ARC: respondsToSelector Issue

Do either of the following.

[(NSObject*)self.delegate respondsToSelector:@selector(myClass:willDoSomething:)]

Or

@property (nonatomic, weak) NSObject<MyClassDelegate>* delegate;

Or

@protocol MyClassDelegate <NSObject>

Cited from http://stackoverflow.com/questions/9579337/self-delegate-respondstoselector-does-not-compile