iOS 旁白阅读accessibilityIdentifier 而不是accessibilityLabel

Question

VoiceOver 应该阅读 accessibilityLabel屏幕上任何辅助功能元素的属性。我有一个 UIImageView叫 mediaImageView ，下面的代码在此 View 上设置可访问性，并在 awakeFromNib 中调用在 UITableViewCell子类。

而不是阅读 image , VoiceOver 朗读 articleMediaCell_image这是 accessibilityIdentifier .谁能解释为什么会发生这种情况？

(在 iOS 13.3 设备上测试，无论是否设置自定义操作都会出现问题)

    mediaImageView.isAccessibilityElement = true
    mediaImageView.accessibilityIdentifier = "articleMediaCell_image"
    mediaImageView.accessibilityLabel = "image"

    mediaImageView.accessibilityCustomActions = [
        UIAccessibilityCustomAction(
            name: "expand to fullscreen",
            target: self,
            selector: #selector(imageTapped)
        )
    ]

Answer 1

发生这种情况是因为您已将控件类型 (UIImage) 的特征(图像)设置为 accessibilityLabel 的值。这里:

mediaImageView.accessibilityLabel = "image"
/*
Won't work, because iOS already knows that this is an image from the element's traits.
Due to this, the redundant value is ignored and the voiceover falls back to reading the `accessibilityIdentifier`.
*/

使用任何值 - “媒体”例如 - 这不是对象的特征，因为画外音将读取可访问性标签值，然后是控件类型的特征，如下所示: “媒体形象” .

mediaImageView.accessibilityLabel = "media" /* This should work */

摘自 accessibilityLabel Apple Documentation :

Note that the label never includes the control type (such as button)because the traits of the accessibility element contain thatinformation.