objective-c - XCode - UIScrollView 分页不显示 subview (自动布局？)

Question

我以前做过一个使用 UIScrollView 和 Paging 的项目，但是对于这个新项目，我一直在努力解决这个问题，但无法让它工作。我认为问题可能出在 AutoLayout 上。起初我无法让分页 Action 正常工作，直到我意识到所有初始化都必须在 viewDidAppear 而不是 ViewDidLoad 中完成。

现在我已经完成了分页操作， subview 不会加载!它只会将我在 Storyboard 中设置的当前 View 推开，只显示空白背景。

请注意，此处的代码与我之前的项目几乎相同，但我无法显示第二个 View (第 2 页)。

部分代码如下:

- (void)viewDidAppear:(BOOL)animated{
self.scrollView.delegate = self;
// view controllers are created lazily
// in the meantime, load the array with placeholders which will be replaced on demand
NSMutableArray *controllers = [[NSMutableArray alloc] init];
for (unsigned i = 0; i < kNumberOfPages; i++)
{
    [controllers addObject:[NSNull null]];
}
self.viewControllers = controllers;

// a page is the width of the scroll view
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * kNumberOfPages, (scrollView.frame.size.height - 50));
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.scrollsToTop = NO;
scrollView.delegate = self;

pageControl.numberOfPages = kNumberOfPages;
pageControl.currentPage = 0;

// pages are created on demand
// load the visible page
// load the page on either side to avoid flashes when the user starts scrolling
//
[self loadScrollViewWithPage:1];
}




- (void)loadScrollViewWithPage:(int)page
{
if (page <= 0)
    return;
if (page >= kNumberOfPages)
    return;

PageOneViewController *controller = [viewControllers objectAtIndex:1];


if ((NSNull *)controller == [NSNull null])
{
    if(page == 1)
    {

        controller = [[PageOneViewController alloc] initWithRequestNumber: @"100" forID:self.idNumberFromLogin];
        [viewControllers replaceObjectAtIndex:page withObject:controller];
        CGRect frame = scrollView.frame;
        frame.origin.x = frame.size.width * 1;
        frame.origin.y = 0;
        controller.view.frame = frame;
        [scrollView addSubview:controller.view];
    }
}

}

在 PageOneViewController 中

 - (id)initWithRequestNumber:(NSString *)requestID forID: (NSString *) employeeID
{

   if (self = [super initWithNibName:@"OpenRequestCommView" bundle:nil])
   {

   }

   return self;

}

Answer 1

您可能在 Storyboard上启用了自动布局。

您可以通过在 Storyboard中选择文件检查器并取消选中“使用自动布局”来禁用自动布局。