iOS adding tapGesture to multiple Views

Question

I have multiple views defined in my main view. I want to add single tap gesture to all these views. Below is the code I have written, but this registers a tap gesture to the

Answer 1

I had the same problem where it only added to the last view. There might be a better solution, but I just created a tag gesture for each view and linked them to the same selector method (oneTap: in your case). In order to distinguish which view activated the method, you can just tag your views, feedsView.tag = 0; peopleView.tag = 1; and so on. Then when the method is called:

- (void)oneTap:(UIGestureRecognizer *)gesture {
    int myViewTag = gesture.view.tag;  // now you know which view called
    // use myViewTag to specify individual actions;
}

Answer 2

1 use hitTest:

CGPoint location = [singleTap locationInView:self.view];
id testView = [self.view hitTest:location withEvent:nil];

2 add THE Single TapGesture to multi views, only last view worked.

Answer 3

Add one tap gesture to multiple views (in this case UILabel), using computed properties. It creates new recognizer for every call.

    var recognizer: UITapGestureRecognizer {
        get {
            return UITapGestureRecognizer(target: self, action: #selector(self.labelTapped(_:)))
        }
    }

    label1.addGestureRecognizer(recognizer)
    label2.addGestureRecognizer(recognizer)
    label3.addGestureRecognizer(recognizer)
    label4.addGestureRecognizer(recognizer)

and labelTapped function

@objc func labelTapped(_ sender: UITapGestureRecognizer) {
    let tappedLabel:UILabel = (sender.view as! UILabel)
}

Answer 4

to attach multiple views to same gesture you can reinitialize the gesture before affecting to your view

here is an example in swift

override func viewDidLoad() {
    super.viewDidLoad()

    var tap = UITapGestureRecognizer(target: self, action: #selector(infoTapped(sender:)))
    tap.numberOfTapsRequired = 1
    info1Btn.addGestureRecognizer(tap)
    info1Btn.tag = 1

    tap = UITapGestureRecognizer(target: self, action: #selector(infoTapped(sender:)))
    info2Btn.addGestureRecognizer(tap)
    info2Btn.tag = 2

    tap = UITapGestureRecognizer(target: self, action: #selector(infoTapped(sender:)))
    info3Btn.addGestureRecognizer(tap)
    info3Btn.tag = 3

}


  @objc func infoTapped(sender: UITapGestureRecognizer){
    let view:UIView = sender.view!
    switch (view.tag) {
    case 1:
        print(view.tag) //  info 1 tapped
    case 2:
        print(view.tag) //  info2 tapped

    case 3:
        print(view.tag) //  info 3 tapped

    default:
        break;
    }
}

Answer 5

1. Can you attach a UIGestureRecognizer to multiple views? No.

2. Two options:

   a) Give every UIGestureRecognizer its own action. Pluses of this approach: strong decoupling. Minuses: more code reuse. But, you can mitigate code reuse by creating methods for common functionalities and just call the methods in the different actions.

   b) Give every view to which you add a UIGestureRecognizer a unique tag. Then, use a switch statement in the common action with the sender's view's tag as the case. Pluses: less code reuse. Minuses: tighter coupling. Something like this:

   UIGestureRecognizer *singleTap = [[UIGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)];
   [feedsView addGestureRecognizer:singleTap];
   feedsView.tag = 33;
   

   Then:

   - (void)singleTapAction:(UIGestureRecognizer *)singleTap {
       UIView *view = singleTap.view;
       switch (view.tag) {
           case 33
               // view is feedsView
               break;
   
           default:
               break;
       }
   }
   

   Although it's usually best to go with the option that decouples, if all of your actions are very similar, which seems to be the case here, and you are quite sure that they'll remain very similar in the future, then option b) with the tags is probably the better choice.

P.S. It's unnecessary to explicitly set numberOfTapsRequired & numberOfTouchesRequired to 1 since they're both set to 1 by default. You can confirm this by holding Command and clicking on numberOfTapsRequired in Xcode.

Answer 6

// Add tap gesture in swift 4

    let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
    view.addGestureRecognizer(tap)
    view.isUserInteractionEnabled = true
    self.view.addSubview(view)

// function which is triggered when handleTap is called
@objc func handleTap(_ sender: UITapGestureRecognizer) {
    if sender.view == view1 {
       // do something
    }
    else{
       // do next thing
    }
}

//USE in view did load: tapGestures(view: view1) tapGestures(view: view2) tapGestures(view: view3)