Easy XCUITest + Voice over setup using protocol, extension and Rswift

AccessibilityConstants.swift

import Foundation
import Rswift // pod 'R.swift'

typealias Localizable = R.string.localizable

// NOTE: Contains accesibility identifiers (XCUITest) + accesibility labels (Voice over support)
struct Accessibility {
  
  // MARK: Chat navigation bar
    static let chatNavigationUserProfileImageId = "ChatNavigationBar.chatOpponentAvatar"
    static func chatNavigationUserProfileImageLabel(_ name: String) -> String {
        return Localizable.chatNavigationOtherUserImageAccesibility(name)
    }
    static func chatNavigationUserProfileImageHint(_ name: String) -> String {
        return Localizable.chatNavigationOtherUserImageAccesibilityHint(name)
    }
  
}

AccessibilitySetupable.swift

import UIKit

protocol AccessibilitySetupable: class {
    
    func setupAccessibility()
}

extension UIView {
    
    func setAccessibility(_ identifier: String?, _ label: String?, _ hint: String?) {
        
        // NOTE: Important to enable user intaraction for view 
        // to make it interactable while Voice Over is enabled
        self.isUserInteractionEnabled = label != nil
        
        self.isAccessibilityElement = label != nil
        self.accessibilityIdentifier = identifier
        self.accessibilityLabel = label
        self.accessibilityHint = hint
    }
    
}

ChatNavigationBar.swift

// MARK: - AccessibilitySetupable
extension ChatNavigationBar: AccessibilitySetupable {
    
    func setupAccessibility() {
        
        let label = Accessibility.chatNavigationUserProfileImageLabel(userNameLabel.text ?? "")
        let hint = Accessibility.chatNavigationUserProfileImageHint(userNameLabel.text ?? "")
        chatOpponentAvatar.setAccessibility(Accessibility.chatNavigationUserProfileImageId, label, hint)
    }
    
}

Localizable.strings

    // MARK: - Chat navigation bar
"chat-navigation.other-user-image.accesibility" = "%@ user image";
"chat-navigation.other-user-image.accesibility-hint" = "Double Tap to view %@ profile";