我有两个 UIBarButtonItems在我的导航 Controller 上:

    segmentControl = UISegmentedControl(items: ["Up", "Down"])
    infoItem = UIBarButtonItem(image: infoImage,
                               style: .plain, 
                               target: self,
                               action: #selector(infoAction))
    navigationItem.rightBarButtonItems = [infoItem, UIBarButtonItem(customView: segmentControl)]

点击 infoItem 时我这样做:

@objc func infoAction()
{
    let popoverContentController = InfoViewController()

    popoverContentController.preferredContentSize = CGSize(width: 300, height: 300)
    popoverContentController.modalPresentationStyle = .popover
    popoverContentController.popoverPresentationController?.delegate = self
    popoverContentController.popoverPresentationController?.passthroughViews = nil

    self.present(popoverContentController, animated: true, completion: nil)
}

然后调用 UIPopoverPresentationControllerDelegate功能:

func prepareForPopoverPresentation(_ popoverPresentationController: UIPopoverPresentationController)
{
    popoverPresentationController.permittedArrowDirections = .any
    popoverPresentationController.barButtonItem = infoItem
    popoverPresentationController.passthroughViews = nil
}

func adaptivePresentationStyle(for controller: UIPresentationController,
                               traitCollection: UITraitCollection) -> UIModalPresentationStyle
{
    return .none
}

即使我设置了 passthroughViews至 nil两次，UISegmentedControl当弹出窗口在屏幕上时，不会脱色并保持可点击状态。

如果在 UISegmentedControl 上显示任何其他弹出窗口表现正常:脱色且不可点击。

我在这里错过了什么？

最佳答案

查看您的代码，一切似乎都很好。看来操作系统有问题。

我已经找到了一个快速修复方法，除非他们在下一版本的 iOS 中检查并修复它。

1. 定义 barButtonItems 和一个变量，以在您的 ViewController 中全局保存现有色调。

   var infoItem: UIBarButtonItem!
   var segmentItem: UIBarButtonItem!
   var savedTintColour: UIColor? = nil
   

2. 在你的ViewDidLoad()中初始化它们

   segmentedControl = UISegmentedControl(items: ["Up", "Down"])
   infoItem = UIBarButtonItem(image: UIImage(named: "setting_mobile"),
                              style: .plain,
                              target: self,
                              action: #selector(infoAction))
   segmentItem = UIBarButtonItem(customView: segmentedControl)
   navigationItem.rightBarButtonItems = [infoItem, segmentItem]
   

3. InfoAction 的代码将保持不变。

   @objc func infoAction() {
       let popoverContentController = InfoViewController()
   
       popoverContentController.preferredContentSize = CGSize(width: 300, height: 300)
       popoverContentController.modalPresentationStyle = .popover
       popoverContentController.popoverPresentationController?.delegate = self
       popoverContentController.popoverPresentationController?.passthroughViews = nil
   
       self.present(popoverContentController, animated: true, completion: nil)
   }
   

4. 实现委托(delegate)方法 prepareForPopoverPresentation 并将色调颜色设置为 darkGray，并将之前可用的 tintColour 保存到一个变量中，以便我们可以在启用时重用它。

   func prepareForPopoverPresentation(_ popoverPresentationController: UIPopoverPresentationController) {
   popoverPresentationController.permittedArrowDirections = .any
   popoverPresentationController.barButtonItem = infoItem
   popoverPresentationController.passthroughViews = nil
   
   self.segmentItem.isEnabled = false
   if savedTintColour == nil {
       savedTintColour = self.segmentedControl.tintColor
   }
   self.segmentedControl.tintColor = .darkGray
   }
   

5. 实现委托(delegate)方法 popoverPresentationControllerDidDismissPopover，以重置 segmentControl 的颜色并启用 segmentedItem。

   func popoverPresentationControllerDidDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) {
   self.segmentItem.isEnabled = true
   self.segmentedControl.tintColor = savedTintColour!
   }
   

希望对您有所帮助。

关于ios - 当弹出窗口在屏幕上时，UIBarButtonItem 不会脱色/禁用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52904900/