Implement UIAccessibilityContainer informal protocol and make error labels accessible #5
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The demo app target wasn't configured to embed MaterialTextField.framework into the app, so when running on device the framework couldn't be loaded and the app would crash.
For now the accessibility behaviour of the text field is identical to before. The text field is now a container, and its accessibilityElements include a single proxy element that just reports the accessibility properties of the text field itself.
From the `NSObject(UIAccessibilityContainer)` docs: > Containers can implement this property instead of the dynamic methods > to support the retrieval of the contained elements. The default value > of this property is nil. This doesn't seem to be entirely true. The behaviour observed was: - When navigating through MFTextFields, you could never sequentially navigate to the error label. - You could find the error by moving your finger around until it gained focus. - Once you'd located the error label this way, sequential navigation between accessibility elements was broken completely. Adding implementations of the dynamic methods resolved the issue.
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Found the following issues with voice over:
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Here's a quick summary of the changes
MFTextFieldis now an accessibility container.UIAccessibilityContainerinformal protocol that an accessibility container can't itself be accessible, so how is this achieved? I've created a proxy element that decoratesMFTextFieldand just delegates all accessibility properties to it.)UIAccessibilityLayoutChangedNotification, with the error label as the argument, so the error label gains focus whenever it appears.Let me know if you have any questions! Seems to work ok using the demo app on my device.