在super上调用协议方法

Question

Can I call a protocol method from a child on its super class, even though the super class supports the protocol privately?

Let's say I have a Class A which privately conforms to UIGestureRecognizerDelegate protocol. Class B inherits from Class A but when I tried to call [super gestureRecognizerShouldBegin:gestureRecognizer]; I get an error.

Any idea?

Answer 1

The UIScrollViewDelegate doesn't declare a method named gestureRecognizerShouldBegin:gestureRecognizer: .

But generally speaking, yes, its possible to call methods declared in protocols that the super class implements, but keep in mind that methods marked with @optional in the protocol aren't guaranteed to be implemented (you can check this via the respondsToSelector: method)