无法为类型'（String！，Bool，[AnyObject]！，NSError！） - > Void赋值为UIActivityViewControllerCompletionWithItemsHandler类型的值？'

我的代码在我的项目下面的行...无法为类型'（String！，Bool，[AnyObject]！，NSError！） - > Void赋值为UIActivityViewControllerCompletionWithItemsHandler类型的值？'

@IBAction func shareMeme(sender: UIBarButtonItem) { 

    let newMeme = save() 
    let memedImage = newMeme.memedImage 
    let activityViewController = UIActivityViewController(activityItems: [memedImage], applicationActivities: nil) 

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

    activityViewController.completionWithItemsHandler = {(type: String!, completed: Bool, returnedItems: [AnyObject]!, error: NSError!) -> Void in 

     dispatch_async(dispatch_get_main_queue()){ 
      self.presentingViewController?.dismissViewControllerAnimated(true, completion: nil) 
     } 
    } 
}

我不断收到一个编译器错误“不能指定类型的值“（字符串！BOOL，[AnyObject]！NSError！） - >空”到类型值‘UIActivityViewControllerCompletionWithItemsHandler’”指的是下面的代码行...

activityViewController.completionWithItemsHandler = {(type: String!, completed: Bool, returnedItems: [AnyObject]!, error: NSError!) -> Void in

任何建议，将不胜感激？。

来源

2015-09-16 ssk

您的类型签名与UIActivityViewControllerCompletionWithItemsHandler的定义不符，即(String?, Bool, [AnyObject]?, NSError?) -> Void。用?代替! s，它应该可以正常工作。

来源

2015-09-16 02:38:45 jtbandes

与SWIFT 3.0签名应该是

activityViewController.completionWithItemsHandler = { (activity: UIActivityType?, completed: Bool, returnedItems: [Any]?, error: Error?) in

如this post

所示

来源

2016-09-19 18:39:27 toddg

无法为类型'（String！，Bool，[AnyObject]！，NSError！） - > Void赋值为UIActivityViewControllerCompletionWithItemsHandler类型的值？'

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