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Xcode – How to detect touch event across multiple views on my view controller?

In my viewController I have programmatically created several squares as sub-views.
Imagine it as a chessboard.

I would like to implement a method that executes some actions upon the sub-view (e.g., change the background color of a single square) when it gets touched by the user.

I have unsuccessfully tried with the UITapGestureRecognizer – I have read from Apple documentation that it applies only to one view at a time.

Do you have any suggestions?

Many thanks

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2

Answers


  1. 0

    Do it like this

    class YourCustomView : UIView {

    func  addTapGesture(action : @escaping ()->Void ){
        self.gestureRecognizers?.forEach({ (gr) in
            self.removeGestureRecognizer(gr)
        })
        let tap = MyTapGestureRecognizer(target: self , action: #selector(self.handleTap(_:)))
        tap.action = action
        tap.numberOfTapsRequired = 1

        self.addGestureRecognizer(tap)
        self.isUserInteractionEnabled = true

    }
}

    or you can use this even in a extension of UIView if you’re going to use it in multiple types of UIViews.

    And then use it like:

    let yourView = YourCustomView()
yourView.addTapGesture{[weak self] in
    //implement tap event here
}

    Notice that [weak self] is going to avoid getting a strong reference for closure to avoid a retain cycle there.

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  2. 0

    You can subclass UIWindow class and handle all the events in - (void)sendEvent:(UIEvent *)event there like sending notifications to all the views or communicate with some other way. Check the following repository for more info:
    https://github.com/mwinoto/TapDetectingWindow

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