如何响应UIWindow中的触摸事件？

问题描述

是否可以在app Delegate或其他任何地方处理关键UIWindow中的触摸事件？

Is it possible to handle touch events in the key UIWindow in the app Delegate or anywhere else?

请提供任何帮助。

推荐答案

在 UIWindow 中有一个方便的catch-all方法，名为 sendEvent ：，它可以看到事件处理管道开始附近的每个事件。如果你想做任何非标准的额外事件处理，这是一个放置它的好地方。这样的事情：

There is a handy catch-all method in UIWindow called sendEvent: which sees every event near the start of the event-handling pipeline. If you want to do any non-standard additional event handling, this is a good place to put it. Something like this:

- (void)sendEvent:(UIEvent *)event {
  if ([self eventIsNoteworthy:event]) [self extraEventHandling:event];
  [super sendEvent:event];  // Apple says you must always call this!
}

文档： |

还提到了如何覆盖 hitTest：withEvent：以捕获一些事件，然后将它们绑定到视图层次结构中的目标叶子视图。如果需要，您还可以在 UIWindow 对象上覆盖该方法。

This blog post also mentions how to override hitTest:withEvent: to catch some events before they're bound to the target leaf subview in the view hierarchy. You can also override that method on your UIWindow object if you want.

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