swift - 在 swift 的条件转场中获取 NSInternalInconsistencyException

Question

我正在 UIButton Click 事件监听器中执行条件转场。我的转场是在 Storyboard中的“pathanViewController”和“dekhunViewController”之间绘制的，标识符为“pathanToDekhun”。但我收到 NsInternalInconsistencyException 为

*** Assertion failure in -[UIKeyboardTaskQueue waitUntilAllTasksAreFinished], /SourceCache/UIKit_Sim/UIKit-3318.16.14/Keyboard/UIKeyboardTaskQueue.m:374

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] may only be called from the main thread.'

单击按钮后，我执行了外部 api 调用，并在成功返回消息后，我使用 PerformSegueWithIdentifier 调用了 segue。但segue实际上从未发生过。下面是我在 pathanViewController 中的代码部分。请让我知道我做错了什么。

 @IBAction func sendBtnListener(sender: AnyObject) {
        if !self.commentSection.text.isEmpty {
            var submitVoganti = DataSerialization(brandName: self.brandName!, rating: Int(self.sliderStatus.value*5), commentText: self.commentSection.text, anonymous: switchBox.on ? true : false)
            var dataSet = DataSet()
            dataSet.postComment(submitVoganti.toJson(),{
                (id) in
                self.performSegueWithIdentifier("pathanToDekhun", sender: self)
                println(id)
            })
        } else{
            println("Comment field should not be empty")
        }
    }

    //Check whether a segue should be triggered or not
    override func shouldPerformSegueWithIdentifier(identifier: String?, sender: AnyObject?) -> Bool {
        if identifier == "pathanToDekhun" {
            return false
        }
        // by default, transition
        return true
    }

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        var dekhunScene = segue.destinationViewController as ThirdViewController
        dekhunScene.keyword = self.brandName
    }

Answer 1

我做错的是我的performSegueWithIdentifier没有在主队列中调用。这就是它抛出异常的原因。我现在所做的只是编辑我的代码，如下 -

 dataSet.postComment(submitVoganti.toJson(),{
                (id) in
                dispatch_async(dispatch_get_main_queue()){
                   self.performSegueWithIdentifier("pathanToDekhun", sender: self)
                }
                println(id)
            })

并注释掉“override func shouldPerformSegueWithIdentifier”函数。就是这样。