以下是将图片保存为PNG的代码。也可以保存为TIFF, BMP, GIF, JPEG格式。

 

NSData *data;

NSBitmapImageRep *bits = …; // get a rep from your image, or grab from a view
 data = [bits representationUsingType: NSPNGFileType properties: nil];
 

 atomically: NO];

[data writeToFile: @"/path/to/wherever/test.png"