ios 在带有 Storyboard 的 XCode 4 中以模态方式推送视图时出现“不平衡调用开始/结束外观转换”警告
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"Unbalanced calls to begin/end appearance transitions" warning when push a view in a modal way in XCode 4 with Storyboard
提问by Vinestro
After some research on the web without success, I come here to ask you the question about my warning.
在网络上进行了一些研究但没有成功后，我来到这里向您询问有关我的警告的问题。
Actually, I have a view V1 with a navigation controller and I want to push a modal view V2 when V1 has finished loading.
So I use the performSegueWithIdentifiermethod (I'm using storyboard).
Here is my code:
实际上，我有一个带有导航控制器的视图 V1，我想在 V1 加载完成后推送一个模态视图 V2。所以我使用该performSegueWithIdentifier方法（我正在使用故事板）。这是我的代码：
[self performSegueWithIdentifier:@"showConnexionViewSegue" sender:self];
And when I compile, I got this warning:
当我编译时，我收到了这个警告：
Unbalanced calls to begin/end appearance transitions for <UINavigationController: 0x6849b30>
Can anyone help me?
谁能帮我？
回答by Mark Adams
It sounds like you may be performing the segue in -viewWillAppear:thus generating two -viewWillAppear:messages without 2 corresponding -viewDidAppearmessages.
听起来您可能正在执行 segue-viewWillAppear:从而生成两条-viewWillAppear:消息而没有 2 条相应的-viewDidAppear消息。
Try performing the segue in -viewDidAppear.
尝试在-viewDidAppear.
回答by infiniteLoop
'Unbalanced calls to begin/end appearance transitions for '
'开始/结束外观过渡的不平衡调用'
Says an animation is started before the last related animation isnt done. So, are you popping any view controller before pushing the new one ? Or may be popping to root ? if yes try doing so without animation i.e. [self.navigationController popToRootViewControllerAnimated:NO];
说动画在最后一个相关动画未完成之前开始。那么，在推送新的视图控制器之前，您是否弹出任何视图控制器？或者可能会弹出到 root ？如果是，请尝试在没有动画的情况下这样做，即 [self.navigationController popToRootViewControllerAnimated:NO];
And see if this resolves the issue, In my case this did the trick.
看看这是否解决了问题，在我的情况下，这解决了问题。
回答by DonnaLea
I had this problem, but what I had done is on a UIViewControllerI had linked a Segue from a UIButtonand also coded it into a nextBtnPressed:function, so I was actually pushing two new UIViewControllerson the one button press. Limiting it to just the one segue fixed it. But it took some investigating to see that I had done this double up.
我遇到了这个问题，但我所做的是在 aUIViewController上链接了一个 SegueUIButton并将其编码为一个nextBtnPressed:函数，所以我实际上是UIViewControllers在按下一个按钮时推了两个新的。将其限制为一个 segue 修复了它。但是经过一番调查才发现我已经完成了这个加倍。
回答by Anjaan
The reasons for this are manifold and are very specific to the context and the programming. For example, what I was doing was
造成这种情况的原因是多方面的，并且非常特定于上下文和编程。例如，我正在做的是
- initialising a sound file, playing it (asynchronously) for 1.4 seconds,
- making an image move across the screen using animation timed to last 1.4 seconds and,
- with a timer set to 1.4 seconds after step 2, pushing a viewcontroller.
- 初始化声音文件，（异步）播放 1.4 秒，
- 使用定时为持续 1.4 秒的动画使图像在屏幕上移动，并且，
- 在第 2 步之后将计时器设置为 1.4 秒，推动视图控制器。
What i discovered is that if I DO NOT have the instructions for these 3 steps one after the other (if I mix them up), then I get the error "Unbalanced calls...". Also, if I time the push of the viewcontroller to less than 1.4 seconds, I get the message as well.
我发现的是，如果我没有一个接一个地获得这 3 个步骤的说明（如果我将它们混在一起），那么我会收到错误“呼叫不平衡...”。此外，如果我将视图控制器的推送时间设置为小于 1.4 秒，我也会收到消息。
So, check that the sequence and timing of your program instructions are correct.
因此，请检查程序指令的顺序和时序是否正确。
