UIScrollView 中的 UIScrollView 问题

Question

我的故事板中有一个UIScrollView，它可以垂直滚动。在这个滚动视图内部，我以编程方式创建了一个水平的UIScrollView。

垂直的scrollView称为scroller。水平的 UIScrollView 称为 scrollInfo。由于某种原因，我无法在使用水平滚动信息时注册。关于为什么这不起作用的任何想法？

这是在我看来DidLoad：

scrollInfo = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 
155,self.view.frame.size.width, self.view.frame.size.height/4)];
//This will create a scrollview of device screen frame

scrollInfo.scrollEnabled = YES;

NSInteger numberOfViews = 3;
for (int i = 0; i < numberOfViews; i++) {
    CGFloat xOrigin = i * self.view.frame.size.width;
    UIView *awesomeView = [[UIView alloc] initWithFrame:CGRectMake(xOrigin, 0, 
    self.view.frame.size.width, self.view.frame.size.height/4)];
    awesomeView.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5 
    alpha:1];
    [scrollInfo addSubview:awesomeView];
}

// 3 views added horizontally to the UIScrollView by using xOrigin.

scrollInfo.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews, 
self.view.frame.size.height/4);

[scroller addSubview:scrollInfo];
//Add scrollview to viewcontroller

scrollInfo.pagingEnabled = YES;

pageControl = [[UIPageControl alloc] init]; //SET a property of UIPageControl
pageControl.frame = CGRectMake(0,200,self.view.frame.size.width, 
self.view.frame.size.height/8);
pageControl.numberOfPages = 3; //as we added 3 diff views
pageControl.currentPage = 0;
[scroller addSubview:pageControl];

这是我的scrollViewDidScroll 方法：

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

    if ([mainTableView isEqual: scrollView]) {

        if (mainTableView.contentOffset.y > 0) {
            // yourTableView is not on top.
            NSLog(@"not top");
        }

        else {
            // yourTableView is already on top.
            NSLog(@"is top");
            [UIView animateWithDuration:0.5f delay:0 
            options:UIViewAnimationOptionCurveLinear animations:^{
                scroller.contentOffset = CGPointMake(0, 0);
            } completion:NULL];
        }
    }

    else {

        CGFloat pageWidth = self.view.frame.size.width;
        int page = floor((scrollInfo.contentOffset.x - pageWidth / 2 ) / pageWidth) + 
        1; //this provide you the page number
        pageControl.currentPage = page;// this displays the white dot as current page
        NSLog(@"page");
    }
}

Answer 1

您似乎忘记将UIScrollViewDelegate 连接到您的滚动视图。完成此操作后，您最好使用 scrollview.tag 来识别哪个滚动视图调用委托