尽管 userInteractionEnabled = true，但 UIView 中的 UIButton 没有响应触摸事件

Question

我很难解决这个问题。我有一个自定义 UIView，它包含一个 UIImageView 和一个 UIButton。自定义的 UIView 称为 PPButton，添加这些控件的代码如下。需要注意的一件事是我正在覆盖 drawRect，这不应该影响这里发生的事情。

private func addSubviews() {

    let buttonFontMultipllier : CGFloat = 4.5 / 10.0
    let buttonFontSize = (self.subRect!.height) * buttonFontMultipllier

    self.ppButton = UIButton.buttonWithType(UIButtonType.Custom) as? UIButton
    self.ppButton!.setTitle(self.ppButtonTitle!, forState: .Normal)
    self.ppButton!.setTitleColor(UIColor.whiteColor(), forState: .Normal)
    self.ppButton!.titleLabel!.font = UIFont(name: "Formata-BoldCondensed", size: buttonFontSize)
    self.ppButton!.contentHorizontalAlignment = .Left
    self.ppButton!.addTarget(self, action:"buttonWasTapped:", forControlEvents: UIControlEvents.TouchUpInside)
    self.ppButton!.userInteractionEnabled = true
    self.ppButton!.backgroundColor = UIColor.greenColor()

    self.ppButton!.layer.borderColor = UIColor.greenColor().CGColor
    self.ppButton!.layer.borderWidth = 1.0

    self.ppImage = UIImageView()
    self.ppImage!.contentMode = UIViewContentMode.ScaleAspectFit
    self.ppImage!.userInteractionEnabled = false

    self.ppImage!.layer.borderColor = UIColor.greenColor().CGColor
    self.ppImage!.layer.borderWidth = 1.0

    self.ppButtonView!.addSubview(self.ppButton!)
    self.ppButtonView!.addSubview(self.ppImage!)

    self.ppButtonView!.bringSubviewToFront(self.ppButton!)
    self.ppButtonView!.sendSubviewToBack(self.ppImage!)
    self.ppButtonView!.userInteractionEnabled = false;

    self.addSubview(self.ppButtonView!)

    superview!.layer.backgroundColor = UIColor.yellowColor().CGColor
}

这些按钮被添加到另一个自定义视图中，该视图被添加到自定义视图控制器中。将 PPButtons 添加到自定义 HomeView 的代码如下。

func addSubviews() {

    self.homeLogo = UIImageView()
    self.homeLogo!.contentMode = UIViewContentMode.ScaleAspectFit
    self.addSubview(self.homeLogo!)

    self.orderBtn = PPButton(title: "Order")
    self.orderBtn!.delegate = self
    self.orderBtn!.userInteractionEnabled = false
    self.addSubview(self.orderBtn!)

    self.findUsBtn = PPButton(title: "Find Us")
    self.findUsBtn!.delegate = self
    self.orderBtn!.userInteractionEnabled = false
    self.addSubview(self.findUsBtn!)

    self.menuBtn = PPButton(title: "Menu")
    self.menuBtn!.delegate = self
    self.orderBtn!.userInteractionEnabled = false
    self.addSubview(self.menuBtn!)

    self.clubPatronBtn = PPButton(title: "Club Patron")
    self.clubPatronBtn!.delegate = self
    self.orderBtn!.userInteractionEnabled = false
    self.addSubview(self.clubPatronBtn!)

    self.loginButton = UIButton()
    self.loginButton!.setTitle(String("Login or Create an Account").uppercaseString, forState: .Normal)
    self.loginButton!.setTitleColor(UIColor.whiteColor(), forState: .Normal)
    self.loginButton!.titleLabel?.font = UIFont(name: "Formata-BoldCondensed", size: 18.0)
    self.loginButton!.userInteractionEnabled = true
    self.loginButton!.addTarget(self, action: Selector("testFunc"), forControlEvents: UIControlEvents.TouchUpInside)

    self.addSubview(self.loginButton!)
}

当我尝试单击按钮时，目标不会触发 PPButton。此外，它们不会触发 loginButton，它只是一个简单的 UIButton。所有这些都是以编程方式添加的。我确定我做错了一些小事。

另外，我从 ViewController 开始检查我的所有视图，哪些视图的 userInteractionEnabled 设置为 true。函数和输出如下。请帮忙！

func logViewHierarchy(view: UIView, num: Int) {

    var index = num
    for i in 0..<index {
        print("\t")
    }

    index = index + 1
    println("\(NSStringFromClass(view.dynamicType)) userInteractionEnabled: \(view.userInteractionEnabled)")
    for subview in view.subviews {
        self.logViewHierarchy(subview as! UIView, num: index)
    }
}

输出

UIView userInteractionEnabled: false
     UIImageView userInteractionEnabled: false
     _UILayoutGuide userInteractionEnabled: true
     _UILayoutGuide userInteractionEnabled: true
     Pizza_Patron.HomeView userInteractionEnabled: false
          UIImageView userInteractionEnabled: false
          Pizza_Patron.PPButton userInteractionEnabled: false
               UIView userInteractionEnabled: false
                    UIImageView userInteractionEnabled: false
                    UIButton userInteractionEnabled: true
                         UIButtonLabel userInteractionEnabled: false
          Pizza_Patron.PPButton userInteractionEnabled: true
               UIView userInteractionEnabled: false
                    UIImageView userInteractionEnabled: false
                    UIButton userInteractionEnabled: true
                         UIButtonLabel userInteractionEnabled: false
          Pizza_Patron.PPButton userInteractionEnabled: true
               UIView userInteractionEnabled: false
                    UIImageView userInteractionEnabled: false
                    UIButton userInteractionEnabled: true
                         UIButtonLabel userInteractionEnabled: false
          Pizza_Patron.PPButton userInteractionEnabled: true
               UIView userInteractionEnabled: false
                    UIImageView userInteractionEnabled: false
                    UIButton userInteractionEnabled: true
                         UIButtonLabel userInteractionEnabled: false
          UIButton userInteractionEnabled: true
               UIButtonLabel userInteractionEnabled: false

Answer 1

所以看起来您的顶级视图以及一些较低的视图都将userInteractionEnabled 设置为false。这会向下级联，因此如果超级视图关闭了交互，则其子视图将不会接收交互事件。

如果您想禁用某些视图的交互，您可以重新排序层次结构，只需为这些超级视图打开交互或尝试类似的操作并传递事件：

How to get touches when parent view has userInteractionEnabled set to NO in iOS