer *streetLayer = [[AGSTiledMapServiceLayer alloc] 
                                            initWithURL:[NSURL URLWithString:kTiledStreetMapServiceURL]];
    self.streetView = [self.mapView addMapLayer:streetLayer withName:@"Street"];
    [streetLayer release];
    
    AGSTiledMapServiceLayer *imageryLayer = [[AGSTiledMapServiceLayer alloc] 
                                             initWithURL:[NSURL URLWithString:kTiledImageryMapServiceURL]];
    self.imageryView = [self.mapView addMapLayer:imageryLayer withName:@"Imagery"];
    [imageryLayer release];
    
    AGSTiledMapServiceLayer *reliefLayer = [[AGSTiledMapServiceLayer alloc] 
                                            initWithURL:[NSURL URLWithString:kTiledReliefMapServiceURL]];
    self.reliefView = [self.mapView addMapLayer:reliefLayer withName:@"Relief"];
    [reliefLayer release];

    self.streetView.hidden = NO;
    self.imageryView.hidden = YES;
    self.reliefView.hidden = YES;

    // Create a graphics layer to display the push pin
    AGSGraphicsLayer *graphicsLayer = [AGSGraphicsLayer graphicsLayer];
    [self.mapView addMapLayer:graphicsLayer withName:@"GraphicsLayer"];
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return YES;
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void) viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    NSLog(@"Shutting down core location");
    [self.locationManager stopUpdatingLocation];
    self.locationManager = nil;
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)dealloc {
    self.mapView = nil;
    self.streetView = nil;
    self.imageryView = nil;
    self.reliefView = nil;
    
    [locateButton release];
    [super dealloc];
}

- (IBAction)toggleLayer:(id)sender {
    
    self.streetView.hidden = (((UISegmentedControl *)sender).selectedSegmentIndex != 0);
    self.imageryView.hidden = (((UISegmentedControl *)sender).selectedSegmentIndex != 1);
    self.reliefView.hidden = (((UISegmentedControl *)sender).selectedSegmentIndex != 2);    
}

- (IBAction)showLocation:(id)sender {
    NSLog(@"Show Location");
    
    CLLocation *location = self.locationManager.location;
    double lat = location.coordinate.latitude;
    double lon = location.coordinate.longitude;
    NSLog(@"%.3f, %.3f", lat, lon);
    
    double size = 0.05;
    AGSEnvelope *envelope = [AGSEnvelope envelopeWithXmin:lon - size 
                                                     ymin:lat - size
                                                     xmax:lon + size 
                                                     ymax:lat + size
                                         spatialReference:self.mapView.spatialReference];
    [self.mapView zoomToEnvelope:envelope animated:YES];
    
    // Get reference to the graphics layer
    id<AGSLayerView> graphicsLayerView = [self.mapView.mapLayerViews objectForKey:@"GraphicsLayer"];
    AGSGraphicsLayer *graphicsLayer = (AGSGraphicsLayer*)graphicsLayerView.agsLayer;
    
    // Clear graphics
    [graphicsLayer removeAllGraphics];
    
    // Create a marker symbol using the Location.png graphic
    AGSPictureMarkerSymbol *markerSymbol = [AGSPictureMarkerSymbol pictureMarkerSymbolWithImageNamed:@"Location.png"];
    
    // Create a new graphic using the location and marker symbol
    AGSGraphic* graphic = [AGSGraphic graphicWithGeometry:[envelope center]
                                                   symbol:markerSymbol
                                               attributes:nil
                                             infoTemplate:nil];
    
    // Add the graphic to the graphics layer
    [graphicsLayer addGraphic:graphic];
}

- (void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    NSLog(@"Core location has a new position");
    self.locateButton.enabled = YES;
}

- (void) locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"Core location failed to get position");
    self.locateButton.enabled = NO;
}

#pragma mark AGSMapViewDelegate

//called when the map view is loaded (after the view is loaded) 
- (void)mapViewDidLoad:(AGSMapView *)mapView {
    
