ios - View 可见部分的触摸事件 ios swift 4

Question

我正在使用 Swift4 中的 Photo Collage，我使用 UIBezierPath 创建了拼贴，如下所示

我在 Storyboard 中有 5 个 ScrollView ，Scrollviews 的顺序如下所示

我正在使用以下代码创建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

现在的问题是我无法获取 Scrollviews 的触摸事件，因为 Scroll5 位于顶部。我想接触重叠 View ，例如 Scroll1、Scroll2 等等。简而言之，我需要在 View 可见的区域部分的特定 View 的触摸事件。

请参阅下面我想要触摸查看的图像。

我怎样才能接触到Overlapped Views？

请帮忙!

Answer 1

你必须确定你先将scrollview的superView设置为isUserInterfaceEnabled=true。

获取重叠 View 触摸事件:

这是我的代码:

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
}

hitTest 函数决定了您触摸的是哪个 View ，因此您只需返回重叠的 View 即可。