UIScrollView 内的 UISwipeGestureRecognizer 不会向右滑动 - Objective C

Question

我在滚动视图中使用了两个滑动手势，因此我可以更改照片和放大，向左滑动正常且流畅，而向右滑动无法正常工作，多次滑动后它可能会触发一次，我正在使用这段代码：

//image zoom
    self.scrollView.minimumZoomScale=1.0;
    self.scrollView.maximumZoomScale=6.0;
    self.scrollView.contentSize=CGSizeMake(1280, 960);
    self.scrollView.delegate=self;
    self.scrollView.clipsToBounds = YES;
    self.scrollView.scrollEnabled = false;

    UISwipeGestureRecognizer * swipeleft=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeleft:)];
    swipeleft.direction=UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipeleft];

    UISwipeGestureRecognizer * swiperight=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swiperight:)];
    swiperight.direction=UISwipeGestureRecognizerDirectionRight;
    [self.view addGestureRecognizer:swiperight];

以及这两种处理滑动的方法

-(void)swipeleft:(UISwipeGestureRecognizer*)gestureRecognizer
{
    NSLog(@"LEFTtttttt");
    if(index > 0 && index < _photoCount){
        index = index - 1;
        [self loadImage];
    }

}

-(void)swiperight:(UISwipeGestureRecognizer*)gestureRecognizer
{
       NSLog(@"RIGHTttttt");
    if(index >= 0 && index < _photoCount - 1){
        index = index + 1;
        [self loadImage];
    }
}

我当然搜索了一个解决方案并尝试了不同的代码但它不起作用，我添加了

[self.scrollView.panGestureRecognizer requireGestureRecognizerToFail:swiperight];

还有这个，

-(void)scrollViewDidZoom:(UIScrollView *)scrollView {
    if (scrollView.zoomScale!=1.0) {
        // Zooming, enable scrolling
        scrollView.scrollEnabled = TRUE;
    } else {
        // Not zoomed, disable scrolling so gestures get used instead
        scrollView.scrollEnabled = FALSE;
    }
}

唯一的区别是当我添加后一个代码时，当我放大时向右滑动正常工作，而它应该在相反的情况下工作。

我是否遗漏了代码中的某些内容？

谢谢。

Answer 1

请将滑动手势添加到不在 self.view 上的 scrollView 以使其在用户在 scrollView 上滑动时正常工作。如下所示

UISwipeGestureRecognizer * swipeleft=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeleft:)];
swipeleft.direction=UISwipeGestureRecognizerDirectionLeft;
[self.scrollView addGestureRecognizer:swipeleft];

UISwipeGestureRecognizer * swiperight=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swiperight:)];
swiperight.direction=UISwipeGestureRecognizerDirectionRight;
[self.scrollView addGestureRecognizer:swiperight];

这可能是因为滚动视图在 self.view 上方呈现。