    //create extent to be used as default
    AGSEnvelope *envelope = [AGSEnvelope envelopeWithXmin:-124.83145667
                                                     ymin:30.49849464
                                                     xmax:-113.91375495
                                                     ymax:44.69150688
                                         spatialReference:mapView.spatialReference];
    
    //call method to set extent, pass in envelope
    [self.mapView performSelector:@selector(zoomToEnvelope:animated:) 
                       withObject:envelope
                       afterDelay:0.5];
}    

@end

Summary

In this post we looked at some options for utilizing Core Location with the ESRI ArcGIS iPhone API. ESRI’s AGSGPS class provides an easy to use convenience wrapper around Core Location, but it is not as flexible as working directly with Apple’s Core Location framework. An example was presented that demonstrates how to work with the Core Location framework and ESRI’s iPhone API. The example showed how to get the current location and zoom to it while showing a custom graphic on the map.

Click here to download the source code from this article.

I’m having a lot of fun learning about iPhone programming and ESRI’s iPhone API. I addition to testing in the simulator, I signed up for the Apple Developer Program so I can now run these apps on my iPod Touch. (The Mac Mini in the background is my dev box!)

iPodTouch

I hope you are enjoying these posts and finding the information helpful. If you have any suggestions, ideas or feedback, please leave them in the comments below.

Additional Resources

Tags: , , , ,

ArcGIS Server | ESRI | iPhone | Mobile

ESRI ArcGIS iPhone API – First Impressions

by James Richards May 04, 2010

The ESRI ArcGIS iPhone API was released to public beta today. Jeff Shaner blogged and tweeted about it this morning.

I downloaded the SDK this afternoon and took it for a spin. My first impressions are very favorable. Although the documentation is still a bit sparse in a few places, that’s to be expected for a first beta.

The SDK is another client API for consuming ArcGIS Server REST endpoints, and it works with versions 9.3.1 and 10.0. If you have worked with any of the other client APIs, you will already be familiar with the basic paradigm of interaction with the various REST services offered by ArcGIS Server.

The SDK Concepts Documentation provides a basic overview of the technology and includes a number of brief walkthroughs as well as short code samples illustrating how to perform common programming tasks with the API.

The installation also includes six sample applications which are installed into your ~/Library/SDKs/Samples folder. Studying these sample apps is a good way to jumpstart your familiarity with the API.

But enough talk already, let’s see some code! [more]

After following the My First iPhone Application tutorial,  I decided to jump in and modify the application to improve it in a some specific ways:

  • Add a button bar to toggle three base map types: Streets, Aerial Imagery, and Shaded Relief Map
  • Zoom to a predefined initial extent on application startup
  • Support any device rotation

I won’t spend a lot of time describing everything here. I’ll just show a few screen snapshots with the source code and make everything available for download.

Here are some screen snapshots of the app running in the simulator:

StreetView     ImageryView     ReliefView

Rotated

Here is the MyFirstMapAppViewController.h header file:

#import <UIKit/UIKit.h>
#import "AGSiPhone.h"

#define kTiledStreetMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"
#define kTiledImageryMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer"
#define kTiledReliefMapServiceURL @"http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_ShadedRelief_World_2D/MapServer"

@interface MyFirstMapAppViewController : UIViewController<AGSMapViewDelegate> {
    AGSMapView *_mapView;
    
    UIView *_streetView;
    AGSTiledMapServiceLayer *_streetLayer;
    
    UIView *_imageryView;
    AGSTiledMapServiceLayer *_imageryLayer;

    UIView *_reliefView;
    AGSTiledMapServiceLayer *_reliefLayer;
    
}

@property (nonatomic, retain) IBOutlet AGSMapView *mapView;

@property (nonatomic, retain) UIView *streetView;
@property (nonatomic, retain) AGSTiledMapServiceLayer *streetLayer;

@property (nonatomic, retain) UIView *imageryView;
@property (nonatomic, retain) AGSTiledMapServiceLayer *imageryLayer;

@property (nonatomic, retain) UIView *reliefView;
@property (nonatomic, retain) AGSTiledMapServiceLayer *reliefLayer;

- (IBAction)toggleLayer:(id)sender;

@end

(Sorry, this is my first post about iPhone programming and I haven’t figured out how to highlight the syntax for Objective-C yet!)

