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    NSError * error;
    
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&error];
    if(error)
        NSLog(@"Failed to set category to the AVAudioSession : %@", [error localizedDescription]);
    
    NSURL * musicURL = [[NSBundle mainBundle] URLForResource:@"music_file_name" withExtension:@"mp3"];
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:&error];
    if(error)
        NSLog(@"Failed to play AVAudioSession : %@", [error localizedDescription]);

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    NSURL * url = [[NSBundle mainBundle] URLForResource:@"video_file_name" withExtension:@"mov"];
    MPMoviePlayerViewController * vc = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
    vc.moviePlayer.controlStyle = MPMovieControlStyleFullscreen;
    [self presentMoviePlayerViewControllerAnimated:vc];

yfujiki

- (NSMutableDictionary *) mutableDeepCopy {
    NSMutableDictionary * returnDict = [[NSMutableDictionary alloc] initWithCapacity:self.count];
    NSArray * keys = [self allKeys];

    for(id key in keys) {
        id oneValue = [self objectForKey:key];
        id oneCopy = nil;

        if([oneValue respondsToSelector:@selector(mutableDeepCopy)]) {
            oneCopy = [oneValue mutableDeepCopy];

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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);        
NSString *documentsDirectory = [paths objectAtIndex:0];

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MKZoomScale currentZoomScale = map.bounds.size.width / map.visibleMapRect.size.width;
                

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UIView * view = ...
    
view.layer.borderColor = color.CGColor;
view.layer.borderWidth = width;

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UIView * view = ...

view.layer.masksToBounds = YES;
view.layer.cornerRadius = width;

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UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)];
textField.leftView = paddingView;
textField.leftViewMode = UITextFieldViewModeAlways;

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- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{
    if(scrollView == _scrollView && view == _contentView)
    {
        // Setting ivars for scrollViewDidZoom
        _contentOffsetBeforeZoom = _scrollView.contentOffset;
        _scrollViewBoundsBeforeZoom = _scrollView.bounds;
    }
}

yfujiki

yourView.layer.shadowColor = [[UIColor blackColor] CGColor];
yourView.layer.shadowOffset = CGSizeMake(10.0f, 10.0f);
yourView.layer.shadowOpacity = 1.0f;
yourView.layer.shadowRadius = 10.0f;