Create Notification Center Widget for iOS (Full Code).

#import "BBWeeAppController-Protocol.h"
#import <Twitter/Twitter.h>

/***
 TUTORIAL BY ANDY IBANEZ (@Leonnears).
 This is the tutorial I wrote about writing notification center widgets for iOS. You can find it on my tumblr blog (leonnears.tumblr.com).
 You can also follow me on Twitter (@Twitter) to receive updates when I write anything in my new blog, including when I post new tutorials and so on. I don't only tweet programming related stuff so don't follow me if you expect to only see programming or tech related stuff. ;)
 */

static NSBundle *_iNotitweetWeeAppBundle = nil;

@interface iNotitweetController: NSObject <BBWeeAppController> {
    UIView *_view;
    UIImageView *_backgroundView;
}
@property (nonatomic, retain) UIView *view;
@end

@implementation iNotitweetController
@synthesize view = _view;

+ (void)initialize {
    _iNotitweetWeeAppBundle = [[NSBundle bundleForClass:[self class]] retain];
}

- (id)init {
    if((self = [super init]) != nil) {

    } return self;
}

- (void)dealloc {
    [_view release];
    [_backgroundView release];
    [super dealloc];
}

- (void)loadFullView {
    // Add subviews to _backgroundView (or _view) here.
    UIButton *tweet = [UIButton buttonWithType:UIButtonTypeCustom];
    [tweet setBackgroundImage:[UIImage imageWithContentsOfFile:[_iNotitweetWeeAppBundle pathForResource:@"tweet" ofType:@"png"]] forState:UIControlStateNormal];
    tweet.frame = CGRectMake(2, 0, 79, 33);
    [tweet addTarget:self action:@selector(composeTweet) forControlEvents:UIControlEventTouchDown];
    [_view addSubview:tweet];
}

-(void)composeTweet {
    TWTweetComposeViewController *twtComposer = [[TWTweetComposeViewController alloc] init];
    UIViewController *someVc = [[UIViewController alloc] init];
    twtComposer.completionHandler = ^(TWTweetComposeViewControllerResult result)
    {
        if(result == TWTweetComposeViewControllerResultCancelled)
        {
            [someVc dismissModalViewControllerAnimated:YES];
        }
    };
    someVc.view = _view;
    [someVc presentModalViewController:twtComposer animated:YES];
    [someVc release];
    [twtComposer release];
}

- (void)loadPlaceholderView {
    // This should only be a placeholder - it should not connect to any servers or perform any intense
    // data loading operations.
    //
    // All widgets are 316 points wide. Image size calculations match those of the Stocks widget.
    _view = [[UIView alloc] initWithFrame:(CGRect){CGPointZero, {316.f, 33.f}}];
    _view.autoresizingMask = UIViewAutoresizingFlexibleWidth;

    UIImage *bgImg = [UIImage imageWithContentsOfFile:@"/System/Library/WeeAppPlugins/StocksWeeApp.bundle/WeeAppBackground.png"];
    UIImage *stretchableBgImg = [bgImg stretchableImageWithLeftCapWidth:floorf(bgImg.size.width / 2.f) topCapHeight:floorf(bgImg.size.height / 2.f)];
    _backgroundView = [[UIImageView alloc] initWithImage:stretchableBgImg];
    _backgroundView.frame = CGRectInset(_view.bounds, 2.f, 0.f);
    _backgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    [_view addSubview:_backgroundView];
}

- (void)unloadView {
    [_view release];
    _view = nil;
    [_backgroundView release];
    _backgroundView = nil;
    // Destroy any additional subviews you added here. Don't waste memory :(.
}

- (float)viewHeight {
    return 71.f;
}

@end