我正在关注这个教程https://jeevatamil.medium.com/how-to-create-share-sheet-uiactivityviewcontroller-in-swiftui-cef64b26f073 https://jeevatamil.medium.com/how-to-create-share-sheet-uiactivityviewcontroller-in-swiftui-cef64b26f073
向我的 swiftui 应用程序添加一个简单的共享表。它在 iPhone 上运行正常，但在 iPad 上崩溃并出现此错误
Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<UIPopoverPresentationController: 0x107d95ee0>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.'
有什么办法可以解决这个错误吗？不太确定这里发生了什么。谢谢！
你只需要设置sourceView and sourceRect on the UIActivityViewController's popoverPresentationController。这是一个比我迄今为止看到的更完整和正确的示例：
// Get a scene that's showing (iPad can have many instances of the same app, some in the background)
let activeScene = UIApplication.shared.connectedScenes.first(where: { $0.activationState == .foregroundActive }) as? UIWindowScene
let rootViewController = (activeScene?.windows ?? []).first(where: { $0.isKeyWindow })?.rootViewController
// iPad stuff (fine to leave this in for all iOS devices, it will be effectively ignored when not needed)
activityVC.popoverPresentationController?.sourceView = rootViewController?.view
activityVC.popoverPresentationController?.sourceRect = .zero
rootViewController?.present(activityVC, animated: true, completion: nil)
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