Availability 有効性
Technology
childrenA View that represents the replacement child views the framework uses to generate accessibility elements.
Use this modifier to replace an existing element’s children with one or more new synthetic accessibility elements you provide. This allows for synthetic, non-visual accessibility elements to be set as children of a visual accessibility element.
SwiftUI creates an accessibility container implicitly when needed. If an accessibility element already exists, the framework converts it into an accessibility container.
In the example below, a Canvas displays a graph of vertical bars that don’t have any inherent accessibility elements. You make the view accessible by adding the accessibility modifier with views whose accessibility elements represent the values of each bar drawn in the canvas:
var body: some View {
Canvas { context, size in
// Draw Graph
for data in dataSet {
let path = Path(
roundedRect: CGRect(
x: (size.width / CGFloat(dataSet.count))
* CGFloat(data.week),
y: 0,
width: size.width / CGFloat(dataSet.count),
height: CGFloat(data.lines),
cornerRadius: 5)
context.fill(path, with: .color(.blue))
}
// Draw Axis and Labels
...
}
.accessibilityLabel("Lines of Code per Week")
.accessibilityChildren {
HStack {
ForEach(dataSet) { data in
RoundedRectangle(cornerRadius: 5)
.accessibilityLabel("Week \(data.week)")
.accessibilityValue("\(data.lines) lines")
}
}
}
}SwiftUI hides any views that you provide with the children parameter, then the framework uses the views to generate the accessibility elements.
func accessibilityElement (children: AccessibilityChildBehavior ) -> some ViewAccessibilityChildBehavior of the existing accessibility element.func accessibilityHidden (Bool) -> ModifiedContent <Self, AccessibilityAttachmentModifier >