图像序列动画与核心动画

I'm currently using a UIImageView with an array of images to create a small looping animation sequence with about 20 images in there (at 320x480). Whilst this works okay for 20 - 30 images, any more and the app quits on the iphone. There is nothing else in my test app at the moment so I know it's just down to the animationImages sequence.I'm currently using a UIImageView with an array