iphone - 手势问题: UISwipeGestureRecognizer + UISlider

Question

遇到与手势相关的问题。我实现了 UISwipeGestureRecognizer 来获取向左和向右滑动事件，并且工作正常。然而，我面临的问题是，我在同一 View 中的 UISlider 玩得不好。 slider 的滑动 Action 被误认为是向左/向右滑动。

有人以前遇到过这个问题，有什么解决办法吗？

非常感谢。

这是 View Controller 中包含的代码:

 - (void)viewDidLoad {

            [super viewDidLoad];

                //Setup handling of LEFT and RIGHT swipes
             UISwipeGestureRecognizer *recognizer;

                recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
                [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
                [[self view] addGestureRecognizer:recognizer];
                [recognizer release];

                recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
                [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
                [[self view] addGestureRecognizer:recognizer];
                [recognizer release];
        }

    -(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {

      if (recognizer.direction == UISwipeGestureRecognizerDirectionRight) {
       NSLog(@"Swipe Right");
       //Do stuff
      }

      if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
       NSLog(@"Swipe Left");
       //Do stuff
      }
    }

Answer 1

处理此问题的最简单方法可能是防止手势识别器看到 slider 上的触摸。您可以通过将自己设置为委托(delegate)人，然后实现来做到这一点

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if ([touch.view isKindOfClass:[UISlider class]]) {
        // prevent recognizing touches on the slider
        return NO;
    }
    return YES;
}

如果这不起作用，则 slider 实际上可能有接收触摸的 subview ，因此您可以沿着superview链向上走，沿途测试每个 View 。