Question

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)
        }
    }
}

我不断收到编译错误“无法分配类型的值'（String！，Bool，[AnyObject] !, NSError！） - ＆gt; Void'到'UIActivityViewControllerCompletionWithItemsHandler？'”类型的值，参考以下内容代码行......

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

任何建议将不胜感激。

Answer 1

您的类型签名与UIActivityViewControllerCompletionWithItemsHandler的定义不匹配，即(String?, Bool, [AnyObject]?, NSError?) -> Void。将!替换为?，它应该可以正常工作。

Answer 2

使用Swift 3.0，签名应为

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

如this post

所示

无法分配类型'（String！，Bool，[AnyObject]！，NSError！） - ＆gt; Void的值为UIActivityViewControllerCompletionWithItemsHandler类型的值？'

2 个答案: