How to get this value as a CGFloat?

Question

I am asking for an Value like this:

[self.layer valueForKeyPath:@"transform.rotation.z"]

bit I need to pass it to a method which takes a CGFloat as parameter. What's the casting trick here?

Answer 1

Try

NSNumber* n = [self.layer valueForKeyPath:@"transform.rotation.z"];
CGFloat f = [n floatValue];

Answer 2

If you wanted a more concise, one line way to do that, you can do:

CGFloat f = [[self.layer valueForKeyPath:@"transform.rotation.z"] floatValue];