Ios 当屏幕上显示popover时，UIBarButtonItem未脱色/禁用

我的导航控制器上有两个

uibarbuttonims

：

    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，我会：

@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

函数：

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

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

即使我将

passthroughview

设置为

nil

两次，但在弹出式按钮显示在屏幕上时，

UISegmentedControl

不会脱色并保持可点击状态

如果在

UISegmentedControl

上显示任何其他POP，则其行为正常：脱色且不可点击

---

我在这里遗漏了什么？

看看你的代码，一切似乎都很好。似乎操作系统中有一个bug

我已经找到了一个快速修复方法，除非他们在下一个iOS版本中检查并修复它

定义barButtonItems和变量，以便在ViewController中全局保存现有的着色颜色

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

在

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]

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)
}

实施委托方法

prepareforpoverpresentation

并将色调颜色设置为darkGray，并将以前可用的色调颜色保存为一个变量，以便在启用时可以重用该变量

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
}

执行委托方法

popoverPresentationControllerDidDismissPopover

，以重置segmentControl的颜色并启用segmentedItem

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

希望能有所帮助。

正如所建议的，模仿iOS操作是一种有效的解决方法。他的回答很接近，但遗漏了一些细节：

• 调用

  PopOverpresentationControllerdDismissPopover

  太晚，导致分段控件在所有其他UI元素之后再次变为蓝色。需要改用

  PopOverpresentationControllersAddIsmissPopOver

• 颜色变化需要设置动画，就像在iOS中一样

• segmentedControl

  的

  isEnabled

  也必须保存
• 在禁用状态下处理较浅颜色

以下是我所做的，希望找到更好的解决方案：

private var segmentedControlTintColor: UIColor?
private var segmentedControlIsEnabled: Bool = true

// Due to, what seems to be, an iOS issue, the segmented control is not decolorized when the info popover is
// on screen.  The two functions below mimick iOS behavior until a better solution is found.
func decolorizeSegmentedControl()
{
    segmentedControlIsEnabled = segmentedControl.isEnabled
    segmentedControl.isEnabled = false
    segmentedControlTintColor = segmentedControl.tintColor
    UIView.animate(withDuration: 0.333)
    {
        self.segmentedControl.tintColor = self.segmentedControlIsEnabled ? .darkGray : .lightGray
    }
}

func colorizeSegmentedControl()
{
    segmentedControl.isEnabled = segmentedControlIsEnabled
    UIView.animate(withDuration: 0.333)
    {
        self.segmentedControl.tintColor = self.segmentedControlTintColor
    }
}

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

    decolorizeSegmentedControl()
}

func popoverPresentationControllerShouldDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) -> Bool
{
    colorizeSegmentedControl()

    return true
}

---

我知道如何假装这种行为，但这正是我现在要寻找的。是的，但没有其他选择来克服这个问题。你可以假装这种行为，也可以联系苹果来解决这个问题。如果您的情况允许修改UI，您可以通过将segment控件设置为LeftBarButtonim来做更多的事情。：）正如你所说，目前还没有其他答案（我想如果没有更好的/真正的解决方案出现的话）。