Cocoa/Obj-C - TextField to clipboard button

- (IBAction)copyButton:(id)sender {
   NSPasteboard *pasteBoard = [NSPasteboard generalPasteboard];
   [pasteBoard declareTypes:[NSArray arrayWithObjects:NSStringPboardType, nil] owner:nil];
   [pasteBoard setString: [textField stringValue] forType:NSStringPboardType];
}