How to Animate a UIBezierPath

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I am not an expert on CoreAnimation but you can define a CABasicAnimation as follows

CABasicAnimation *morph = [CABasicAnimation animationWithKeyPath:@"path"];
morph.duration = 5;
morph.toValue = (id) [self getTrianglePath];
[maskLayer addAnimation:morph forKey:nil];

The first line states that you want to define an animation that changes the path property of the layer. The second line states that the animation takes five seconds and the third line gives the final state of the animation. Finally, we add the animation to the layer. The key is a unique identifier for the animation, that is, if you add two animations with the same key only the last one is considered. This key can also be used to override so called implicit animations. There are a couple of properties of a CALayer that are animated by default. More precisely, if you change one of these properties the change will be animated with a duration of 0.25.

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