Question

我在UIButton Click事件监听器中执行条件segue。我的segue是在＆＃34; pathanViewController＆＃34;之间绘制的。和＆＃34; dekhunViewController＆＃34;在故事板中与＆＃34; pathanToDekhun＆＃34;标识符。但我得到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.'

点击按钮后我执行了外部api调用，成功返回消息后，我用performSegueWithIdentifier调用了segue。但是segue实际上从未发生过。下面是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

我做错了是我的performSegueWithIdentifier没有在主队列中调用。这就是它抛出异常的原因。我现在正在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“覆盖func shouldPerformSegueWithIdentifier”功能。多数民众赞成。

在swift中的条件segue中获取NSInternalInconsistencyException

1 个答案: