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Animating in Core Grapics Help.
I've been building a small game in Core Grapics and I can move around UIviews easy with a gameLoop and everything, but I don't know how to do scripted animations, besides block animations. How would I move a UIButton up 5 points and the bring it down 300 points when I click on it? And are there any good tutorials for core graphic animations.
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Anonymous Username
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You should use the Core Animation framework to animate properties on the layer. You can either subclass CALayer or use a delegate to do the actual drawing. In the drawing code, you can access the property that is being interpolated and use it to move points, change the thickness of lines, or anything else that Core Graphics lets you control. Look at this example code from Apple and see how it uses the lineWidth value that is being animated.
This little tutorial by John Blackburn is one of my favorite introductions to Core Animation. There are a few different concepts to grasp, but in general it's pretty simple to create quite complex animations.
Your problem with things running slower and slower most probably has nothing to do with Core Graphics. It could be that you are accidentally creating more and more timers for example.
Thanks :)
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