如何在UIScrollView中加载UIViewController

Question

这是我的设置.我有一个UIScrollView在我的主视图控制器的顶部,我加载了多个视图控制器.我还有一个Add按钮,它将使用Push segue呈现一个新的视图控制器.

我希望这个视图控制器也只在滚动视图的顶部而不是全屏加载.
到目前为止,我尝试了两种不同的东西,但没有任何工作:

1. 在滚动视图中添加视图控制器prepareForSegue:

     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
       let addViewController = segue.destination as! AddViewController
   
       addChildViewController(addViewController)
       addViewController.view.frame = CGRect(x: 0, y: 0, width: width, height: height)
       scrollView.addSubview(addViewController.view)
       didMove(toParentViewController: self)
   }
   

2. 在UIButton操作中添加视图控制器:

@IBAction func addDidTouch(_ sender:AnyObject){

    let addViewController = AddViewController()

    addChildViewController(addViewController)
    addViewController.view.frame = CGRect(x: 0, y: 0, width: width, height: height)
    scrollView.addSubview(addViewController.view)
    didMove(toParentViewController: self)
}

这两个解决方案都崩溃了我的应用程序.
有没有办法正确实现这个？

Answer 1

您无法在同一视图控制器上推送任何视图控制器,您需要将容器视图添加到滚动视图.然后,如果你想要,你可以滚动添加按钮的滚动滚动,这样看起来好像新的控制器被添加到它.它可以这样做,

scrollView.contentSize = CGSize(width: screenWidth*3, height: 1)

    let first = getStoryboard(StoryboardName.Main).instantiateViewControllerWithIdentifier("FirstViewController") as! FirstViewController

    let second = getStoryboard(StoryboardName.Main).instantiateViewControllerWithIdentifier("SecondViewController") as! SecondViewController

    let third = getStoryboard(StoryboardName.Main).instantiateViewControllerWithIdentifier("ThirdViewController") as! ThirdViewController

    self.addChildViewController(first)
    self.scrollView.addSubview(first.view)
    first.willMoveToParentViewController(self)

    self.addChildViewController(second)
    self.scrollView.addSubview(second.view)
    second.willMoveToParentViewController(self)

    self.addChildViewController(third)
    self.scrollView.addSubview(third.view)
    third.willMoveToParentViewController(self)

    first.view.frame.origin = CGPointZero
    second.view.frame.origin = CGPoint(x: screenWidth, y: 0)
    third.view.frame.origin = CGPoint(x: 2*screenWidth, y: 0)

如果您只想通过添加按钮添加(移动)到另一个视图控制器,则可能需要禁用滚动视图的滚动.