Create a UIImage from two other UIImages on the iPhone

Question

I\'m trying to write an animation on the iPhone, without much success, getting crashes and nothing seems to work.

What I wanna do appears simple, create a UIImage, a

Answer 1

I just want to add a comment about the answer above by dpjanes, because it is a good answer but will look blocky on iPhone 4 (with high resolution retina display), since "UIGraphicsGetImageFromCurrentImageContext()" does not render at the full resolution of an iPhone 4.

Use "...WithOptions()" instead. But since WithOptions is not available until iOS 4.0, you could weak link it (discussed here) then use the following code to only use the hires version if it is supported:

if (UIGraphicsBeginImageContextWithOptions != NULL) {
    UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
}
else {
    UIGraphicsBeginImageContext();
}