ObjectiveC CA Load image and with sprites

gistfile1

NSString *path = [[NSBundle mainBundle] pathForResource:@"yourImage.png" ofType:nil];
CGImageRef img = [UIImage imageWithContentsOfFile:path].CGImage;

CALayer *layer = [CALayer layer];
layer.contents = (id)img;
layer.bounds = CGRectMake( 0, 0, CGImageGetWidth(img), CGImageGetHeight(img) );


// with sprites atlasses
CALayer *layer = [CALayer layer];
layer.contents = (id)img;

CGSize size = CGSizeMake( 160, 198 ); // size in pixels of one frame
CGSize normalizedSize = CGSizeMake( size.width/CGImageGetWidth(img), size.height/CGImageGetHeight(img) );

layer.bounds = CGRectMake( 0, 0, size.width, size.height );
layer.contentsRect = CGRectMake( 0, 0, normalizedSize.width, normalizedSize.height );