iOS manual language selection

The original approach is following the  stack overflow article manual language selection in an iOS-App (iPhone and iPad) by Hubert Schölnast


Header file LocalizeHelper.h

// macro
// Use "LocalizedString(key)" the same way you would use "NSLocalizedString(key,comment)"
#define LocalizedString(key) [[LocalizeHelper sharedLocalSystem] localizedStringForKey:(key)]

// "language" can be (for american english): "en", "en-US", "english". Analogous for other languages.
#define LocalizationSetLanguage(language) [[LocalizeHelper sharedLocalSystem] setLanguage:(language)]


#import 

@interface LocalizeHelper : NSObject

// a singleton:
+ (LocalizeHelper*) sharedLocalSystem;

// this gets the string localized:
- (NSString*) localizedStringForKey:(NSString*) key;

//set a new language:
- (void) setLanguage:(NSString*) lang;

@end

Implementation file : LocalizeHelper.m

#import "LocalizeHelper.h"


// Singleton
static LocalizeHelper* SingleLocalSystem = nil;

// my Bundle (not the main bundle!)
static NSBundle* myBundle = nil;

@implementation LocalizeHelper


//-------------------------------------------------------------
// allways return the same singleton
//-------------------------------------------------------------
+ (LocalizeHelper*) sharedLocalSystem {
    // lazy instantiation
    if (SingleLocalSystem == nil) {
        SingleLocalSystem = [[LocalizeHelper alloc] init];
    }
    return SingleLocalSystem;
}


//-------------------------------------------------------------
// initiating
//-------------------------------------------------------------
- (id) init {
    self = [super init];
    if (self) {
        // use systems main bundle as default bundle
        myBundle = [NSBundle mainBundle];
    }
    return self;
}


//-------------------------------------------------------------
// translate a string
//-------------------------------------------------------------
// you can use this macro:
// LocalizedString(@"Text");
- (NSString*) localizedStringForKey:(NSString*) key {
    // this is almost exactly what is done when calling the macro NSLocalizedString(@"Text",@"comment")
    // the difference is: here we do not use the systems main bundle, but a bundle
    // we selected manually before (see "setLanguage")
    return [myBundle localizedStringForKey:key value:@"" table:nil];
}


//-------------------------------------------------------------
// set a new language
//-------------------------------------------------------------
// you can use this macro:
// LocalizationSetLanguage(@"German") or LocalizationSetLanguage(@"de");
- (void) setLanguage:(NSString*) lang {
    
    // path to this languages bundle
    NSString *path = [[NSBundle mainBundle] pathForResource:lang ofType:@"lproj" ];
    if (path == nil) {
        // there is no bundle for that language
        // use main bundle instead
        myBundle = [NSBundle mainBundle];
    } else {
        
        // use this bundle as my bundle from now on:
        myBundle = [NSBundle bundleWithPath:path];
        
        // to be absolutely shure (this is probably unnecessary):
        if (myBundle == nil) {
            myBundle = [NSBundle mainBundle];
        }
    }
}

@end

How to use. first, prepare the two localizable.string file

    NSString *selectedLanguage = @"zh-Hant";
    LocalizationSetLanguage(selectedLanguage);
    
    NSLog(@"%@",LocalizedString(@"TITLE"));
    
    selectedLanguage = @"en";
    LocalizationSetLanguage(selectedLanguage);
    
    NSLog(@"%@",LocalizedString(@"TITLE"));

iOS how to manual language to your app

There are approach to localize an iPhone app already. In this article we are going to learn how to get localize string file , and then transfer to NSDictionary class. By NSDictionary object, we can get localize string by inputing dedicated key.

NSString *path = [[NSBundle mainBundle] pathForResource:@"Localizable" ofType:@"strings" inDirectory:nil forLocalization:@"zh-Hant"];

    

NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];

NSString *twTranslation = [dict objectForKey:@"TITLE"];

    

NSLog(@"%@", twTranslation);

iOS get current date and time

It is simple to get current date and time, Apple Developer have a Class named NSDate, bravo!! Besides, function dateFormat can format the date and time, awesome. Finally, using the setTimeZone function to set timezone.

NSDate *now = [NSDate date];

NSDateFormatter *currentTime = [[NSDateFormatter alloc] init];

currentTime.dateFormat = @"yyyy:mm:dd:hh:mm:ss";

[currentTime setTimeZone:[NSTimeZone systemTimeZone]];

NSLog(@"time:%@",[currentTime stringFromDate:now]);

iOS get current language

how to get current lanugage in your iOS,  following code is the simple solution.

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSArray *languages = [defaults objectForKey:@"AppleLanguages"];

NSString *currentLanguage = [languages objectAtIndex:0];

    

NSLog(@"Current Locale: %@", [[NSLocale currentLocale] localeIdentifier]);

NSLog(@"Current language: %@", currentLanguage);

detail please see apple developer NSUserDefaults

Android Calendar to get current date and time

In applications, we may need the current system date and time. Android developer have a Class named Calendar, let's go see it.

Calendar now = Calendar.getInstance();
  
int year = now.get(Calendar.YEAR)
int month= now.get(Calendar.MONTH);
int day  = now.get(Calendar.DAY_OF_MONTH);

int hour = now.get(Calendar.HOUR);
int min  = now.get(Calendar.MINUTE);
.....

detail please see android developer Calendar

Android action bar to set title of window

The action bar is a window feature to identifies the application. We can easily use the setTitle API to set title.

ActionBar ab = getActionBar();
ab.setTitle(R.string.title);

detail please see android developer Action Bar

iOS set Keyboard Type

It is simple to set keyboard type for your TextField
First of all, let's get enum

typedef enum {
   UIKeyboardTypeDefault,
   UIKeyboardTypeASCIICapable,
   UIKeyboardTypeNumbersAndPunctuation,
   UIKeyboardTypeURL,
   UIKeyboardTypeNumberPad,
   UIKeyboardTypePhonePad,
   UIKeyboardTypeNamePhonePad,
   UIKeyboardTypeEmailAddress,
   UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable
} UIKeyboardType;

// set keyboard type to UITextField, Done.
[textField setKeyboardType:UIKeyboardTypeDecimalPad];

here is the detail from Share Our Ideas.