Question

我正在使用10个自定义视图实现水平滚动视图，每个视图都有不同的UI。当用户向左滚动时，我滚动到下一个视图，在右滚动到上一个视图，它工作正常，直到现在。在某些情况下，我必须限制左滚动并只启用右滚动。在下面的方法中我得到了禁用右滚动的方案

-(void)scrollEnabled:(BOOL)scrollEnable
{
    self.scrollView.scrollEnabled = scrollEnable;
    // scrollEnable comes NO at some conditions here i have to disable the right scrolling.
    if(!scrollEnable)
    {
        // Now i am registering the pan gesture and detecting the right swiping
        UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(detectRightScroll:)];
        [self.panView addGestureRecognizer:panGesture];

    }
}

- (void) detectRightScroll:(UIPanGestureRecognizer *)gesture {

    CGPoint translation = [gesture translationInView:gesture.view];
    if(translation > 0) // here detecting the right scrolling and changing the scrollview content offset
    {
        [scrollView setContentOffset: CGPointMake(scrollView.contentOffset.x-translation, 0)];
        view is scrolling but not scrolling like scrooview
    }
}

我们可以在不注册手势的情况下达到我的要求。我在过去的4天里遇到了这个问题，但无法解决。任何帮助都可以得到赞赏。感谢。

Answer 1

如果方向错误（或禁用该方向），请尝试重置contentOffset UIScrollView

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView.contentOffset.x > stopPosition) { // or (scrollView.contentOffset.x < stopPosition)
        [scrollView setContentOffset:CGPointMake(stopPosition, 0)];
    }
}

Answer 2

尝试使用

 scrollViewDidEndDecelerating:(UIScrollView )scrollView and - (void)scrollViewDidEndDragging:(UIScrollView )scrollView willDecelerate:(BOOL)decelerate

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

        int xFinal = self.yourScroll.contentOffset.x ;
        int viewIndex = xFinal / (yourImageSize);
        xFinal = viewIndex *  yourImageSize ;
        [self.yourScroll setContentOffset:CGPointMake(xFinal, 0) animated:YES];
}




- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
        int xFinal = self.yourScroll.contentOffset.x  ;
        int viewIndex = xFinal / yourImageSize ;
         xFinal = viewIndex *  yourImageSize;
        [self.yourScroll setContentOffset:CGPointMake(xFinal, 0) animated:YES];
}

并且您只能在图像数组计数的限制内滚动。

在某些情况下禁用右侧的scrollview

2 个答案: