当在此应用程序中的iPhone上调用UIActivityViewController时，它可以正常工作，但在iPad上调用时，该应用程序崩溃。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，我正在使用SpriteKit Framework在Swift中进行编程，但我不明白为什么应用程序崩溃。
我收到此错误：
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此问题？
在展示之前UIActivityViewController，添加以下代码行：
activityViewController.popoverPresentationController?.sourceView = self.view
这样，视图控制器便知道要出现在GameViewController的哪个帧中。
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