ios - 以编程方式将 UIImageView 添加到 UIScrollView

Question

我正在尝试以编程方式创建包含 UIImageView 的 UIScrollView。 UIImageView 的图像应该垂直滚动，我的问题是 UIScrollView 从未添加到我的主视图中。这是代码

@property (strong, nonatomic) UIImageView *advertiseView;
@property UIScrollView *sv;

    - (void)viewWillAppear:(BOOL)animated {
        [super viewWillAppear:animated];
        _sv = [[UIScrollView alloc] init];

        _advertiseView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,568)];
        UIImage *image = [UIImage imageNamed:@"abc.png"];

        _advertiseView.image = image;
        _advertiseView.frame = (CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=image.size};
        [_sv addSubview:_advertiseView];
        _sv.contentSize = CGSizeMake(320,1136); // size of abc.png
        [self.view addSubview:_sv];
    }

我错过了什么？？

Answer 1

您没有设置 ScrollView 的大小。试试这个:

_sv = [[UIScrollView alloc] initWithFrame:self.view.bounds];