UIActivityViewController callback
//保存图片
func savePhoto(){
itemsToShare=[AnyObject]()
let imageData=UIImagePNGRepresentation(self.phoneImageView.image!)
self.itemsToShare.append(UIImage(data: imageData!)!)
let activityViewController = UIActivityViewController(activityItems: itemsToShare, applicationActivities: nil)
let completionItems: UIActivityViewControllerCompletionWithItemsHandler = { (activityType: String?, completed: Bool, returnedItems: [AnyObject]?, activityError: NSError?) -> Void in
if completed == true {
self.navigationController?.navigationBar.backgroundColor=UIColor.redColor()
self.dismissViewControllerAnimated(true, completion: nil)
}
}
activityViewController.completionWithItemsHandler=completionItems
presentViewController(activityViewController, animated: false, completion: nil)
}
```
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