Retaining repeating NSTimer for later access?

Question

I am creating an NSTimer in the createTimer method that I want to refer back to in the later cancelTimer method. To facilitate this I am taking ownersh

Answer 1

You need to invalidate before you release. After the timer has fire, you are the only one holding a retain on the timer. So when you call release, the timer deallocates. You then call invalidate on invalid memory and you crash.