Convert a bitmap to PNG or JPG using Objective-C

Question

Does anyone know how to convert a bitmap to PNG or JPG using Objective-C, assuming I have

CGImageRef imageRef;

Answer 1

UIImage *myImage = [UIImage imageWithCGImage:imageRef];
NSData *pngData = UIImagePNGRepresentation(myImage);
NSData *jpgData = UIImageJPEGRepresentation(myImage);