子视图滚动不起作用 SWIFT

Question

目标：让viewcontroller有多个页面，并且可以通过segmented controller进行交换，页面内容可以垂直滚动

详情：

• 我制作了一个 pagviewcontroller 并将其作为子视图嵌入到主视图控制器

  //add pageviewcontroller as subview to viewcontroller
  if let vc = storyboard?.instantiateViewControllerWithIdentifier("ProfileEditController"){
  
      self.addChildViewController(vc)
      self.view.addSubview(vc.view)
  
      EditTabs = vc as! UIPageViewController
      EditTabs.dataSource = self
      EditTabs.delegate = self
  
      //define First page
      EditTabs.setViewControllers([pagesAtIndexPath(0)!], direction:.Forward, animated: true, completion: nil)
      EditTabs.didMoveToParentViewController(self)
  
      //bring segmented view buttons to front of pageViews
      self.view.bringSubviewToFront(self.topTabs)
  }
  

• 调用pageViewController函数，通过restore Identifiers添加页面

• 我通过获取 pageindex 并像这样设置 viewcontroller 来管理分段视图控制器：

  EditTabs.setViewControllers([pagesAtIndexPath(0)!], direction:.Reverse, animated: true, completion: nil)
  

• 在故事板中，子页面内部有滚动视图来保存内容

• 我通过 segue 调用它来测试子页面滚动视图，它的工作正常

案例：

• 一切正常只有子页面的滚动视图根本不起作用

如何解决这个问题？ 您的指导方针将不胜感激

谢谢，

Answer 1

1. 我创建了一个带有 PageViewController 的视图控制器，其中包含三个具有滚动视图的视图控制器。它工作正常。

   导入 UIKit 类 ViewController: UIViewController, UIPageViewControllerDataSource {

   var viewControllers : [UIViewController]?
   override func viewDidLoad() {
       super.viewDidLoad()
       CreatePageView()
   }
   
   func CreatePageView() {
   
       SetupViewControllers()
   
       let pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
       pageViewController.dataSource = self
       pageViewController.setViewControllers([(viewControllers?[0])!] , direction: .forward, animated: false, completion: nil)
       pageViewController.view.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height);
       pageViewController.view.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height);
       addChildViewController(pageViewController)
       view.addSubview(pageViewController.view)
       pageViewController.didMove(toParentViewController: self)
       pageViewController.view.backgroundColor = UIColor.blue
   }
   
   func SetupViewControllers() {
       let firstVC = UIViewController()
       firstVC.view.tag = 100
       firstVC.view.backgroundColor = UIColor.red
       AddScrollView(bgView: firstVC.view)
       let secondVC = UIViewController()
       secondVC.view.tag = 101
       secondVC.view.backgroundColor = UIColor.brown
       AddScrollView(bgView: secondVC.view)
       let thirdVC = UIViewController()
       thirdVC.view.tag = 102
       thirdVC.view.backgroundColor = UIColor.purple
       AddScrollView(bgView: thirdVC.view)
   
       viewControllers = [firstVC,secondVC,thirdVC]
   
   }
   
   func AddScrollView(bgView: UIView) {
       let scrollView = UIScrollView()
       scrollView.frame = CGRect.init(x: 10, y: 10, width: bgView.frame.width-20, height: bgView.frame.height-20)
       scrollView.backgroundColor = UIColor.init(red: 0.34, green: 0.45, blue: 0.35, alpha: 0.9)
       bgView.addSubview(scrollView)
       scrollView.contentSize = CGSize.init(width: scrollView.frame.size.width, height: scrollView.frame.size.height+200)
   }
   
   
   func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
       if viewController.view.tag == 101 {
           return viewControllers?[0]
       }
       else if viewController.view.tag == 102{
           return viewControllers?[1]
       }
       else{
           return viewControllers?[2]
       }
   }
   
   public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
       if viewController.view.tag == 101 {
           return viewControllers?[0]
       }
       else if viewController.view.tag == 102{
           return viewControllers?[1]
       }
       else{
           return viewControllers?[2]
       }
   }
   
   func presentationCount(for pageViewController: UIPageViewController) -> Int {
       return (viewControllers?.count)!
   }
   
   func presentationIndex(for pageViewController: UIPageViewController) -> Int {
       return 0
   }
   

   }

Answer 2

Stack 上经常出现类似的问题。对于我自己在非常相似的情况下的问题，我也能够在它自己的视图中毫无问题地使用滚动视图，但是当用作另一个子视图中的子视图时，我需要以编程方式设置滚动视图尺寸。

斯威夫特 2

scrollView.setFrame(CGRectMake(0, 0, DEVICE_WIDTH, DEVICE_HEIGHT))

或

斯威夫特 3

scrollView.setFrame(CGRect(x: 0, y: 0, width: DEVICE_WIDTH, height: DEVICE_HEIGHT))

另一个（通常被视为更好的）建议是根据内容自动设置大小。

var contentRect = CGRectZero
for view in self.scrollView.subviews {
    contentRect = CGRectUnion(contentRect, view.frame)
}
self.scrollView.contentSize = contentRect.size 

希望这会有所帮助。