And here is the MyFirstMapAppViewController.m implementation file:

#import "MyFirstMapAppViewController.h"

@implementation MyFirstMapAppViewController

@synthesize mapView = _mapView;
@synthesize streetView = _streetView;
@synthesize streetLayer = _streetLayer;
@synthesize imageryView = _imageryView;
@synthesize imageryLayer = _imageryLayer;
@synthesize reliefView = _reliefView;
@synthesize reliefLayer = _reliefLayer;

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.mapView.mapViewDelegate = self;
    
    self.streetLayer = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:[NSURL URLWithString:kTiledStreetMapServiceURL]];
    self.streetView = [self.mapView addMapLayer:self.streetLayer withName:@"Street"];
    self.streetView.hidden = NO;

    self.imageryLayer = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:[NSURL URLWithString:kTiledImageryMapServiceURL]];
    self.imageryView = [self.mapView addMapLayer:self.imageryLayer withName:@"Imagery"];
    self.imageryView.hidden = YES;

    self.reliefLayer = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:[NSURL URLWithString:kTiledReliefMapServiceURL]];
    self.reliefView = [self.mapView addMapLayer:self.reliefLayer withName:@"Relief"];
    self.reliefView.hidden = YES;
        
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return YES;
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)dealloc {
    self.mapView = nil;
    self.streetView = nil;
    self.streetLayer = nil;
    self.imageryView = nil;
    self.imageryLayer = nil;
    self.reliefView = nil;
    self.reliefLayer = nil;
    
    [super dealloc];
}

- (IBAction)toggleLayer:(id)sender {
    
    self.streetView.hidden = (((UISegmentedControl *)sender).selectedSegmentIndex != 0);
    self.imageryView.hidden = (((UISegmentedControl *)sender).selectedSegmentIndex != 1);
    self.reliefView.hidden = (((UISegmentedControl *)sender).selectedSegmentIndex != 2);    
}

#pragma mark AGSMapViewDelegate

//called when the map view is loaded (after the view is loaded) 
- (void)mapViewDidLoad:(AGSMapView *)mapView {
    
    //create extent to be used as default
    AGSEnvelope *envelope = [AGSEnvelope envelopeWithXmin:-124.83145667
                                                     ymin:30.49849464
                                                     xmax:-113.91375495
                                                     ymax:44.69150688
                                         spatialReference:mapView.spatialReference];
    
    //call method to set extent, pass in envelope
    [self.mapView performSelector:@selector(zoomToEnvelope:animated:) 
                       withObject:envelope
                       afterDelay:0.5];
}    

@end

There are a couple of points to note about how things are wired up in Interface Builder.

The UISegmentedControl’s Value Changed event is hooked up to the File’s Owner’s toggleLayer function.

IB1

And the UISegmentedControl’s Autosizing is set to bottom center. By configuring the control this way in Interface Builder, we do not need to write any code to handle placement of the UISegmentedControl when the view rotates.

IB2

Summary

Well, that about covers everything for my first experience with the ESRI iPhone SDK. All in all, I’d say it looks like another great client API for use with ArcGIS Server. For those of us who have been wanting to create native iPhone apps on the ESRI stack, the wait is over!

I hope you enjoyed this brief tour of ESRI’s latest offering.

Click here to download the source code from this article.

Additional Resources

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ArcGIS Server | ESRI | Mobile | iPhone

My Favorite Tweets from the ESRI BPC / Devsummit - Day 5

by James Richards March 25, 2010

Presenting the final day of my favorite tweets from the ESRI Business Partners Conference / Developer Summit. Many thanks to all the Tweeps who kept the rest of us informed. I hope my small role of documenting my favorites has helped a few others.

