“Failed to receive system gesture state notification before next touch”

iPad触控错误解析

最新推荐文章于 2020-11-22 19:17:00 发布

转载最新推荐文章于 2020-11-22 19:17:00 发布 · 1.1w 阅读

本文探讨了一种在iPad上出现的特殊 UIScrollView 触控错误，该错误与系统未能及时处理大量触控事件有关。文中提到，即使应用程序未使用手势识别器，iOS 的多任务手势仍可能导致此问题。通过关闭多任务手势或减少触控输入的数量可以解决此问题。

转载自: http://stackoverflow.com/questions/23452651/failed-to-receive-system-gesture-state-notification-before-next-touch

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I have an app with an app with a UIScrollView. I am letting IOS handle all the I/O (i.e., no gesture recognizers).

I have a cat that likes playing on the iPad and she is able to manipulate the scroll view in such a way that it gets the error in the title.

I have seen this mentioned in other posts where there were pinch guested recognizer.

What would be causing this in the absence of one? What does it mean?

I don't know what the cat does to cause this. She can do it nearly on demand. I can't do it at all.

Switch off Multitasking Gestures. This can be done in the Settings panel.

iOS 7 adds support for gestures which allow you to control audio or consult the calendar. You do not need to add gesture recognizers of your own; the OS brings them in all by itself. They also cannot be disabled from within the app.

Now for what I suspect is the reason for the messages: It seems your cat is sending so many touch events to the touch recognizer that it is overloaded. This is in essence what the error message means. It could not process all touch events in a timely manner. After all, a cat has four paws ...

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