ios – 无法分配类型'(String！,Bool,[AnyObject]！,NSError！) – > Void的值为UIActivit

我的项目中有以下几行代码……

@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)
        }
    }
}

我不断收到编译器错误“无法分配类型的值'(String！,Bool,[AnyObject]！,NSError！) – > Void’到’UIActivityViewControllerCompletionWithItemsHandler？’”类型的值,引用下面的代码行…

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

任何建议,将不胜感激.

你的类型签名与UIActivityViewControllerCompletionWithItemsHandler的定义不匹配,它是(String？,Bool,[AnyObject] ?, NSError？) – >虚空.用？s替换你的！它应该可以正常工作.