执行两指滑动手势时禁用集合视图默认平移手势答案

【问题标题】：Make collection view default pan gesture disabled when two finger swipe gesture executed执行两指滑动手势时禁用集合视图默认平移手势
【发布时间】：2015-02-26 17:14:43
【问题描述】：

请帮我解决以下情况。

Self.view（此处添加了滑动手势）
子视图中的 UicollectionView 对象（默认平移，滑动手势）
想要禁用 2 指滑动事件的滚动视图滚动/failCollectionViewPan 手势
表示如果执行 2 根手指滑动，集合视图将不会滚动

另一种方法是在使用 2 个手指时禁用集合视图滚动。在这里，我不想在两指滑动时滑动收藏视图。

我已经实现了这段代码，但它会减慢滚动速度。

[self.collectionView.panGestureRecognizer shouldBeRequiredToFailByGestureRecognizer:_swipeL];

然后我实现了下面的代码

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
     return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
     return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
     return YES;
}

现在，Swipe 和 Scroll 两者协同工作。

然后，我尝试了以下方式，但仍然没有解决。

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

if([gestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]]){
    if(gestureRecognizer.numberOfTouches==2){

        if( [[otherGestureRecognizer.view class] isSubclassOfClass:[UITableViewCell class]] ||
           [NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UITableViewCellScrollView"] ||
           [NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UITableViewWrapperView"] || [NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UIScrollViewPanGestureRecognizer"] || [NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UIScrollViewPagingSwipeGestureRecognizer"])
        {
            NSLog(@"Allow&Disable %@", [otherGestureRecognizer description]);
            [gestureRecognizer requireGestureRecognizerToFail:otherGestureRecognizer];

            return NO;
        }
    }
}
return YES;

}

我还实现了以下 2 种方法来修复它但失败了。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer NS_AVAILABLE_IOS(7_0);
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer NS_AVAILABLE_IOS(7_0);

它可以通过这种方式修复 ScrollView，但同样的方式不适用于 UICollectionView。因为，集合视图的默认平移手势，它无法修改。以这种方式尝试时，应用程序崩溃了。

【问题讨论】：

标签： ios iphone uicollectionview uigesturerecognizer uiswipegesturerecognizer

【解决方案1】：

如果您想检测平移手势，请尝试这样的操作。但是你需要识别平移手势的方向：

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
    panGesture.delegate = self;
    [self.yourCollectionView addGestureRecognizer:panGesture];
}

- (void)panGesture:(UIPanGestureRecognizer *)gesture;
{
    if (gesture.numberOfTouches == 2) {
        NSLog(@"Two fingers pan gesture");
    }
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]
            && gestureRecognizer.numberOfTouches == 2) {
        return NO;
    }
    return YES;
}

您对 UISwipeGestureRecognizer 的问题是，它比 UIPanGesture 触发晚，因此在 shouldRecognizeSimultaneouslyWithGestureRecognizer 委托调用中，滑动手势始终为 otherGestureRecognizer，而 UIPanGesture 始终为 gestureRecognizer，在此功能中您只能禁用 @ 987654325@...

更新：另一种解决方案：使用另一个 UIPanGestureRecognizer 禁用滚动平移手势：

- (void)viewDidLoad
{
    [super viewDidLoad];
    UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];
    swipeGesture.direction = UISwipeGestureRecognizerDirectionDown;
    swipeGesture.delegate = self;
    swipeGesture.numberOfTouchesRequired = 2;

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:nil];
    panGesture.delegate = self;
    [self.tableView addGestureRecognizer:panGesture];
    [self.tableView addGestureRecognizer:swipeGesture];
}

- (void)swipeGesture:(UIPanGestureRecognizer *)gesture;
{
    NSLog(@"Two fingers swipe gesture");
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]
            && gestureRecognizer.numberOfTouches == 2) {
        return NO;
    }

    return YES;
}

【讨论】：

【解决方案2】：

这个答案可能会迟到，但我今天确实遇到了类似的问题并且找不到解决方案，直到我自己弄清楚了一些事情。其实很简单。

斯威夫特 5

我们创建一个手势

    let gesture = UIPanGestureRecognizer(target: self, action: #selector(functionCall))
    gesture.minimumNumberOfTouches = 2
    gesture.maximumNumberOfTouches = 2

然后我们将该手势分配给 collectionView，从而有效地覆盖其上的滚动手势。

    collectionView.addGestureRecognizer(gesture) // simply overwrites the 2 finger gesture on the collectionView

现在可以用 1、3 或更多手指滚动 collectionView，但 2 指平移手势被阻止。

【讨论】：