method-swizzling

This question already has answers here : Swift 3.1 deprecates initialize(). How can I achieve the same thing? (9 answers) Swizzling in Swift 4 no longer works. Method 'initialize()' defines Objective-C class method 'initialize', which is not permitted by Swift This is something I have found a solution to so wanted to leave the questions and answer for others. initialize() is no longer exposed: Method 'initialize()' defines Objective-C class method 'initialize', which is not permitted by Swift So the way to do it now is to run your swizzle code via a public static method. e.g In the extension:

I try to figure out how things really work. So I thought when I would overwrite certain methods using categories, I would get interesting NSLogs. @implementation UIView(Learning) - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { NSLog(@"-hitTest:withEvent: event=%@", event); return [self hitTest:point withEvent:event]; } @end super and self don't work here. Is there a way to call the original implementation of -hitTest:withEvent:? What I want is an NSLog every time -hitTest:withEvent: is called on an UIView. It's just for personal learning purposes. I want to see the event