UIScrollView如何与StoryBoard一起工作并显示不同的UIViewControllers

Question

我有一个情节提要。其中有一个UIViewController，我在上面放了UIScrollView和UIPageControl。在每个页面上（假设我有3个），我都试图加载一个UIViewController（显示不同的标签和表值）。

问题-我可以加载所有内容，但标签和表不可见。当我试图改变每一页的背景颜色时，它确实会改变。我研究了各种帖子和代码，但似乎没有什么效果/显示带有StoryBoard的UIScrollView（UIViewController显示标签和表格）。

我是你可以通过加载一个单独的XIB文件来做到这一点，但随后整个片段被中断。请参阅下面的代码。

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
//ScrollView and PageControl
// Create view controllers placeholder array
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (int i = 0; i < numberOfPages; i++) 
{
    [controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;    
// Set Scroll View
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * numberOfPages, scrollView.frame.size.height);
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.scrollsToTop = NO;
scrollView.delegate = self; 
// Set Page Control
pageControl.numberOfPages = numberOfPages;
pageControl.currentPage = 0;
// Load the visible and next page
[self loadScrollViewWithPage:0];
[self loadScrollViewWithPage:1];
}
- (void)scrollViewDidScroll:(UIScrollView *)sender
{
if (pageControlUsed)
{
    // To know if scroll is valid - from Page Control
    return;
}
// Changes Page Control indicator
CGFloat pageWidth = scrollView.frame.size.width;
int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
pageControl.currentPage = page;
// Load the visible, previous and next pages
[self loadScrollViewWithPage:page - 1];
[self loadScrollViewWithPage:page];
[self loadScrollViewWithPage:page + 1];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView 
{
pageControlUsed = NO;
}
- (void)loadScrollViewWithPage:(int)page
{
if (page < 0) return;
if (page >= numberOfPages) return;
// Load new Controller
ReportsDetailViewController *controller = [viewControllers objectAtIndex:page];
if ((NSNull *)controller == [NSNull null]) 
{
    controller = [[ReportsDetailViewController alloc] init];
    controller.pageNumber = [NSNumber numberWithInt:page];
    [viewControllers replaceObjectAtIndex:page withObject:controller];
}   
if (nil == controller.view.superview) 
{
    CGRect frame = scrollView.frame;
    frame.origin.x = frame.size.width * page;
    frame.origin.y = 0;
    controller.view.frame = frame;
    [scrollView addSubview:controller.view];
}
}

Answer 1

尝试创建这样的ViewControllers:

YourViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"YourViewController"];

您可以在属性检查器中设置视图控制器的标识符。

我今天也遇到了同样的问题，这对我来说很有用。