如何在Xcode中实现iOS应用焦点方向从LTR改为RTL？

Hey there! Let's tackle this RTL focus direction issue for your iOS accessibility integration. I've got a couple of solid methods to get this sorted in Xcode, depending on your preference for interface tools or code.

If you prefer visual setup, this is the way to go:

• Open your target storyboard or XIB file, then select either a specific view controller, a top-level view, or even the entire view hierarchy you want to adjust.
• Head to the Attributes Inspector (the right-hand panel with the slider icon) and look for the Semantic dropdown.
• Change its value from Unspecified or Left to Right to Right to Left.
• For app-wide RTL default: Go to your project settings → Select your target → Navigate to the Info tab → Find Localization native development region and set it to an RTL-supported region (like Arabic ar or Hebrew he). This will make the app automatically adopt RTL layout and focus direction on launch.

If you need more dynamic control, use code to set RTL behavior:

Global App-Wide Setting #

Add this to your AppDelegate's application(_:didFinishLaunchingWithOptions:) method:

override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Force RTL for all views
    UIView.appearance().semanticContentAttribute = .forceRightToLeft
    return true
}

For SwiftUI apps, add the setting in your app's initializer:

@main
struct YouriOSApp: App {
    init() {
        UIView.appearance().semanticContentAttribute = .forceRightToLeft
    }
    
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Single View/ViewController Setting #

To apply RTL only to a specific screen or component:

override func viewDidLoad() {
    super.viewDidLoad()
    // Set RTL for the entire view controller's view
    self.view.semanticContentAttribute = .forceRightToLeft
    
    // Or target individual controls (e.g., a button)
    yourCustomButton.semanticContentAttribute = .forceRightToLeft
}

Since you're working on accessibility, here are key points to ensure VoiceOver and focus behave correctly:

• When using semanticContentAttribute = .forceRightToLeft, iOS automatically adjusts focus order for most standard controls. But for custom controls, double-check their accessibilityFrame and accessibilityTraits to ensure they align with RTL layout.
• If you need full control over focus sequence, implement the UIAccessibilityContainer protocol for your view. Rewrite the accessibilityElements array to list your UI components in RTL order (right-to-left) — this will dictate the exact path VoiceOver takes when navigating.
• Always test with VoiceOver enabled! This is the best way to verify that focus moves from right to left as intended for your users.

Quick Note #

If you only want to adjust focus direction without altering the entire layout, avoid using semanticContentAttribute (since it affects layout too). Instead, use the UIAccessibilityContainer approach to manually define the focus order.

内容的提问来源于stack exchange，提问作者Moran