使用手势控制

1,  UIPanGestureRecognizer*    _panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGestureRecognizer:)];

2,  - (void)handlePanGestureRecognizer:(UIPanGestureRecognizer *)gesture{

    UIGestureRecognizerState state = [gesture state];

    CGPoint translation = [gesture translationInView:self];

    UIView *gestureView= [gesture view];

        //通过计算偏移量来设定draggableObj的新坐标        现在设置成只能左右滑动,

        [gestureView setCenter:CGPointMake(gestureView.center.x + translation.x, gestureView.center.y)];

    

    if (state == UIGestureRecognizerStateBegan) {

        NSLog(@"开始");

    }

    else if (state == UIGestureRecognizerStateBegan || state == UIGestureRecognizerStateChanged) {

        NSLog(@"滑动中");

        CGPoint center = CGPointMake(self.contentView.center.x + translation.x, self.contentView.center.y);

        [self.contentView setCenter:center];

        

        //初始化sender中的坐标位置。如果不初始化，移动坐标会一直积累起来。

        [gesture setTranslation:CGPointMake(0, 0) inView:gesture.view];

        

        [self animateWithOffset:CGRectGetMinX(self.contentView.frame)];

    }

    else if (state == UIGestureRecognizerStateEnded || state == UIGestureRecognizerStateCancelled) {

        NSLog(@"结束");

}

}