为什么UIScrollview在Interface Builder中没有可访问性区域？ [英] Why doesn't UIScrollview have an accessibility area in the Interface Builder?
问题描述
我注意到UIScrollView没有提到可访问性区域，我可以在其中设置辅助功能标签或辅助功能。这似乎也适用于活动指标。
I've noticed that a UIScrollView doesn't have mentioned accessibility area where I can set accessibility label or accessibility. This seems to apply for activity indicators too.
为什么UIVIews，UIButton等有这个区域而不是UIScrollView和UIActivityIndicatorView？
Why does UIVIews, UIButtons and more have this area and not UIScrollView and UIActivityIndicatorView?
推荐答案
好问题 - 滚动视图的原因是Apple不认为它是一个可访问的元素。
Good question - the reason for a scroll view is that Apple don't consider it to be an accessible element.
如果您查看 UIAccessibility 文档，您会发现Apple有以下内容可以说明可访问元素：
If you look at the UIAccessibility documentation, you'll find Apple have the following to say on what counts as an 'accessible element':
这个[可访问视图]的唯一例外是一个视图，它只是作为应该可访问的其他项的容器。这样的视图应该实现UIAccessibilityContainer协议并将此属性设置为NO。
The only exception to this [a view being accessible] is a view that merely serves as a container for other items that should be accessible. Such a view should implement the UIAccessibilityContainer protocol and set this property to NO.
A UIScrollView 只是子视图的容器，因此其 isAccessibilityElement 属性设置为no（因此您在界面构建器中看不到辅助功能选项的原因）。
A UIScrollView is simply a container for subviews, so its isAccessibilityElement property is set to no (hence why you don't see the accessibility options in interface builder).
所以基本上，当你使用滚动视图时，其中的项应该是可访问的，而不是滚动视图本身。
So basically, when you're using a scroll view the items inside it should be accessible, but not the scroll view itself.
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