滚动视图不会在 Swift 中使用 AutoLayout 垂直滚动内容

Question

我有这个UIViewController子类：

class MyCustomViewController: UIViewController, MyDelegate {

   var scrollContainerView: UIView = {
      let scrollContainerView = UIView(frame: CGRectZero)
      scrollContainerView.translatesAutoresizingMaskIntoConstraints = false
      return scrollContainerView
   }()

   var scrollView: UIScrollView = {
      var scrollView = UIScrollView()
      scrollView.translatesAutoresizingMaskIntoConstraints = false
      return scrollView
   }()

   lazy var customView: MyCustomView = {
      var customView = MyCustomView(frame: .zero)
      customView.translatesAutoresizingMaskIntoConstraints = false
      customView.delegate = self
      return customView
   }()

   override func loadView() {
      self.view = UIView()
      self.view.backgroundColor = UIColor.whiteColor()

      self.view.addSubview(self.scrollView)
      self.scrollView.addSubview(self.scrollContainerView)
      self.scrollContainerView.addSubview(self.customView)

      view.setNeedsUpdateConstraints()
   }

   override func updateViewConstraints() {

        self.scrollView.autoPinEdge(.Top, toEdge: .Bottom, ofView: self.view, withOffset: 0)
        self.scrollView.autoPinEdge(.Left, toEdge: .Left, ofView: self.view, withOffset: 0)
        self.scrollView.autoPinEdge(.Right, toEdge: .Right, ofView: self.view, withOffset: 0)
        self.scrollView.autoPinEdge(.Bottom, toEdge: .Bottom, ofView: self.view, withOffset: 0)

        self.scrollContainerView.autoPinEdge(.Top, toEdge: .Bottom, ofView: self.scrollView, withOffset: 0)
        self.scrollContainerView.autoPinEdge(.Left, toEdge: .Left, ofView: self.scrollView, withOffset: 0)
        self.scrollContainerView.autoPinEdge(.Right, toEdge: .Right, ofView: self.scrollView, withOffset: 0)
        self.scrollContainerView.autoPinEdge(.Bottom, toEdge: .Bottom, ofView: self.scrollView, withOffset: 0)

        self.customView.autoPinEdge(.Top, toEdge: .Bottom, ofView: self.scrollContainerView, withOffset: 0)
        self.customView.autoPinEdge(.Left, toEdge: .Left, ofView: self.scrollContainerView, withOffset: 0)
        self.customView.autoPinEdge(.Right, toEdge: .Right, ofView: self.scrollContainerView, withOffset: 0)
        self.customView.autoPinEdge(.Bottom, toEdge: .Bottom, ofView: self.scrollContainerView, withOffset: 0)

       super.updateViewConstraints()
   }
}

其中customView具有固定大小。 如果我在 iPhone 4S 模拟器中运行应用程序，在那里应该需要滚动才能看到完整的视图，我发现它水平滚动，而不是垂直滚动......我不明白我会错过什么。

Answer 1

看来你的约束有两个问题，

1. 将 scrollContainerView EqualWidth 设置为 scrollView 因为您希望滚动视图仅垂直滚动。

2. 如果customView里面没有subViews，它就无法计算出它需要的高度，所以你需要给customView设置FixedHeight的一些点，或者添加具有上下约束的子视图。

其他一切都很好。

希望这会帮助你。