Implementing iOS accessibility features
On iOS certain accessibility features requires us to define functions to the Native-objects.
Functions:
accessibilityActivate()
Tells the element to activate itself and report the success or failure of the operation.
accessibilityIncrement()
Tells the accessibility element to increment the value of its content.
User action: A one-finger swipe up that increments a value in an element.
accessibilityDecrement()
Tells the accessibility element to decrement the value of its content.
User action: A one-finger swipe down that decrements a value in an element.
accessibilityScroll(UIAccessibilityScrollDirection)
Scrolls screen content in an application-specific way and returns the success or failure of the action.
User action: A three-finger swipe that scrolls content vertically or horizontally.
accessibilityPerformEscape()
Dismisses a modal view and returns the success or failure of the action.
User action: A two-finger Z-shaped gesture that dismisses a modal dialog, or goes back one level in a navigation hierarchy. Returns true, if we're handling the escape. Dev note: Unlike accessibilityPerformMagicTap() this cannot be added to the AppDelegate in NativeScript.
accessibilityPerformMagicTap()
Performs a salient action.
User action: A two-finger double-tap that performs the most-intended action. This could be play/pause in an audio-player or pick/hang up in a phone-app. Dev note: Can be added to the AppDelegate in NativeScript.
Links
https://developer.apple.com/documentation/uikit/accessibility/uiaccessibilityaction https://developer.apple.com/library/content/featuredarticles/ViewControllerPGforiPhoneOS/SupportingAccessibility.html