addSubview 在 iOS 3.1.3 上不显示视图
我有一个滚动视图，其中有一个 UIView ，其中包含内容。我添加一个 UIImageView 作为 UIScrollView 的子部分（因此它应该位于内容容器的顶部），这适用于 iPhone 3.2+，但在运行的 iPhone 上3.1.3 图像没有显示在容器上方。我的代码是这样的：
// add the content container
UIView *contentContainer = [[UIView alloc] init];
[scrollView addSubview:contentContainer];
// add content, etc
// this works in 3.2+
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[scrollView addSubview:imageView];
// tried adding this for 3.1, but still didn't work
[scrollView bringSubviewToFront:imageView];
[imageView setFrame:CGRectMake(point.x, point.y, image.size.width, image.size.height)];
我还缺少其他东西吗？谢谢！
I have a scroll view which has one UIView inside which contains the content. I am adding a UIImageView as a sub of the UIScrollView (so it should be on top of the content container) and this works on iPhone 3.2+, but on an iPhone running 3.1.3 the image does not show up above the container. My code is something like this:
// add the content container
UIView *contentContainer = [[UIView alloc] init];
[scrollView addSubview:contentContainer];
// add content, etc
// this works in 3.2+
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[scrollView addSubview:imageView];
// tried adding this for 3.1, but still didn't work
[scrollView bringSubviewToFront:imageView];
[imageView setFrame:CGRectMake(point.x, point.y, image.size.width, image.size.height)];
Is there something else that I'm missing? Thanks!
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发现问题：当我指定图像名称时，我没有指定图像扩展名：
如果我将其更改为以下内容，它会起作用：
iOS是否知道在存在扩展名时仍然查找“@2x”版本（如果可用）偶然？
Found the issue: when I specified the image name, I was not specifying the image extension:
If I change this to the following, it works:
Does iOS know to still look for the "@2x" version if available when the extension is present by chance?
您是否实际上还设置了
UIScrollView的contentSize属性？Are you also actually setting the
contentSizeproperty of theUIScrollView?