  • http://twitpic.com/1atozp - Empty halls at #devsummit. Guess the party last night was a success. #earlybirdsession - via @martenhogeweg
  • #MVC, test-driven development & #IOC shown with #Cairngorm 3 #devsummit #flex #as3 - via @dafkobyte
  • Extending the tiledmapservicelayer in silverlight with @rex_hansen using openstreetmap. Very cool. #devsummit - via @vtforester
  • @SharpGIS Dissin' the Flex folks. Too funny. I'm thinking Dodgeball game...flex team vs silverlight team. #devsummit - via @vtforester
  • Yay Jeremy! "Don't put ArcMap inside firefox" #devsummit #usability - via @bnoyle
  • For those interested in JS API 2 public beta...you need to get the bits from ESRI blogs. not integrated into resource centers yet #devsummit - via @bnoyle
  • Idea for next #DevSummit - API team should show nice, well designed workflow apps, and then go through how to build'em and release src - via @dbouwman
  • heard some people wondering what happened to gdb versioning. indeed no talk by ESRI at #devsummit -all web editing going directly to the gdb - via @oseidel
  • New Geolocator stuff is impressive. Configurable, Grammar-based with a plugin model.  Unicode/internationalised. Total rewrite. #DevSummit - via @geeknixta
  • Learn more about the forthcoming #ESRI ArcGIS Explorer Online from these #devsummit videos: http://bit.ly/bQ6mYW - via @bernszukalski
  • ArcGIS 10 Final release in June #devsummit - via @RealIdahoBoy
  • arcgis 10 prerelease available for all EDN #devsummit - via @Gazymodo
  • Everyone heard, ezre said Fedora 12 support on its way. #devsummit - via @cageyjames
  • @cageyjames fedora not at 10, that is post 10 #devsummit - via @spangrud
  • Arcgisserver 10 to get openid support in the future! #devsummit - via @RealIdahoBoy
  • #ArcGIS SDK for #iPhone: map layers, overlay graphics, search/id, locate address, collect data & tasks. #devsummit - via @dafkobyte
  • Disappointed that feature service web editing is only supported using SDE. Small-ish shops could really benefit from this. #devsummit - via @BrightRain
  • Last day of #devsummit. Thanks to everyone at #ESRI and I look forward to seeing you all next year. - via @calvinit21
  • at Palm Springs airport. goodbye #devsummit - via @Gazymodo

For newcomers to the series, here are my day 1, day 2day 3 and day 4 favorites.

Enjoy!

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ESRI

My Favorite Tweets from the ESRI BPC / Devsummit - Day 4

by James Richards March 24, 2010

Presenting day 4 of my favorite tweets from the ESRI Business Partners Conference / Developer Summit. A lot more tweets coming through today with the #devsummit hash tag than there were the first two days with the #esri_bpc hash tag. My unscientific conclusion is that developers use Twitter more than business types.

