Automatically add Accessibility Labels/Identifiers to all components that extend UIView

UIView+Accessibility.swift

import UIKit

private func isExcluded(_ kind: AnyClass) -> Bool {
    let name = String(describing: kind)
    return (name.count > 2 && name.prefix(2) == "UI") ||
        (name.count > 3 && name.prefix(3) == "_UI")
}

extension UIControl {
    override open var accessibilityIdentifier: String? {
        get {
            guard isExcluded(type(of: self)) else {
                return String(describing: type(of: self))
            }
            return super.accessibilityIdentifier
        }
        set {
            guard isExcluded(type(of: self)) else {
                return
            }
            super.accessibilityIdentifier = newValue
        }
    }
}

extension UIView {
    override open var isAccessibilityElement: Bool {
        get {
            guard isExcluded(type(of: self)) else {
                return true
            }
            return super.isAccessibilityElement
        }
        set {
            guard isExcluded(type(of: self)) else {
                return
            }
            super.isAccessibilityElement = newValue
        }
    }

    override open var accessibilityLabel: String? {
        get {
            guard isExcluded(type(of: self)) else {
                return String(describing: type(of: self))
            }
            return super.accessibilityLabel
        }
        set {
            guard isExcluded(type(of: self)) else {
                return
            }
            super.accessibilityLabel = newValue
        }
    }
}

private let debugAccessibilityEnabled = true

extension UIView {
    func debugAccessibility() {
        guard debugAccessibilityEnabled else { return }
        debugPrint("Accessibility")
        _debugAccessibility()
    }

    private func _debugAccessibility(nestingLevel: Int = 0) {
        let prefix = String(repeating: "-", count: nestingLevel + 2)
        if let accessibilityIdentifier = accessibilityIdentifier {
            debugPrint("\(prefix) id:", accessibilityIdentifier)
        }
        if let accessibilityLabel = accessibilityLabel {
            debugPrint("\(prefix) label:", accessibilityLabel)
        }
        subviews.forEach { $0._debugAccessibility(nestingLevel: nestingLevel + 2) }
    }
}

extension UIViewController {
    func debugAccessibility() {
        view.debugAccessibility()
    }
}

// How to use:

class ExampleButton: UIButton() { }

exampleButton.debugAccessibility()

Great job ! This is really useful to me.

I can re-use it and having it working for accessibilityLabel but unfortunately it does not work for accessibilityIdentifier (it stays nil) when the object come from Interface builder (storyboards or xib). Did you find any way around that ?