iOS摇动方法实现

iOS对于摇动进行了封装，直接可以使用MotionEvent来实现，代码如文档中实例，

首先设置view为firstResponder

- (BOOL)canBecomeFirstResponder
{
    //默认是NO，所以得重写此方法，设成YES
     return YES;
}

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

然后实现下列方法://很像TouchEvent事件

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{

}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"shake");
}

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{

}