Objective-C – Convert an image to icns

3 Solutions Collect From Internet About “Objective-C – Convert an image to icns”

Use CGImageSource APIs (e.g., CGImageSourceCreateWithURL, CGImageSourceCreateImageAtIndex) to load each image into a CGImageRef. Then use CGImageDestination APIs (e.g., CGImageDestinationCreateWithURL, CGImageDestinationAddImage, CGImageDestinationFinalize) to combine however many images you have into one icon file. The 3rd parameter of CGImageDestinationCreateWithURL would be kUTTypeAppleICNS.

1 Create a folder named icon.iconset.
2 Add one or more of the following images to the folder:

icon_16x16.png
icon_16x16@2x.png
icon_32x32.png
icon_32x32@2x.png
icon_128x128.png
icon_128x128@2x.png
icon_256x256.png
icon_256x256@2x.png
icon_512x512.png
icon_512x512@2x.png

3 Run this command and icon.icns will be created.

iconutil -c icns icon.iconset

http://developer.apple.com/library/mac/#documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Optimizing/Optimizing.html#//apple_ref/doc/uid/TP40012302-CH7-SW2

Save the NSImage which contains the icon as a TIFF file (use NSData* tiff = [image TIFFRepresentation]; to create a NSData with the TIFF file, and then just use [tiff writeToFile:tiffFile atomically:YES]; to save it in some folder), then use NSTask to convert the TIFF file to an ICNS file using tiff2icns.

tiff2icns /Users/Me/Desktop/pic.tiff /Users/Me/Desktop/pic.icns

Now, an example of the complete code (image is a NSImage file the icon, and iconFile is an NSString with the final location of the icns):

    NSString* tiffFile = [NSString stringWithFormat:@"%@.tiff",iconFile];

    NSData* tiff = [image TIFFRepresentation];
    [tiff writeToFile:tiffFile atomically:YES];

    NSTask *task = [[NSTask alloc] init];
    [task setLaunchPath:@"/usr/bin/tiff2icns"];

    [task setArguments:[NSArray arrayWithObjects:tiffFile, iconFile, nil]];
    [task launch];
    [task waitUntilExit];

    [[NSFileManager defaultManager] removeItemAtPath:tiffFile error: NULL];

And that’s it.