Fading Animation

gistfile1.txt

NSDictionary *fadeOutDict = [NSDictionary dictionaryWithObjectsAndKeys:_mainFeedViewController.view, NSViewAnimationTargetKey, NSViewAnimationFadeOutEffect, NSViewAnimationEffectKey, nil];

NSAnimation *animation = [[NSViewAnimation alloc] initWithViewAnimations:[NSArray arrayWithObjects:fadeOutDict, nil]];
[animation setDelegate:self];
[animation setFrameRate:60.0];
[animation setDuration:0.5f];
[animation setAnimationBlockingMode:NSAnimationBlocking];
[animation setAnimationCurve:NSAnimationEaseIn];
[animation startAnimation];
[animation release];