Convert bitmap to PNG or JPG using Objective C

问题

Anyone knows how to convert a bitmap to PNG or JPG using Objective C assuming I have

CGImageRef imageRef;

回答1:

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

来源：https://stackoverflow.com/questions/1740691/convert-bitmap-to-png-or-jpg-using-objective-c