iOS, Android, Unity3D Education blog,
sample code:111_NSImage_save_File
NSBitmapImageRep *imgRep = [[self.m_imageview.image representations] objectAtIndex: 0];
NSData *data = [imgRep representationUsingType: NSPNGFileType properties: nil];
[data writeToFile: @"/Users/powenko/Desktop/file.png" atomically: NO];
Dr. Powen Ko is a teacher and CEO on LoopTek LLC, and like to teaching. if you need to class, please let PowenKo know, he will love to service and sharing. LoopTek web site is www.looptek.com