子视图滚动不起作用 SWIFT

Posted 2023-02-27

【中文标题】子视图滚动不起作用 SWIFT

【英文标题】：subview scroll is not working SWIFT

【发布时间】：2016-08-08 17:54:48

【问题描述】：

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，

【参考方案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

【参考方案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。