IOS 8 iPad 应用程序在调用 UIActivityViewController 时崩溃

Question

当在这个应用的 iPhone 上调用 UIActivityViewController 时，它工作得很好，但是当在 iPad 上调用时，应用程序崩溃了。下面是我使用的代码：

func shareButtonPress() {

    //when the share button is pressed, default share phrase is added, cropped image of highscore is added

    var sharingItems = [AnyObject]()

    var shareButtonHighscore = NSUserDefaults.standardUserDefaults().objectForKey("highscore") as Int!

    sharingItems.append("Just hit \(shareButtonHighscore)! Beat it! #Swath")

    UIGraphicsBeginImageContextWithOptions(UIScreen.mainScreen().bounds.size, false, 0);
    self.view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)
    var image:UIImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    sharingItems.append(image)

    let activityViewController = UIActivityViewController(activityItems: sharingItems, applicationActivities: nil)

    var barButtonItem: UIBarButtonItem! = UIBarButtonItem()

    activityViewController.excludedActivityTypes = [UIActivityTypeCopyToPasteboard,UIActivityTypeAirDrop,UIActivityTypeAddToReadingList,UIActivityTypeAssignToContact,UIActivityTypePostToTencentWeibo,UIActivityTypePostToVimeo,UIActivityTypePrint,UIActivityTypeSaveToCameraRoll,UIActivityTypePostToWeibo]

    self.presentViewController(activityViewController, animated: true, completion: nil)

}

如您所见，我在 Swift 中，在 SpriteKit 框架中编程，但我不明白应用崩溃的原因。

我收到这个错误：

Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<_UIAlertControllerActionSheetRegularPresentationController: 0x7fc7a874bd90>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.'

我该怎么做才能解决这个问题？

Answer 1

如果您阅读了错误，它说明了如何修复它，您需要设置 barButtonItem 或 sourceView 来显示弹出窗口，在您的情况下：

func shareButtonPress(pressedButton: UIBarButtonItem) { 

    ...

    activityViewController.popoverPresentationController.barButtonItem = pressedButton

    self.presentViewController(activityViewController, animated: true, completion: nil)
}

Answer 2

在呈现UIActivityViewController之前，添加这行代码：

activityViewController.popoverPresentationController?.sourceView = self.view

这样，视图控制器就知道出现在 GameViewController 的哪个帧中。

Answer 3

有两个选项，动作来自 UIBarButtonitem 或 UIView 的 UIButton。

func shareButtonPress() {

    ...

    if let actv = activityViewController.popoverPresentationController {
        actv.barButtonItem = someBarButton // if it is a UIBarButtonItem

        // Or if it is a view you can get the view rect
        actv.sourceView = someView
        // actv.sourceRect = someView.frame // you can also specify the CGRect
    }

    self.presentViewController(activityViewController, animated: true, completion: nil)
}

您可能需要向函数添加发件人，例如 func shareButtonPress(sender: UIBarButtonItem) 或 func shareButtonPress(sender: UIButton)

Answer 4

我添加了 Swift 3:

activityViewController.popoverPresentationController?.sourceView = self.view

解决了我的问题。

Answer 5

Swift 5:

检查设备是 iPhone 还是 iPad 并在此基础上添加 sourceView 并显示 activityController

let activity = UIActivityViewController(activityItems: [self], applicationActivities: nil)
if UIDevice.current.userInterfaceIdiom == .phone {
    UIApplication.topViewController?.present(activity, animated: true, completion: nil)
} else {
    activity.popoverPresentationController?.sourceView = UIApplication.topViewController!.view
    UIApplication.topViewController?.present(activity, animated: true, completion: nil)
}

IOS 8 iPad 应用程序在调用 UIActivityViewController 时崩溃

IOS 8 iPad App Crashes When UIActivityViewController Is Called

swift

ios8

crash

sprite-kit

uiactivityviewcontroller