ios - ScrollView 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 模拟器中运行该应用程序，应该需要滚动以查看完整 View ，我发现它水平滚动，但不是垂直滚动……我不明白我会遗漏什么。

Answer 1

看来你的约束有两个问题，

1. Set scrollContainerView EqualWidth to scrollView as you want your scroll view to be scroll vertically only.

2. If the customView does not have subViews inside it, it could not able to calculate the height required for it, so you either need to set some points of FixedHeight to the customView or add subviews with top to bottom constraints.

其他一切正常

希望对您有所帮助。