VoiceOver is finding a nearby accessible element to read?

问题

I'm adding accessibility to my iOS app. I'm seeing a specific situation that when I tap on a UIView that has isAccessibilityElement = false, and all of its ancestor views are also isAccessibilityElement = false, VoiceOver will speak the text from this view's sibling - a different child of this view's parent. And in Accessibility Inspector, when I hover over this view, the sibling lights up.

I don't understand how some view that's not in the hierarchy of the one I'm tapping on could be used for VoiceOver text. I don't see any behavior like this documented for iOS 11. How could this be happening?

Edit: I've created a simple project with a UITableView, containing UITableViewCell objects, each of which contains a UILabel. Tapping on a UITableViewCell (outside the UILabel) will read the UILabel within it. How do I disable that behavior, so that only tapping on the label itself, not on its containing UITableViewCell, will read the label?

回答1:

A table view cell (container) and its content (children) cannot be accessible all together (explanation here).

Follow the steps hereunder to answer your edit mention so that only tapping on the label itself, not on its containing UITableViewCell, will read the label.

Create your own UITableViewCell class including one label.

class TestTableViewCell: UITableViewCell {

    @IBOutlet weak var myLabel: UILabel!

    override var accessibilityTraits: UIAccessibilityTraits {
        get { return UIAccessibilityTraitNone }
        set {}
    }
}

Define your label as a UIAccessibilityElement in the cell implementation to be included in its accessibilityElements array.

func tableView(_ tableView: UITableView,
               cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let zeCell = tableView.dequeueReusableCell(withIdentifier: "myPersoCell",
                                                   for: indexPath) as! TestTableViewCell

        zeCell.accessibilityElements = nil

        var elements = [UIAccessibilityElement]()

        let contentA11yElt = UIAccessibilityElement(accessibilityContainer: zeCell)
        contentA11yElt.accessibilityTraits = UIAccessibilityTraitStaticText
        contentA11yElt.accessibilityFrameInContainerSpace = zeCell.contentLabel.frame //To be adapted
        contentA11yElt.accessibilityLabel = "label content"

        elements.append(contentA11yElt)
        zeCell.accessibilityElements = elements

        return zeCell
    }

Following these code snippets will allow to select a label located inside a table view cell and to read out its content as desired.

来源：https://stackoverflow.com/questions/50989579/voiceover-is-finding-a-nearby-accessible-element-to-read

标签

ios

accessibility

voiceover