Ios 以编程方式将UIImageView添加到UIScrollView

我试图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。 这是密码

@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];
    }

---

我遗漏了什么？？？

您没有设置ScrollView大小。试试这个：

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

int-width=0；
整数高度=0；
对于（int i=0；我是否检查了图像是否真的为非零？此外，我不认为您应该使用
viewwillbeen
更好地使用
viewDidLoad
，因为我认为您只想执行一次
int width = 0;
int height = 0;
for (int i=0; i<[menupicarray count]; i++)
{
    NSString *menupicname=[NSString stringWithFormat:@"%@",[menupicarray objectAtIndex:i]];
    UIImageView *imageView = [[UIImageView alloc] init ];
    [imageView setImageWithURL:[NSURL URLWithString:menupicname]
              placeholderImage:[UIImage imageNamed:@"NOmage.png"]];
    imageView.contentMode = UIViewContentModeScaleAspectFit;
    imageView.clipsToBounds = YES;
    imageView.frame = CGRectMake( MenuView.frame.size.width*i,0, MenuView.frame.size.width, MenuView.frame.size.height-5);
    [MenuView addSubview:imageView];
    width = imageView.frame.size.width;
    height = imageView.frame.size.height;
    MenuView.contentSize = CGSizeMake(width*i+imageView.bounds.size.width, height);
}