手势问题：UISwipeGestureRecognizer + UI滑块

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，我在同一视图中的 UISlider 玩得不好。滑块的滑动动作被误认为是向左/向右滑动。

任何人以前遇到过这个问题，有任何想法如何纠正它吗？

非常感谢。

这是视图控制器中包含的代码：

 - (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滑块上的触摸。您可以通过将自己设置为委托来做到这一点，然后实现

- (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，则滑块可能实际上具有接收触摸的子视图，因此您可以沿着 superview 链向上走，测试沿途的每一个景色。

Answer 2

斯威夫特 4.0 版本。 不要忘记 UIGestureRecognizerDelegate。

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {

    if let touchedView = touch.view, touchedView.isKind(of: UISlider.self) {
        return false
    }

    return true
}

Answer 3

在莉莉做出上述回应之前，我最终完成了这项工作。这是我使用的代码，但莉莉的看起来更干净（你还没有测试莉莉的）：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    BOOL AllowSwipes = YES;

        CGPoint point1 = [touch locationInView:_sliderLeft];
        CGPoint point2 = [touch locationInView:_sliderRight];

        //Left slider test
        if ([_sliderLeft hitTest:point1 withEvent:nil] != nil) {
            AllowSwipes = NO;
            NSLog(@"On Left Slider");
        }

        //Right slider test
        if ([_sliderRight hitTest:point2 withEvent:nil] != nil) {
            AllowSwipes = NO;
            NSLog(@"On Right Slider");
        }
    }
    return AllowSwipes;
}