Question

How much memory alloc an UIImageView 320×480?

Answer 1

Normally a 320×480 UIView would consume an additional 320*480*4 bytes for the layer’s buffer, but in OS 3.0 UIImageView was optimized to use the source UIImage directly.

It has only a small overhead necessary to maintain the high-level UIView interface. To reduce this even further, you can create a CALayer and assign the contents directly:

CALayer *layer = [CALayer layer];
[layer setFrame:CGRectMake(0.0f, 0.0f, 320.0f, 480.0f)];
[layer setContents:(id)[image CGImage]];
[[superview layer] addSublayer:layer];