CODEWITHSUNDEEP
iosswiftuiapplicationdelegate
Michael
Michael

Reputation: 25

How to pass in the object that takes delegate

Fast search for this question gave me nothing. At the same time it's hard to explain, I guess all is clear from this method. Take a look at this, please:

func tap(sender: AnyObject, action: Selector) -> UITapGestureRecognizer {
        let tap = UITapGestureRecognizer(target: sender, action: action)
        tap.delegate = sender
        return tap
    }

Error :

Type 'AnyObject' does not conform to protocol 'UIGestureRecognizerDelegate'

The question is what need to write extra for AnyObject to avoid of getting this message? Or any other ways?

Upvotes: 0

Views: 63

Answers (1)

Sebastian
Sebastian

Reputation: 8164

Assuming, that sender always is of type UIGestureRecognizerDelegate you can use a forced downcast:

tap.delegate = sender as UIGestureRecognizerDelegate

Otherwise, use a failing cast:

if let delegate = sender as? UIGestureRecognizerDelegate
{
    tap.delegate = delegate
}

As reference, have a look at Type Casting for Any and AnyObject contained in the Swift programming language guide.

Note, that to me this style of assigning the delegate seems to be unusual and error prone.

Upvotes: 1

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