  • @trbaker Where are your #Twitter followers? GeoTweeters: http://bit.ly/lscto #devsummit #gis #socialnetworking - via @geoinformacao
  • Sweet! We wom the mashup challenge! Plus big shout out to @dbouwman from #esri #devsummit - via @bnoyle
  • #ESRI #mashup challenge winners now online at http://bit.ly/5jG8Dz #DevSummit #esridevsummit - via @giseducation
  • Recently "mashup," now "cloud." Keywords we get to listen to for a while. #devsummit - via @RealIdahoBoy
  • David Chappell: "Startups love cloud platforms. They allow startups to fail fast and cheaply (or even free)." #devsummit - via @ChrisSpagnuolo
  • Hopefully Chappell will show how expensive windows azure is. #devsummit - via @cageyjames
  • #esri story on cloud computing is good, but still need more info on cost/time to scale and a move away from ELA only needed #devsummit - via @bnoyle
  • Spatial data stored in user tables, can be accessed via SQL #devsummit - via @TrippingTheBits
  • It is odd to me tho that complex maps perform better using SHP in AGS. #devsummit - via @kirrilian
  • The Flex editor is nice, but worry some will forget to use tools in the context of a workflow. Don't re-create ArcEditor in Flex! #DevSummit - via @dbouwman
  • New to ArcGIS 10: Query Layers = layers based on real SQL queries! #devsummit - via @TrippingTheBits
  • Sounds like FGDB API is still a ways off #devsummit - via @cageyjames
  • No support for Annotation, Relationships, Networks, Topologies, Representations, Terrains and Parcel Fabrics in FGDB API #devsummit - via @cageyjames
  • Sweet. Ed architecting a SQL compatible geocode soln. Off the cuff in response to question #devsummit - via @bnoyle
  • Browser usage in demos: Firefox = most, Chrome = a couple, IE = NONE. #devsummit - via @gadtweet
  • REST extension URLs: /serverUrl/exts/extName/extMethod #devsummit - via @TrippingTheBits
  • Woah, add AGS Inet connection to ArcMap, right-click, choose Edit Features, makes local copy, sync back to db #devsummit - via @TrippingTheBits
  • #devsummit ver 2 of esri #silverlight API built on #VS2010 and #SL4. New widgets for editing,time,and feature data editing in toolkit. - via @cfemmer
  • #devsummit @SharpGIS is spreading the #SL goodness. woot for binding and commanding! - via @jrockers
  • Playing with ArcGIS Explorer sdk...pretty awesome! A lot more control than I expected! #devsummit - via @NateStrout
  • iPhone SDK for AGS Server interesting. If only I had a Mac for development.... #devsummit - via @northpointgis
  • MS Surface demo, picking AGOL sources and dropping onto a map is slick! #DevSummit - via @geeknixta
  • #devsummit Iphone SDK will work with iPad and iTouch too. SDK assumes always on connection. - via @jshek

For newcomers to the series, here are my day 1, day 2 and day 3 favorites.

Enjoy!

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ESRI

My Favorite Tweets from the ESRI BPC / Devsummit - Day 3

by James Richards March 23, 2010

Presenting day 3 of my favorite tweets from the ESRI Business Partners Conference / Developer Summit. I missed most of the morning due to being on a client site. But here are my faves from the afternoon.

  • @MapsRus I was in the Server session at the #ESRI_BPC - Nothing new in ADF for 10 . Only bug fixes. All but dead. #webADF #DevSummit - via @dbouwman
  • REST Server Object Extension sounds easy, implement the two method IRESTRequestHandler #devsummit - via @TrippingTheBits
  • At desktop add-in session at #devsummit. No more COM wireup with extensions. Fantastic! - via @BrightRain
  • #devsummit @ajhaddad just said three very exciting letters, "MEF" - via @jrockers
  • @rex_hansen showing us how to use Expression Blend to make a Silverlight app. Great starter session. API is nicely integrated. #DevSummit - via @geeknixta
  • At the Silverlight WPF session where Rex @rexhansen is showing the real power of Binding #devsummit - via @alpascual
  • @dbouwman just called me a troublemaker in his presentation. #sweet #devsummit - via @cageyjames
  • ArcGIS for Silverlight API 2.0 public beta coming in April. Supporting VS2010, Expression Blend 4, Silverlight 4, .NET 3.5 & 4. #DevSummit - via @geeknixta
  • Wow. Presenter says "filegdb faster on linux than sde". Goes against everything esri has said for years. #devsummit - via @geodatabase 
  • Videos of the #ESRI_BPC demos are now available. The ArcGIS Server on Amazon demo will be posted tomorrow. http://is.gd/aUZcV - via @ESRI_BPC
  • Where are the Avenue sessions? #devsummit - via @odoenet

Not too many tweets using the #esri_bpc hash tag any more. Most tweeps have moved over to #devsummit.

