Extending a delegate from a base class

Question

I have an objc base class:

@protocol BaseClassDelegate;

@interface BaseClass : NSObject

@property (nonatomic, weak) id  delegate;         


        

Answer 1

I'd either create a wrapper delegate to make it the correct type in SubClass.

class SubClass: BaseClass {
    var myDelegate: SubClassDelegate? {
        get { return delegate as? SubClassDelegate }
        set { delegate = newValue }
    }
    @IBAction func onDoSomething(sender: AnyObject) {
        myDelegate?.additionalSubClassDelegateMethod();
    }
}

Or simply cast the delegate to the expected type:

(delegate as? SubClassDelegate)?.additionalSubClassDelegateMethod();