-(BOOL)canBecomeFirstResponder
{
    return YES;
}


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


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

#pragma mark - 实现相应的响应者方法
/** 开始摇一摇 */
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"motionBegan");
    
    CGFloat offset = self.bg.height/2;
    CGFloat duration = 0.4;

    [UIView animateWithDuration:duration animations:^{
        self.up.y -= offset;
        self.down.y += offset;
    }];
    
    
    [LZAudioTool playMusic:@"dance.mp3"];
}

/** 摇一摇结束（需要在这里处理结束后的代码） */
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    // 不是摇一摇运动事件
    if (motion != UIEventSubtypeMotionShake) return;
    
    NSLog(@"motionEnded");
    CGFloat offset = self.bg.height / 2;
    CGFloat duration = 0.4;
    [UIView animateWithDuration:duration animations:^{
        self.up.y += offset;
        self.down.y -= offset;
    }];
    
}

/** 摇一摇取消（被中断，比如突然来电） */
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"motionCancelled");
}