如何在iPhone SDK 3.0中使用Shake API？ [英] How to use Shake API in iPhone SDK 3.0?

问题描述

Apple在iPhone SDK 3.0中宣布了Shake API。我找不到有关此新功能的任何信息。

Apple annonced Shake API in iPhone SDK 3.0. I can not find any information regarding this new feature.

谁知道如何使用它？任何例子，链接都会很好。

Who knows about how to use it? Any example, link will be good.

推荐答案

您要查找的API位于 UIResponder ：

The APIs you are looking for are in UIResponder:

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event;
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event;
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event;

通常你只是实现这个：

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
  if (event.type == UIEventSubtypeMotionShake) {
    //Your code here
  }
}

（UIViewController是UIResponder的子类）。另外，你想在motionEnded中处理它：withEvent：，而不是motionBegan：withEvent：。 motionBegan：withEvent：当手机怀疑正在发生晃动时被调用，但操作系统可以确定用户故意晃动和偶然震动（如走上楼梯）之间的差异。如果操作系统决定在motionBegan：withEvent：被调用后它将不会真正动摇它将调用motionCancelled：而不是motionEnded：withEvent：。

in your UIViewController subclass (UIViewController is a subclass of UIResponder). Also, you want to handle it in motionEnded:withEvent:, not motionBegan:withEvent:. motionBegan:withEvent: is called when the phone suspects shaking is happening, but the OS can determine the difference between a user purposefully shaking, and incidental shaking (like walking up the stairs). If the OS decides it was not a real shake after motionBegan:withEvent: is called it will call motionCancelled: instead of motionEnded:withEvent:.

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