ios - 使用 setTranslatesAutoresizingMaskIntoConstraints(false) 在 UIView 中添加为 subview 时，不会调用 UIButton 操作

Question

我有一个以编程方式创建的 UIButton，为事件“UIControlEvents.TouchUpInside”添加了“按下”功能。但是当添加为 UIView 的 subview 时，不会调用“按下”方法。下面提供代码供您引用。但是，当我删除 setTranslatesAutoresizingMaskIntoConstraints(false) 时它会起作用。我需要使用此方法来自动调整布局大小。

var myView = UIView()
let orderBook = UIButton()

override func viewDidLoad() {
    super.viewDidLoad()

    myView.backgroundColor = UIColor.redColor()
    myView.setTranslatesAutoresizingMaskIntoConstraints(false)
    self.view.addSubview(myView)
    
    let views1 = ["myView": myView]

    var constV = NSLayoutConstraint.constraintsWithVisualFormat("V:|-[myView(>=100)]-|", options: NSLayoutFormatOptions.DirectionLeadingToTrailing, metrics: nil, views: views1)

    var constH = NSLayoutConstraint.constraintsWithVisualFormat("H:[myView(==100)]|", options: NSLayoutFormatOptions.DirectionLeadingToTrailing, metrics: nil, views: views1)

    self.view.addConstraints(constH)
    self.view.addConstraints(constV)

    orderBook.setTitle("Order Book", forState: UIControlState.Normal)
    orderBook.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)
    orderBook.addTarget(self, action: "pressed:", forControlEvents: UIControlEvents.TouchUpInside)

    myView.addSubview(orderBook)
}

func pressed(sender: UIButton!) {
    println("pressed")
}

override func viewDidLayoutSubviews() {
    orderBook.frame = CGRectMake(0, 0, myView.frame.width, 100)      
}

Answer 1

我知道我的回复有点晚了，但无论如何我都会回复那些仍然有这个问题，或者已经想出解决方法的人。

以编程方式将 UIButton 添加到 UIView 后无法与 UIButton 交互的原因是您没有向 UIButton 添加所有必要的约束。在我的特殊情况下，我没有添加宽度/高度约束。下面是我以编程方式创建的按钮示例，我将其添加到同样以编程方式创建的 UIView。请注意我添加到按钮的约束。

    var popupView = UIView()
    popupView.setTranslatesAutoresizingMaskIntoConstraints(false)
    popupView.backgroundColor = Color.fromHex("#FFFFFF", alpha: 1)
    popupView.layer.cornerRadius = 20
    popupView.clipsToBounds = true

    var bottomView = UIView(frame: CGRectMake(0, 0, popupView.frame.size.width, 80))
    bottomView.setTranslatesAutoresizingMaskIntoConstraints(false)

    var singleBtn = UIButton()
    singleBtn.titleLabel?.font = UIFont(name: "Nunito-Regular", size: 20)
    singleBtn.setTitleColor(Color.fromHex("#979797", alpha: 1), forState: UIControlState.Normal)
    singleBtn.setTitleColor(Color.fromHex("#56DAF0", alpha: 1), forState: UIControlState.Highlighted)

    singleBtn.setTitle("OK", forState: UIControlState.Normal)
    singleBtn.addTarget(self, action: "singleBtnAction:", forControlEvents: UIControlEvents.TouchUpInside)
    singleBtn.setTranslatesAutoresizingMaskIntoConstraints(false)
    singleBtn.backgroundColor = UIColor.redColor()
    bottomView.addSubview(singleBtn)

    bottomView.addConstraint(NSLayoutConstraint(item: singleBtn, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1.0, constant: 50))
    bottomView.addConstraint(NSLayoutConstraint(item: singleBtn, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1.0, constant: 50))
    bottomView.addConstraint(NSLayoutConstraint(item: singleBtn, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: bottomView, attribute: NSLayoutAttribute.CenterX, multiplier: 1.0, constant: 0))
    bottomView.addConstraint(NSLayoutConstraint(item: singleBtn, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: bottomView, attribute: NSLayoutAttribute.CenterY, multiplier: 1.0, constant: 0))