How to forbid copy or paste operation in NSTextField?

Question

As the title mentions. How can I forbid the copy (Command + C) and paste (Command + V) operations in an NSTextField or NSSecureTextField?

Answer 1

Create a subclass of UITextField. In that subclass, implement

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    if (sel_isEqual(action, @selector(copy:))) {
        return NO;
    }
    return [super canPerformAction:action withSender:sender];
}