ios - 如何在单击“取消”按钮时关闭 UIActivityViewController？

Question

    let activityVC = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
    let excludeActivities = [UIActivityTypeAirDrop, UIActivityTypePrint, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, UIActivityTypeAddToReadingList, UIActivityTypePostToFlickr, UIActivityTypePostToVimeo,UIActivityTypeMail,UIActivityTypeOpenInIBooks,UIActivityTypeCopyToPasteboard]

    activityVC.excludedActivityTypes=excludeActivities
    let nav = UINavigationController(rootViewController: activityVC)
    nav.modalPresentationStyle = UIModalPresentationStyle.Popover
    let popover = nav.popoverPresentationController as UIPopoverPresentationController!
    activityVC.preferredContentSize = CGSizeMake(0,150)
    popover.sourceView = self.view
    popover.sourceRect = CGRectMake(345,580,0,0)
    self.presentViewController(nav, animated: true, completion: nil)

我试图在单击取消按钮时关闭事件 Controller ，但这不起作用。单击 Controller 外部的任意位置时，此操作会被取消，但不会通过点击取消按钮来取消。

Answer 1

就用这个

let text = String(format:"Download the app on your iPhone")

// set up activity view controller
let objectsToShare: [AnyObject] = [ text ]
self.activityViewController = UIActivityViewController(
     activityItems: objectsToShare, applicationActivities: nil)

self.activityViewController.popoverPresentationController?.sourceView = self.view
// so that iPads won't crash

self.activityViewController.completionWithItemsHandler = { activity, success, items, error in
 if success {
  // Success handling here
 }       
}
// exclude some activity types from the list (optional)
self.activityViewController.excludedActivityTypes = [ UIActivityTypeAirDrop, UIActivityTypePostToFacebook ]

// present the view controller
self.presentViewController(self.activityViewController, animated: true, completion: nil)