问题
Apple annonced Shake API in iPhone SDK 3.0. I can not find any information regarding this new feature.
Who knows about how to use it? Any example, link will be good.
回答1:
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;
Generally you just implement this:
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (event.type == UIEventSubtypeMotionShake) {
//Your code here
}
}
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:.
回答2:
I posted a complete 3.0 example in this thread:
How do I detect when someone shakes an iPhone?
回答3:
Joe Hewitt recently committed some code to Three20 that utilizes the 3.0 shake event. Seems like you just need to implement some simple code within -motionBegan:withEvent: inside of your UIResponder.
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (event.type == UIEventSubtypeMotionShake) {
...
}
}
来源：https://stackoverflow.com/questions/1170917/how-to-use-shake-api-in-iphone-sdk-3-0