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meiwin/gist:1815541

Created February 13, 2012 09:49
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CALayer animation (the correct way)
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gistfile1.m
// sample codes for animating calayer's opacity
CABasicAnimation * animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
animation.fromValue = [NSNumber numberWithValue:0];
animation.toValue = [NSNumber numberWithValue:1];
targetLayer.opacity = 1; // must be set, otherwise targetLayer opacity will not be updated, even after animation is completed.
[targetLayer addAnimation:animation forKey:@"opacity"]; // the key "opacity" must match keyPath being animated.
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