CODEWITHSUNDEEP
iosswifteventstouch
Khushbu Desai
Khushbu Desai

Reputation: 1023

Touch event on Visible Portion of Views ios swift 4

I am working of Photo Collage which is in Swift4 , I had created collage using UIBezierPath as Below

enter image description here

I have 5 scroll views in Storyboard and the sequence of Scrollviews as Below

enter image description here

Using Following code I am creating Shapes :

    var path1 = UIBezierPath()
    path1.move(to: CGPoint(x: 0, y: 0))
    path1.addLine(to: CGPoint(x: superView.frame.width / 2, y: 0))
    path1.addLine(to: CGPoint(x: 0, y: superView.frame.width / 2))
    path1.addLine(to: CGPoint(x: 0, y: 0))

    var borderPathRef1 = path1.cgPath

    var borderShapeLayer1 = CAShapeLayer()
    borderShapeLayer1.path = borderPathRef1

    scroll1.layer.mask = borderShapeLayer1
    scroll1.layer.masksToBounds = true


    var path2 = UIBezierPath()
    path2.move(to: CGPoint(x: 0, y: 0))
    path2.addLine(to: CGPoint(x: superView.frame.width / 2, y: 0))
    path2.addLine(to: CGPoint(x: superView.frame.width / 2, y: superView.frame.width / 2))
    path2.addLine(to: CGPoint(x: 0, y: 0))

    var borderPathRef2 = path2.cgPath

    var borderShapeLayer2 = CAShapeLayer()
    borderShapeLayer2.path = borderPathRef2

    scroll2.layer.mask = borderShapeLayer2
    scroll2.layer.masksToBounds = true

Now the issue is I am not able to get touch event of Scrollviews as Scroll5 is on top. I want to get Touch on Overlapped views like Scroll1, Scroll2 and so on. In Short I need touch event for particular view on the portion of area where the view is visible.

See The Image Below Where I want Touch for Views.

enter image description here

How can I get touch on Overlapped Views?

Please Help!

Upvotes: 2

Views: 569

Answers (2)

P. Stern
P. Stern

Reputation: 351

@Versus answer works, but has a few peculiar behaviors. It causes CustomView to intercept taps outside its frame, and it prevents buttons in the cover view (view5) from working. This version of hitTest fixes those cases:

override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    if view1.point(inside: self.convert(point, to: view1), with: event) {
        // inside view1
        return view1
    } else if self.point(inside: point, with: event) {
        // inside CustomView (but outside view1)
        return super.hitTest(point, with: event)  // superview's tapped view  
    } else {
        // outside CustomView
        return nil
    }
}

Upvotes: 0

Versus
Versus

Reputation: 414

You have to be sure that you set the superView of scrollview to isUserInterfaceEnabled=true first.

To get overlapped views touch event:

here is my code:

class CustomView: UIView {
let view1: UIView
let view2: UIView
let view3: UIView
let view4: UIView
let view5: UIView

override init(frame: CGRect) {
    view1 = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
    view1.backgroundColor = UIColor.black
    view1.isUserInteractionEnabled = true
    view2 = UIView(frame: CGRect(x: 100, y: 0, width: 100, height: 100))
    view2.backgroundColor = UIColor.orange
    view2.isUserInteractionEnabled = true
    view3 = UIView(frame: CGRect(x: 0, y: 100, width: 100, height: 100))
    view3.backgroundColor = UIColor.blue
    view3.isUserInteractionEnabled = true
    view4 = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
    view4.backgroundColor = UIColor.brown
    view4.isUserInteractionEnabled = true
    view5 = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
    view5.tag = 121
    view5.backgroundColor = UIColor.red
    super.init(frame: frame)
    self.addSubview(view1)
    self.addSubview(view2)
    self.addSubview(view3)
    self.addSubview(view4)
    self.addSubview(view5)
    view1.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(touchAction)))
}

@objc func touchAction () {
    print("----------- touch view 1")
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    if (view1.point(inside: self.convert(point, to: view1), with: event)) {
        return view1
    }
    return self
}

}

The function hitTest decides that which view you are touching, so you just need to return the overlapped view.

Upvotes: 2

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