iPad App - Change languages programmatically

ios, ipad, iphone, localization, objective-c

Solution

FOUND THE SOLUTION!!!

The following test app had a function that read the desired string from the correct 'Localizable.strings' file (based on the language selected): https://github.com/object2dot0/Advance-Localization-in-ios-apps

I took this code, and the code required to set the app's primary language (found in the above answer posted by Brayden: How to force NSLocalizedString to use a specific language), and put them together.

Here's what my code looks like now (note - my UISegmentedControl calls a function in it's view's viewController [when the UISegmentedControl's 'Value Changed' method is triggered] that then calls the toggleLanguage function in the parent viewController):

    -(void)toggleLanguage:(NSString *)primaryLanguage secondaryLanguage:(NSString *)secondaryLanguage
    {
        //set app's primary language
        defaults = [NSUserDefaults standardUserDefaults];
        [defaults setObject:[NSArray arrayWithObjects:primaryLanguage,secondaryLanguage,nil] forKey:@"AppleLanguages"];
        [defaults synchronize];

        //update UILabel and UIImageViews
        [self setLanguageSpecificItems];
    }
    -(NSString *)languageSelectedStringForKey:(NSString *)key
    {
        //read primary language
        NSArray *appleLanguagesArray = [defaults objectForKey:@"AppleLanguages"];
        NSString *currentLanguage = [appleLanguagesArray objectAtIndex:0];

        //get the path to the desired lproj file
        NSString *path;
        if(currentLanguage==@"en")
        {
            path = [[NSBundle mainBundle] pathForResource:@"en" ofType:@"lproj"];
        }
        else
        if(currentLanguage==@"fr")
        {
            path = [[NSBundle mainBundle] pathForResource:@"fr" ofType:@"lproj"];
        }
        NSBundle* languageBundle = [NSBundle bundleWithPath:path];

        //find and return the desired string
        NSString* str=[languageBundle localizedStringForKey:key value:@"" table:nil];
        return str;
    }
    -(void)setLanguageSpecificItems
    {
        myUIImageView1.image = [UIImage imageNamed:[self languageSelectedStringForKey:@"myUIImageView1"]];
        myLabel1.text = [self languageSelectedStringForKey:@"myLabel1"];
    }

Thanks for the help everyone!!!

-Chris Allinson

Problem

I have an app that requires 2 languages, English and French. I have already set up the Localizable.strings files in their respective "en.lproj" and "fr.lproj" folders ... and when I change the iPad's language (in the native settings app), then launch my app, it does in fact load the correct text (i.e. either English copy or French copy). I need to have a UISegmentedControl toggle between the 2 languages without having to restart the app. How do I get the app to change the (current) language so that when I call a method that (re)sets all the UILabels' text and UIImageViews' images they read from the opposite .lproj folder's Localizable.strings file?!? I know how to use UISegmentedControl, and that is not my question. I'm looking more for a line of code that sets the application's bundle language or locale or something (as I'm quite new to internationalization.localization). Example of how I set the image for a UIImageView: ``` myUIImageView1.image = [UIImage imageNamed:NSLocalizedString(@"myUIImageView1", @"comment for the translator")]; ``` Example of how I set the text of a UILabel: ``` myLabel1.text = NSLocalizedString(@"myLabel1", @"comment for the translator"); ```

Original source

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