Question

我正在使用UISegmentedControl和UIPageViewController实现Tab控件实现。下面提到的代码在某些设备上运行良好，对应于单击的段控件的视图将按预期显示。

在某些iPhone设备上（我认为使用iOS 11），当我点击分段控件时，两个UIViewControllers根本不可见。当我调试View Hierarchy时，我根本看不到与该段控件对应的VC。

但是我注意到当点击相应的段控件时，会在每个VC中调用VC的所有委托方法，如ViewDidLoad，ViewWillAppear等。

我可能做错了什么？

Date        Available   SickLeave  CasualLeave  MorningPermission EveningPermission 
2017-12-20    3           1           0               0               0
2017-12-21    2           1           1               0               0

当从UIViewController实现中执行时，下面提到的代码用于检查View是否可见失败。

import UIKit

class Solution2SegmentControl : UISegmentedControl
{
    private var current:Int = UISegmentedControlNoSegment
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        current = self.selectedSegmentIndex
        super.touchesBegan(touches, with: event)
    }
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        if current == self.selectedSegmentIndex {
            self.sendActions(for: .valueChanged)
        }
    }
}

class ATSReferralScreensContainer: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {
    weak var delegateObj:ATSParentViewController?
    @IBOutlet var switchControl: UISegmentedControl!
    var referAFriendVC :ATSReferalScreenVC?
    var referralInformationVC : ATSReferralInfomationVC?

    func setVCForIndex(index: Int) {
        setViewControllers([index == 0 ? referAFriendVC! : referralInformationVC!], direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)
    }



    func segmentControlClicked(sender: UISegmentedControl)
    {
        setVCForIndex(index: sender.selectedSegmentIndex)

    }


    @IBAction func SegmentControlClick(_ sender: UISegmentedControl) {

        setVCForIndex(index: sender.selectedSegmentIndex)

    }

    override func viewDidLoad() {

        super.viewDidLoad()
        self.delegate = self;
        let mainStoryBoard = UIStoryboard(name: "MainStoryBoard_ATS", bundle: nil)
        referAFriendVC = mainStoryBoard.instantiateViewController(withIdentifier: "ReferalScreenVC") as! ATSReferalScreenVC

        referralInformationVC = mainStoryBoard.instantiateViewController(withIdentifier: "ReferralInformationVC") as! ATSReferralInfomationVC
        referralInformationVC?.parentDelegateObj = delegateObj

        setVCForIndex(index: 0)
    }

    override func viewWillAppear(_ animated: Bool) {
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }



    func pageViewController(_ pageView:UIPageViewController, viewControllerAfter nextVC:UIViewController) -> UIViewController?
    {
        if pageView == referAFriendVC
        {return referralInformationVC } else { return nil }
    }

    func pageViewController(_ pageView:UIPageViewController, viewControllerBefore previousVC:UIViewController) -> UIViewController?
    {
        if pageView == referralInformationVC
        { return referAFriendVC } else { return nil }

    }

}

UIPageViewController不显示UIView

0 个答案: