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Month: December 2010

mbuzzy iPhone app

mbuzzy iPhone app

For the past couple of months, I’ve been working on an iPhone app for the social networking site: mbuzzy.com. It just went live into the App Store. Check it out: mbuzzy.app

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Three20: Uploading an image to a server

Here’s an example to upload an image (or any data file) to a server:

- (void) uploadMediaForUserId: (NSString*) userId {	
	NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjectsAndKeys:
								kAPIVersion, @"v",
								nil];
	// Media Name
	if( TTIsStringWithAnyText(_mediaName)){
		[parameters setObject:_mediaName forKey:@"n"]; 
	}
	
	// Media Description
	if( TTIsStringWithAnyText(_mediaDescription)){
		[parameters setObject:_mediaDescription forKey:@"d"]; 
	}
	
	// REST resource, where kMedia: @"/users/%@/media";
	NSString *resource = [NSString stringWithFormat:kMedia, userId];
	
	// Create the URL, where kServerURL is something like "http://www.dougdiego.com"
	NSString *url = [kServerURL stringByAppendingFormat:@"%@?%@", resource, [parameters gtm_httpArgumentsString]];
	// Resulting URL looks like: http://www.dougdiego.com/users/12345/media
	
	TTURLRequest* request = [TTURLRequest requestWithURL:url  delegate:self]; 
	request.httpMethod = @"POST"; 
		
	NSString * imageLocalUrl = [NSString stringWithFormat:@"documents://%@",_mediaFilename];
	NSData *imageData = UIImageJPEGRepresentation(TTIMAGE(imageLocalUrl), 0.6); 
	
	// Set the media file with the parameter: file
	[request addFile:imageData mimeType:@"image/jpeg"  fileName:@"file"]; 
	
	request.cachePolicy = TTURLRequestCachePolicyNoCache;
	request.cacheExpirationAge = TT_CACHE_EXPIRATION_AGE_NEVER;
	
	TTURLJSONResponse* response = [[TTURLJSONResponse alloc] init];
	request.response = response;
	TT_RELEASE_SAFELY(response);
	
	[request send]; 
}
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Three20: Swipe to delete

Need to implement Swipe to delete in your Three20 project? In order to do so, I added the 3 following methods to my datasource (TTListDataSource subclass):

- (BOOL) tableView: (UITableView *)tableView canEditRowAtIndexPath:  (NSIndexPath *)indexPath {
	return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
	[tableView beginUpdates];    
	if (editingStyle == UITableViewCellEditingStyleDelete) {	
        // Make sure the row is there to delete
		if([_myModel.messages count] >= indexPath.row){
            // Get the object to delete
			MyObject* myObject = [[_myModel.messages objectAtIndex:indexPath.row] retain];

           	// Remove the object, in my case this makes an API call
            [self removeObjectById: myobject.id];
                            
            // Remove the object from the array
			[_myModel.messages removeObjectAtIndex:indexPath.row];

			// clean up
			TT_RELEASE_SAFELY(myObject);
		}
        // Delete the row from the UITableView
		[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:YES];      
	}       
	[tableView endUpdates];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
	return [_myModel.messages count];
}

Note: before adding the numberOfRowsInSection method, I was getting NSInternalInconsistencyException errors.

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Targeting the iPhone 4

Are you releasing a flashlight app for the iPhone 4 or writing an application that use the capabilities of a certain device? Apple provides a UIKit Dictionary key called UIRequiredDeviceCapabilities for this purpose.

Apple define this key as: UIRequiredDeviceCapabilities (Array or Dictionary – iOS) lets iTunes and the App Store know which device-related features an application requires in order to run. iTunes and the mobile App Store use this list to prevent customers from installing applications on a device that does not support the listed capabilities.

You set this key in the Info.plist. Here is an example which tells the App Store that your app requires a camera flash. You can use this if your app only runs on the iPhone 4:

	<key>UIRequiredDeviceCapabilities</key>
	<array>
		<string>camera-flash</string>
	</array>

More: UIKit Keys

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iPhone Custom Fonts with FontLabel

Need to use your own custom font? Or you want to support a certain font that isn’t on older iPhonts? Check out the project FontLabel.

To use FontLabel:
1. Get a copy of the project: https://github.com/zynga/FontLabel.git

2. Add the files to your project:

3. Add a font file to your project. You can find several free fonts here: http://www.webpagepublicity.com/free-fonts.html

4. In your AppDelegate, add the import:

#import "FontManager.h"

And then load the font file in the didFinishLaunchingWithOptions:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
	// Load Custom Fonts
	[[FontManager sharedManager] loadFont:@"FuturaBoldBT"];
}

In my example, I used the font “FuturaBoldBT.ttf

5. Finally create a FontLabel, which is just a subclass of UILabel:

-(void) displayMyLabel {
        FontLabel * myLabel = [[FontLabel alloc] initWithFrame:CGRectMake(10, 30, 50, 30)
												fontName:@"FuturaBoldBT" pointSize:26.0f];
	myLabel.textAlignment = UITextAlignmentCenter;
	myLabell.textColor = UIColor.whiteColor;
	[myLabel setBackgroundColor:UIColor.clearColor];
	[self addSubview:myLabel];
}
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