ios - 在 ScrollView 中添加现有的 View Controller

Question

我有两个 View Controller ，我想将其添加为 ScrollView 的 subview ，但是，当我添加这些 View Controller 时，仅显示第二个 Controller 。

这是我的代码。

- (void)viewDidLoad
{
    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
    [self.view addSubview:scrollView];

    [scrollView setBounces:NO];

    scrollView.pagingEnabled = YES;
    scrollView.contentSize = CGSizeMake(320*2, 460);

    controllers = [[NSMutableArray alloc] initWithCapacity:0];

    First *first = [self.storyboard instantiateViewControllerWithIdentifier:@"First"];
    [scrollView addSubview:first.view];
    [controllers addObject:first];

    Second *second = [self.storyboard instantiateViewControllerWithIdentifier:@"Second"];
    [scrollView addSubview:second.view];
    [controllers addObject:second];
}

提前致谢。

Answer 1

给你举个例子，你可以根据你的要求调整他们的框架。

- (void)viewDidLoad
{
    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
    [self.view addSubview:scrollView];

    [scrollView setBounces:NO];

    scrollView.pagingEnabled = YES;
    scrollView.contentSize = CGSizeMake(320*2, 460);

    controllers = [[NSMutableArray alloc] initWithCapacity:0];

    First *first = [self.storyboard instantiateViewControllerWithIdentifier:@"First"];
    [scrollView addSubview:first.view];
    first.view.frame = CGRectMake(0.0, 0.0, 320.0, 460.0) ;
    [controllers addObject:first];

    Second *second = [self.storyboard instantiateViewControllerWithIdentifier:@"Second"];
    [scrollView addSubview:second.view];
    second.view.frame = CGRectMake(320.0, 0.0, 320.0, 460.0) ;
    [controllers addObject:second];
}