CODEWITHSUNDEEP
iosuicollectionviewuicontrol
Martin Mickey
Martin Mickey

Reputation: 343

Swift - UIControl addTarget not working

I have created XIB with UIView. I have assigned class MyViewControl: UIControl to it, so I can add touch up inside action. It works, touches are called inside my class.

Now, I have created UICollectionView and add this "xib" as cell view. I want now touches to be handled inside UICollectionViewDelegate class. So I have done this:

func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {        
    for v in cell.contentView.subviews {            
        if let c: MyViewControl = v as? MyViewControl {               
            c.isUserInteractionEnabled = true
            c.addTarget(self, action: #selector(myClick), for: UIControlEvents.touchUpInside)
        }
    }        
}

func myClick(sender: Any){
    print("click....")
}

However, myClick selector is never called. If I add UIButton to the MyViewControl and do the same thing (addTarget) for this button, callbacks are correctly called.

Upvotes: 2

Views: 4519

Answers (1)

Swaroop Kurra
Swaroop Kurra

Reputation: 50

Add underscore _ before sender in function as _ sender: Any and add (_:) in the #selector under action viz. myClick(_ :)

func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {        
    for v in cell.contentView.subviews {            
        if let c: MyViewControl = v as? MyViewControl {               
            c.isUserInteractionEnabled = true
            c.addTarget(self, action: #selector(myClick(_:)), for: UIControlEvents.touchUpInside)
        }
    }        
}

func myClick(_ sender: Any){
    print("click....")
}

Hope this helps

Upvotes: 2

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