Swift-Popover控制器显示在错误的角落，具体取决于加载时间

Question

我最近开始遇到一个问题，即弹出窗口控制器有时会显示在错误的角落。当其正常工作时，弹出源是位于右上角的按钮。这就是大多数时候发生的情况。现在，当我从特定路线“太快”着陆到此页面时，弹出窗口显示在左上角。

另一件事很奇怪，当人为地延迟加载时（例如当我设置调试点时），弹出窗口会正确显示。

因为这似乎是一个计时问题，所以我尝试将导航配置从viewDidLoad移到viewDidAppear，但这没有用。

此函数从viewDidLoad调用：

func configureNav() {

        if canAddDoc == true {
            let customButton = UIButton(type: .system)
            customButton.setImage(with: .add, tintColor: UIColor.white, imageEdgeInsets: UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10))
            customButton.addTarget(self, action: #selector(showAddDocSheet), for: .touchUpInside)
            addButton = UIBarButtonItem(customView: customButton)
        }

        shareButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.action,
                                      target: self,
                                      action: #selector(shareButtonPressed))
        navigationItem.rightBarButtonItems = (addButton == nil) ? [shareButton!] : [shareButton!, addButton!]

        @objc func showAddDocSheet() {
            guard let addButton = addButton else { return }
            self.displayActionSheet(sourceButton: addButton)
        }

    }

func displayActionSheet(sourceButton: UIBarButtonItem) {

    let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

     //Action sheet code goes here


    if let popoverController = actionSheet.popoverPresentationController {
        popoverController.barButtonItem = sourceButton
        popoverController.sourceView = sourceButton.customView
        popoverController.permittedArrowDirections = .up
    }

    self.present(actionSheet, animated: true, completion: nil)

}

Answer 1

这听上去很奇怪，但是我之前也发生过类似的事情，并且在呈现VC时将动画设置为false时，它就解决了，

self.present(actionSheet, animated: false, completion: nil)