ios - UIScrollView 缩放但 subview 保持不变

Question

我目前正在开发一个 iPad 应用程序，我需要一个“幻灯片”

因此，我创建了第一个 UIScrollView，它将用作分页器，在 viewDidLoad 中，我使用“for”循环将内容放入 UIScrollView。

这是循环:

for (int i = 0; i < self.thumbs.count; i++) {
    UIScrollView *subScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(self.ThumbsSlider.frame.size.width * i, 0, self.ThumbsSlider.frame.size.width, self.ThumbsSlider.frame.size.height)];
    [subScroll setDelegate:self];
    [subScroll setScrollEnabled:YES];
    [subScroll setBouncesZoom:YES];
    [subScroll setClipsToBounds:YES];
    [subScroll setContentMode:UIViewContentModeCenter];

    subviewImage          = [[AsyncImageView alloc] initWithFrame:CGRectMake(0 , 0, subScroll.frame.size.width, subScroll.frame.size.height)];
    subviewImage.contentMode            = UIViewContentModeScaleAspectFit;
    subviewImage.userInteractionEnabled = YES;
    subviewImage.image    = [UIImage imageNamed:@"no-image.jpg"];
    subviewImage.imageURL = [NSURL URLWithString:[self.thumbs objectAtIndex:i]];

    [subScroll addSubview:subviewImage];

    subScroll.minimumZoomScale = 1.0;
    subScroll.maximumZoomScale = 3.0;

    [[subScroll delegate]viewForZoomingInScrollView:subScroll];

    [self.ThumbsSlider addSubview:subScroll];
}

当我在 iPad 上启动应用程序时，没有崩溃。 但是，当我尝试缩放时，我的 subScroll 的 contentSize 发生了变化，但 subviewImage 没有缩放!

有人能解释一下为什么吗？

提前致谢!

Answer 1

将此功能放入您的 Controller

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    for (UIView *imageView in scrollView.subviews)
    {
        if ([imageView isKindOfClass:[AsyncImageView Class]])
        {
            return imageView;
        }
    }

    return nil;
}

并从循环中删除以下行:

[[subScroll delegate]viewForZoomingInScrollView:subScroll];