Perform LTR and RTL operation in Swift

Sometimes we need to make the application for both LTR as well as RTL. here is some concepts that will work for LTR, RTL but this will support for iOS 9.0 and greater.

Here are some steps to follow:

1: Select the project and set Localization language and select (use base internationalization).

2: Now you write code where the user will choose the language.

 @IBAction func `switch`(_ sender: Any) {
        
        
        if L102Language.currentAppleLanguage() == "en" {
            L102Language.setAppleLAnguageTo(lang: "ar")
            UIView.appearance().semanticContentAttribute = .forceRightToLeft
            
        } else {
            
            L102Language.setAppleLAnguageTo(lang: "en")
            UIView.appearance().semanticContentAttribute = .forceLeftToRight
            
        }
        
        
        
        let rootviewcontroller: UIWindow = ((UIApplication.shared.delegate?.window)!)!
        
        rootviewcontroller.rootViewController = self.storyboard?.instantiateViewController(withIdentifier: "rootnav")
        
        let mainwindow = (UIApplication.shared.delegate?.window!)!
        
        mainwindow.backgroundColor = UIColor(hue: 0.6477, saturation: 0.6314, brightness: 0.6077, alpha: 0.8)
        
        UIView.transition(with: mainwindow, duration: 0.55001, options: .transitionFlipFromLeft, animations: { () -> Void in
            
        }) { (finished) -> Void in
            
        }
        
    }
}

let APPLE_LANGUAGE_KEY = "AppleLanguages"

/// L102Language

class L102Language {
    
    /// get current Apple language
    
    class func currentAppleLanguage() -> String{
        
        let userdef = UserDefaults.standard
        
        let langArray = userdef.object(forKey: APPLE_LANGUAGE_KEY) as! NSArray
        
        let current = langArray.firstObject as! String
        
        return current
        
    }
    
    /// set @lang to be the first in Applelanguages list
    
    class func setAppleLAnguageTo(lang: String) {
        
        let userdef = UserDefaults.standard
        
        userdef.set([lang,currentAppleLanguage()], forKey: APPLE_LANGUAGE_KEY)
        
        userdef.synchronize()
        
    }
}

@IBAction func `switch`(_ sender: Any) {

if L102Language.currentAppleLanguage() == "en" {

L102Language.setAppleLAnguageTo(lang: "ar")

UIView.appearance().semanticContentAttribute = .forceRightToLeft

} else {

L102Language.setAppleLAnguageTo(lang: "en")

UIView.appearance().semanticContentAttribute = .forceLeftToRight

}

let rootviewcontroller: UIWindow = ((UIApplication.shared.delegate?.window)!)!

rootviewcontroller.rootViewController = self.storyboard?.instantiateViewController(withIdentifier: "rootnav")

let mainwindow = (UIApplication.shared.delegate?.window!)!

mainwindow.backgroundColor = UIColor(hue: 0.6477, saturation: 0.6314, brightness: 0.6077, alpha: 0.8)

UIView.transition(with: mainwindow, duration: 0.55001, options: .transitionFlipFromLeft, animations: { () -> Void in

}) { (finished) -> Void in

}

let APPLE_LANGUAGE_KEY = "AppleLanguages"

/// L102Language

class L102Language {

/// get current Apple language

class func currentAppleLanguage() -> String{

let userdef = UserDefaults.standard

let langArray = userdef.object(forKey: APPLE_LANGUAGE_KEY) as! NSArray

let current = langArray.firstObject as! String

return current

}

/// set @lang to be the first in Applelanguages list

class func setAppleLAnguageTo(lang: String) {

let userdef = UserDefaults.standard

userdef.set([lang,currentAppleLanguage()], forKey: APPLE_LANGUAGE_KEY)

userdef.synchronize()

}

3: Here “rootnav” is the starting view controller “storyboardId” so you can set your parent view controller storyBoardId by this way it will affect for all view controller and perform the desired operation.

kunal prasad 26 October 2021

. . .

2 comments

Ramzi Tawfeek Aug 25, 2017 at 5:18 pm

this is code is working well, but we have issue in performance, app is being slow, do you have idea, why the app is slow when controlling the RTL and LTR manually?

kunal prasad (Moderator) Jul 20, 2018 at 11:59 am
Hi,
Sorry for your late Reply , actually there is noting any issue regarding app performance it just change the view direction & nothing else so please check the other part of your code .

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Perform LTR and RTL operation in Swift

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