ios - UIPageViewController 未在单击按钮时完成转换

Question

我有一个 UIPageViewController 处理一组 viewControllers当我在它们之间滑动时，一切都很好，但是我有一些方法(成功登录后和单击菜单按钮后)触发“跳转”到 UIPageViewControllers 中的 viewController > 数组。每当我跳转到一个页面时，转换都没有完成，并且我有一个屏幕“卡在”两个 viewControllers

之间

为简单起见，我将只添加成功登录代码，因为我为按钮点击设置了相同的所有内容，并且发生了同样的事情。

这是我的 UIPageViewController 设置:

import UIKit

class PageViewController: UIPageViewController , UIPageViewControllerDataSource , UIPageViewControllerDelegate , ClubViewControllerDelegate , CustomSvDelegate{

//clubvcdelegate protocol method

func fbLoggedInWithSuccess(){
self.displayPageForIndex(index: 4, animated: false)
}

//menubuttondelegate protocol method
func menuButtonPressed0() {

    self.displayPageForIndex(index: 0, animated: false)
    self.currentPageIndex = 0
    self.closeMenu()
}

//page swipe control

lazy var vcArray : [UIViewController] = {
    return [self.vcInstance (name : "clubVC"),
            self.vcInstance (name : "menuVC"),
            self.vcInstance (name : "contactVC"),
            self.vcInstance (name : "aboutVC"),
            self.vcInstance (name : "membersVC")]
    }()

private func vcInstance(name : String) -> UIViewController{
    let storyBoard = UIStoryboard(name: "Main", bundle: nil)
    return storyBoard.instantiateViewController(withIdentifier: name)
}


override func viewDidLoad() {
    super.viewDidLoad()
    self.dataSource = self
    self.delegate = self
    if let clubVC = vcArray.first {
        let club = clubVC as! ClubViewController
        club.delegate = self
        setViewControllers([clubVC], direction: .forward, animated: true, completion: nil)
    }
    self.generateStackView()
}


override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    for view in self.view.subviews {
        if view is UIScrollView {view.frame = UIScreen.main.bounds} else if view is UIPageControl {view.backgroundColor = UIColor.clear}
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?{
    guard let viewControllerIndex = vcArray.index(of: viewController) else {return nil}

    let previousIndex = viewControllerIndex - 1

    guard previousIndex >= 0 else {return vcArray.last}

    guard vcArray.count > previousIndex else {return nil}

    return vcArray[previousIndex]

}


public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?{
    guard let viewControllerIndex = vcArray.index(of: viewController) else {return nil}

    let nextIndex = viewControllerIndex + 1

    guard nextIndex < vcArray.count else {return vcArray.first}

    guard vcArray.count > nextIndex else {return nil}

    return vcArray[nextIndex]

}

public func presentationCount(for pageViewController: UIPageViewController) -> Int{
    return vcArray.count
}


public func presentationIndex(for pageViewController: UIPageViewController) -> Int{
    guard let firstViewController = viewControllers?.first ,
    let firstViewControllerIndex = vcArray.index(of: firstViewController) else {
        return 0
    }
    return firstViewControllerIndex
}

这就是我设置 fblogin 成功的方式:

protocol ClubViewControllerDelegate:class {
func fbLoggedInWithSuccess()
}

class ClubViewController: UIViewController , FBSDKLoginButtonDelegate {
var delegate:ClubViewControllerDelegate?

func showFbDetails(){

    let accesToken = FBSDKAccessToken.current()

    guard let accesTokenString = accesToken?.tokenString else {return}

    let credentials = FIRFacebookAuthProvider.credential(withAccessToken: accesTokenString)

    FIRAuth.auth()?.signIn(with: credentials, completion: { (user, error) in
        if error != nil {
            print ("something went wrong" , error!)
            return
        }
        print ("succes")
        self.delegate?.fbLoggedInWithSuccess()
    })

}

图片:

编辑2这仅在动画为 true 时发生，为 false 时正确完成

编辑3这是我现在用来设置 View Controller 的方法:

    func displayPageForIndex(index : Int , animated : Bool = true){
    assert(index >= 0 && index < self.vcArray.count, "Error: Attempting to display a page for an out of bounds index")
    if self.currentPageIndex == index {return}
    if index < self.currentPageIndex {
        self.setViewControllers([self.vcArray[index]], direction: .reverse, animated: false, completion: nil)
    } else if index > self.currentPageIndex {
        self.setViewControllers([self.vcArray[index]], direction: .forward, animated: false, completion: nil)
    }
}

我在 fbLoggenInWithSuccess 和 menuButtonPressed 中调用它。另外，有一个变量 CurrentIndex 保存页面的当前索引

Answer 1

正如马特建议的那样，删除 viewDidLayoutSubviews 解决了这个问题