Change animation time for properties of a CALayer

Question

I have a CALayer to animate a change in its image contents. Now, how can I change how long it takes for this animation to take place?

Answer 1

A different way to do this:

[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:2.5f] forKey:kCATransactionAnimationDuration];
//Perform CALayer actions, such as changing the layer contents, position, whatever.
aCALayerObject.contents = [self newCALayerContents];    
[CATransaction commit];

That code would animate the change of the CALayer's contents over 2.5 seconds. You can also use this to disable all animations completely. Like this:

[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];