检测晃动的三种方法

http://stackoverflow.com/questions/150446/how-do-i-detect-when-someone-shakes-an-iphone

我的实现（基于Eran Talmor）：

没必要application.applicationSupportsShakeToEdit = YES;

• Set the applicationSupportsShakeToEdit property in the App's Delegate:

- (void)applicationDidFinishLaunching:(UIApplication *)application {

        application.applicationSupportsShakeToEdit = YES;

        [window addSubview:viewController.view];
        [window makeKeyAndVisible];
}

• Add/Override canBecomeFirstResponder, viewDidAppear: and viewWillDisappear: methods in your View Controller （这个View controller必须是顶层的）:

-(BOOL)canBecomeFirstResponder {
    return YES;
}

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self becomeFirstResponder];
}

- (void)viewWillDisappear:(BOOL)animated {
    [self resignFirstResponder];
    [super viewWillDisappear:animated];
}

• Add the motionEnded or motionBegan method to your View Controller (模拟器中响应motionBegan, motionEnded，但真实机器iphone4中只能响应motionBegan):

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (motion == UIEventSubtypeMotionShake)
    {
        // your code
    }
}