iOS13:PopoverPresentationController - 箭头侧的边框缺失

Question

与本文主题相同: ios13 UIPopoverViewController showing UITableViewController - Safe Area problems / Missing parts of table

但就我而言，它不是特别是 UITableViewController，因为 iPad 上弹出窗口中的任何 View Controller 自 iOS13 以来都存在相同的问题。

我对重叠内容没问题，只是边框。

App screenshot

let popoverContent = self.storyboard!.instantiateViewController(withIdentifier: controllerName) as! SelectSceneViewController
popoverContent.preferredContentSize = CGSize(width: 700,height: 500)

let nav = UINavigationController(rootViewController: popoverContent)
nav.modalPresentationStyle = UIModalPresentationStyle.popover
nav.navigationBar.barStyle = navbarStyle
nav.view.layer.cornerRadius = 10
nav.view.layer.borderColor = UIColor.white.cgColor
nav.view.layer.borderWidth = 2

let popover = nav.popoverPresentationController
popover?.sourceView = button
popover?.sourceRect = button.bounds

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

Answer 1

我找到了答案。我必须实现我自己的 UIPopoverBackgroundView。示例:https://github.com/mattneub/Programming-iOS-Book-Examples/blob/master/bk2ch09p476popovers/ch22p751popovers/MyPopoverBackgroundView.swift

Andrew Shepard 实现了一个很棒的 UIPopoverBackgroundView:

https://gist.github.com/andyshep/6240110 https://andyshep.org/2013/08/2013-08-10-implementing-drawrect-on-uipopoverbackgroundview/