For newcomers to the series, here are my day 1 and day 2 favorites.

Enjoy!

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ESRI

My Favorite Tweets from the ESRI BPC / Devsummit - Day 2

by James Richards March 22, 2010

Presenting day 2 of my favorite tweets from the ESRI Business Partners Conference / Developer Summit:

  • There will be a new workspace type in 10 - "SQL Workspace" for direct SQL queries (spatial/nonspatial) #devsummit - via @eriknybergNET
  • ArcGIS.com will be a great resource for #maps #WebApps #mobileApps and tools. #esri_bpc - via @cmcginty
  • Like the features of ArcGIS.com that allow you to share with everyone or by limiting to groups. Very useful for info prep. #esri_bpc - via @cmcginty
  • @mraad shows usage of local Shapefiles, and collaborative web map editing environment. #webmap #devsummit - via @dafkobyte
  • ArcGIS JavaScript API 2.0 public beta made available today http://tinyurl.com/yez986j #ESRI #devsummit - via @SterlingGIS
  • AGS 10 (JavaScript 2.0 API) looks great- editing and temporal data display. Nice to see all those oil & gas well app samples. #devsummit - via @dropstones
  • New AGS 'FeatureServer' will allow for feature insert & update via REST & SOAP APIs #devsummit - via @TrippingTheBits
  • Android sdk will be next big push after Arc10 release #Esri_bpc #devsummit - via @mapitout
  • details being presented on new ESRI certification program #ESRI_BPC - via @DaleLoberger
  • You know you're a bit of a nerd when you pick up a Spock bobblehead. #devsummit #swag - via @adamjpfister

Tweets seemed to peter out around 4pm today. I guess everyone was hitting the bar by then...

For newcomers to the series, day 1 favorites are here.

Enjoy!

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ESRI | Planet GS

My Favorite Tweets from the ESRI BPC / Devsummit - Day 1

by James Richards March 21, 2010

For those of you (like me) who couldn't make it to the ESRI Business Partner Conference / Developer Summit, you can follow the action on Twitter with the hash code #esri_bpc. You should also keep an eye on #devsummit since @dbouwman seems to have an aversion to typing underscores.

Here are a few of my favorite tweets from day 1:

  • #esri_bpc: Where ESRI decides when and how to eat its offspring. - via @howardbutler
  • 4min to have AGS set-up in the cloud? Wow! That should drop some billable hours... #esri_bpc - via @spanaut
  • ArcGIS in the Amazon cloud will work just like any other platform - except for the loading tons of data ;-) #esri_bpc - via @cmcginty
  • Dear ESRI, stop saying it takes 4 min to set up ArcGIS on AWS. #false #esri_bpc - via @cageyjames
  • Both an iPhone app for ArcGIS and an iPhone SDK will be available with ArcGIS 10 #ESRI_BPC - via @jeroenvanwinden
  • No support for legend /toc in rest api at 10... This is a GOOD thing! #devsummit - via @dbouwman
  • Just had demo of SQL Azure Spatial from Spatial Ed at #esri_bpc -- impressive. See Ed's blog http://bit.ly/bbNDoE + #FME just *works* on it - via @DaleAtSafe
  • @ESRI should be paying @dbouwman & @cageyjames some coin for their coverage of AGS10 at #DevSummit. <foil hat on> - via @tokumin
  • As compelling at this session is, I'm gonna install v10 beta on my laptop... #multi-tasking #DevSummit - via @dbouwman

Enjoy!

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ESRI | Planet GS

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James Richards

Hi, I'm James Richards the CTO and co-founder of Artisan Global LLC. We make location-aware mobile apps with maps. I'm the author of QuakeFeed and I helped launch Zaarly at LASW Feb 2011. I also enjoy surfing, snowboarding, golfing, yoga, and music. I love my family: Linda, Sequoya and our cats Remy and Twiggy. Thanks for stopping by, I hope you find something helpful here.

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