Extension (in Swift) and Category (in Obj-C) on UIImage with function that returns image frame in UIImageView based on current content mode. Playgound to play around included.
Supports all UIView.ContentModes. Will return CGRect.zero if image is not same as image view image.
Swift:
let image = UIImage(named: "my-image")
let imageView = UIImageView(image: image)
let frame = image.frame(in: imageView)
Obj-C:
UIImage *image = [UIImage imageNamed:@"my-image"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
CGRect frame = [image frameInView:imageView];
