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Is that an very cost-intensive function that sucky my performance away under my feet? I guess they used that one for the waggling buttons on the home screen + core animation. I just want to know before I start wasting my time 😉
Like with everything, it depends on how and how much you use it. It’s used all the time in game development, which the iPhone is very well suited for. CoreAnimation is also very fast. If you’re worried about it, my suggestion is to take one of the Apple-provided sample apps and run it through Instruments to preform some of your own benchmarks to see if they are acceptable for your needs.