目标 C:是否可以通过一个类拦截所有用户操作? [英] Objective C: is it possible to intercept all user actions by one class?

问题描述

是否可以在我的应用的所有窗口上拦截所有用户操作，例如点击、滑动、输入文本等?

解决方案

就像我在评论中所说的，子类 UIApplication 并覆盖实例方法 sendEvent:.

来自 文档，-sendEvent: 方法:

<块引用>

讨论

如果需要，可以通过以下方式拦截传入的事件子类化 UIApplication 并覆盖此方法.对于每个事件你拦截，你必须通过调用[super sendEvent:event]来调度它在您的实现中处理事件之后.

所以，它看起来像这样:

CustomUIApplication.h:

@interface CustomUIApplication:UIApplication- (void)sendEvent:(UIEvent *)event;@结尾

CustomUIApplication.m:

@implementation CustomUIApplication- (void)sendEvent:(UIEvent *)event{//...做你的事...[超级发送事件:事件];}@结尾

当然，您需要确保使用您的子类而不是默认的UIApplication.这是关于如何在 Objective-C 中执行此操作的 Stack Overflow 答案，以及 这里是 Swift.

Is it possible to intercept all user actions like tap, swipe, enter text, etc. on all windows of my app?

解决方案

Like I said in the comments, subclass UIApplication and override the instance method sendEvent:.

From the documentation for the UIApplication class, -sendEvent: method:

Discussion

If you require it, you can intercept incoming events by subclassing UIApplication and overriding this method. For every event you intercept, you must dispatch it by calling [super sendEvent:event] after handling the event in your implementation.

So, it would look like this:

CustomUIApplication.h:

@interface CustomUIApplication:UIApplication
- (void)sendEvent:(UIEvent *)event;
@end

CustomUIApplication.m:

@implementation CustomUIApplication

- (void)sendEvent:(UIEvent *)event
{
    // ...Do your thing...

    [super sendEvent:event];
}
@end

Of course, you need to make sure your subclass is used instead of the default UIApplication. Here is a Stack Overflow answer on how to do it in Objective-C, and here in Swift.

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