Question

我正在编写一个模块，每次我在视图上滑动时，都会添加两个具有视图大小的子视图。这些子视图有自己的手势（例如：pan，...）。我第一次滑动，没关系，因为没有创建子视图。但是一旦创建了子视图，每次我滑动时，滑动手势都会传递到其子视图。 :(，所以我必须滑动2次才能分开。

我想知道有没有办法阻止滑动传递到其子视图？谢谢。

更新
我使用了shouldRecognizeSimultaneouslyWithGestureRecognizer来使这些手势同时工作。但是仍然存在一些问题。父视图具有其滑动手势，子视图具有其手势。由于我使用souldRecognizeSimultaneouslyWithGestureRecognizer，有时当我平移时，滑动手势会触发。那么，你知道在这种情况下Pan是否处于活动状态时如何禁用Swipe？

Answer 1

您必须实现UIGestureRecognizerDelegate方法：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

将控制器添加为手势识别器的代理。然后，当两个手势识别器响应手势时，将调用此方法，您可以在此处实现应用程序所需的逻辑。

在控制器的接口声明中，您必须输入：

@interface testcViewController () <UIGestureRecognizerDelegate>

然后，在创建手势识别器时：

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe)];
swipe.direction = UISwipeGestureRecognizerDirectionDown;
swipe.delegate = self;
[self.view addGestureRecognizer:swipe];

然后，最后，您将此方法添加到控制器：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    BOOL shouldInteract = NO;
    //Here you decide whether or not the two recognizers whould interact.
    return shouldInteract;
}

修改您也可以实施

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;

在这里，检测您是否已经提交了子视图，并阻止了您想要的任何手势。

Answer 2

将userinteractionEnabled设置为子视图的NO

 subview.userinteractionEnabled=NO

如果您不想禁用userInteraction，请使用cancelsTouchesInView方法

cancelsTouchesInView - 如果手势识别器识别出其手势，它从他们的视角中取消了该手势的剩余触摸（所以窗口不会传递它们）。窗口取消之前的使用（touchesCancelled：withEvent :)消息传递触摸。如果一个手势识别器无法识别其手势，视图会收到多触摸序列中的所有触摸。

Answer 3

要阻止来自超级视图的所有手势识别器，我创建了一个UIGestureRecognizer子类，它将在附加到视图时执行此操作。请参阅以下代码（取自我的WEPopover项目）：

#import "WEBlockingGestureRecognizer.h"
#import <UIKit/UIGestureRecognizerSubclass.h>

@implementation WEBlockingGestureRecognizer

- (id)init {
    return [self initWithTarget:self action:@selector(__dummyAction)];
}

- (id)initWithTarget:(id)target action:(SEL)action {
    if ((self = [super initWithTarget:target action:action])) {
        self.cancelsTouchesInView = NO;
    }
    return self;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    if (self.state == UIGestureRecognizerStatePossible) {
        self.state = UIGestureRecognizerStateBegan;
    }
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    self.state = UIGestureRecognizerStateRecognized;
}

- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer {
    return [self isGestureRecognizerAllowed:preventingGestureRecognizer];
}

- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer {
    return ![self isGestureRecognizerAllowed:preventedGestureRecognizer];
}

- (BOOL)shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return ![self isGestureRecognizerAllowed:otherGestureRecognizer];
}

- (BOOL)shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return NO;
}

- (BOOL)isGestureRecognizerAllowed:(UIGestureRecognizer *)gr {
    return [gr.view isDescendantOfView:self.view];
}

- (void)__dummyAction {

}

@end

如果要阻止附加到某些视图的父视图的所有手势识别器，请执行以下操作：

- (void)blockParentGesturesForView:(UIView *)v {
    [v addGestureRecognizer:[WEBlockingGestureRecognizer new]];
}

Answer 4

尝试这样，

   - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return NO;
}

Answer 5

考虑到我dialogView作为UIViewController主view的直接子视图，我将手势识别器附加到主{{1}并执行以下操作（将我的视图控制器设置为手势识别器view：

delegate)

Answer 6

把我在这里读到的东西做成一个对我来说很棒的Swift 5！我在一个视图中有一个滑动控件，它也有一个滑动识别器，可以移动到另一个视图。如果手指没有碰到滑块的拇指，那么整个视图就会移动。

通过将此视图放置在滑块下（展开使其更大），错过不会做任何事情。

final class BlockingView: UIView, UIGestureRecognizerDelegate {
    let swipe: UISwipeGestureRecognizer = UISwipeGestureRecognizer();

    init() {
        super.init(frame: CGRect.zero)

        swipe.direction = [.left, .right]
        self.addGestureRecognizer(swipe)
    }
    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    @objc override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool { return false }
}

希望这可以避免麻烦！

如何阻止从superview到子视图的手势？

6 个答案: