iOS - how to implement crop image like default photo album?

Question

The default crop function in iPhone photo album

Does any one know how to i

Answer 1

you can use this to crop the image.

CGRect rect = CGRectMake(some rect); 

CGImageRef imageRef = CGImageCreateWithImageInRect([urImageView.image CGImage], rect);
UIImage *cropedImage = [UIImage imageWithCGImage:imageRef];