当我在设备语言独立于应用程序使用的语言时更改应用程序使用的语言，直到我关闭应用程序并重新启动它，更改才会生效。如何使应用程序不需要重新启动就能加载所有的nib文件和.strings文件，以便根据所选语言进行更新？
我使用以下代码在运行时更改语言：
NSArray* languages = [NSArray arrayWithObjects:@"ar", @"en", nil];
[[NSUserDefaults standardUserDefaults] setObject:languages forKey:@"AppleLanguages"];
var bundleKey: UInt8 = 0
class AnyLanguageBundle: Bundle {
override func localizedString(forKey key: String,
value: String?,
table tableName: String?) -> String {
guard let path = objc_getAssociatedObject(self, &bundleKey) as? String,
let bundle = Bundle(path: path) else {
return super.localizedString(forKey: key, value: value, table: tableName)
}
return bundle.localizedString(forKey: key, value: value, table: tableName)
}
}
extension Bundle {
class func setLanguage(_ language: String) {
defer {
object_setClass(Bundle.main, AnyLanguageBundle.self)
}
objc_setAssociatedObject(Bundle.main, &bundleKey, Bundle.main.path(forResource: language, ofType: "lproj"), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
func languageButtonAction() {
// This is done so that network calls now have the Accept-Language as "hi" (Using Alamofire) Check if you can remove these
UserDefaults.standard.set(["hi"], forKey: "AppleLanguages")
UserDefaults.standard.synchronize()
// Update the language by swapping bundle
Bundle.setLanguage("hi")
// Done to reinstantiate the storyboards instantly
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
UIApplication.shared.keyWindow?.rootViewController = storyboard.instantiateInitialViewController()
}
#import <Foundation/Foundation.h>
#define DEFAULT_DICTIONARY_FOR_STRINGS @""
#define ACCESSING_ALTERNATE_DICTIONARY_SETS_DEFAULT 1
#define LANGUAGE_ENGLISH_INT 0
#define LANGUAGE_SPANISH_INT 1
#define LANGUAGE_ENGLISH_SHORT_ID @"en"
#define LANGUAGE_SPANISH_SHORT_ID @"es"
#define LANGUAGE_CHANGED_NOTIFICATION @"LANGUAGE_CHANGED"
@interface MyLanguage : NSObject
{
NSString *currentLanguage;
NSDictionary *currentDictionary;
NSBundle *currentLanguageBundle;
}
+(void) setLanguage:(NSString *)languageName;
+(NSString *)stringFor:(NSString *)srcString forLanguage:(NSString *)languageName;
+(NSString *)stringFor:(NSString *)srcString;
+ (MyLanguage *)singleton;
@property (nonatomic, retain) NSBundle *currentLanguageBundle;
@property (nonatomic, retain) NSString *currentLanguage;
@property (nonatomic, retain) NSDictionary *currentDictionary;
@end
MyLanguage.m： // // MyLanguage.m
#import "MyLanguage.h"
#import "Valet.h"
#define GUI_STRING_FILE_POSTFIX @"GUIStrings.plist"
@implementation MyLanguage
@synthesize currentLanguage;
@synthesize currentDictionary;
@synthesize currentLanguageBundle;
+(NSDictionary *)getDictionaryNamed:(NSString *)languageName
{
NSDictionary *results = nil;
// for now, we store dictionaries in a PLIST with the same name.
NSString *dictionaryPlistFile = [languageName stringByAppendingString:GUI_STRING_FILE_POSTFIX];
NSString *plistBundlePath = [Valet getBundlePathForFileName:dictionaryPlistFile];
if ( [[NSFileManager defaultManager] fileExistsAtPath:plistBundlePath] )
{
// read it into a dictionary
NSDictionary *newDict = [NSDictionary dictionaryWithContentsOfFile:plistBundlePath];
results = [newDict valueForKey:@"languageDictionary"];
}// end if
return results;
}
+(NSString *)stringFor:(NSString *)srcString forDictionary:(NSString *)languageName;
{
MyLanguage *gsObject = [MyLanguage singleton];
// if default dictionary matches the requested one, use it.
if ([gsObject.currentLanguage isEqualToString:languageName])
{
// use default
return [MyLanguage stringFor:srcString];
}// end if
else
{
// get the desired dictionary
NSDictionary *newDict = [MyLanguage getDictionaryNamed:languageName];
// default is not desired!
if (ACCESSING_ALTERNATE_DICTIONARY_SETS_DEFAULT)
{
gsObject.currentDictionary = newDict;
gsObject.currentLanguage = languageName;
return [MyLanguage stringFor:srcString];
}// end if
else
{
// use current dictionary for translation.
NSString *results = [gsObject.currentDictionary valueForKey:srcString];
if (results == nil)
{
return srcString;
}// end if
return results;
}
}
}
+(void) setLanguage:(NSString *)languageName;
{
MyLanguage *gsObject = [MyLanguage singleton];
// for now, we store dictionaries in a PLIST with the same name.
// get the desired dictionary
NSDictionary *newDict = [MyLanguage getDictionaryNamed:languageName];
gsObject.currentDictionary = newDict;
gsObject.currentLanguage = languageName;
// now set up the bundle for nibs
NSString *shortLanguageIdentifier = @"en";
if ([languageName contains:@"spanish"] || [languageName contains:@"espanol"] || [languageName isEqualToString:LANGUAGE_SPANISH_SHORT_ID])
{
shortLanguageIdentifier = LANGUAGE_SPANISH_SHORT_ID;
}// end if
else
shortLanguageIdentifier = LANGUAGE_ENGLISH_SHORT_ID;
// NSArray *languages = [NSArray arrayWithObject:shortLanguageIdentifier];
// [[NSUserDefaults standardUserDefaults] setObject:languages forKey:@"AppleLanguages"];
//
NSString *path= [[NSBundle mainBundle] pathForResource:shortLanguageIdentifier ofType:@"lproj"];
NSBundle *languageBundle = [NSBundle bundleWithPath:path];
gsObject.currentLanguageBundle = languageBundle;
[[NSNotificationCenter defaultCenter] postNotificationName:LANGUAGE_CHANGED_NOTIFICATION object:nil];
}
+(NSString *)stringFor:(NSString *)srcString;
{
MyLanguage *gsObject = [MyLanguage singleton];
// default is to do nothing.
if (gsObject.currentDictionary == nil || gsObject.currentLanguage == nil || [gsObject.currentLanguage isEqualToString:DEFAULT_DICTIONARY_FOR_STRINGS] )
{
return srcString;
}// end if
// use current dictionary for translation.
NSString *results = [gsObject.currentDictionary valueForKey:srcString];
if (results == nil)
{
return srcString;
}// end if
return results;
}
#pragma mark -
#pragma mark Singleton methods
static MyLanguage *mySharedSingleton = nil;
-(void) lateInit;
{
}
// PUT THIS METHOD DECLARATION INTO THE HEADER
+ (MyLanguage *)singleton;
{
if (mySharedSingleton == nil) {
mySharedSingleton = [[super allocWithZone:NULL] init];
[mySharedSingleton lateInit];
}
return mySharedSingleton;
}
+ (id)allocWithZone:(NSZone *)zone
{ return [[self singleton] retain]; }
- (id)copyWithZone:(NSZone *)zone
{ return self; }
- (id)retain
{ return self; }
- (NSUInteger)retainCount //denotes an object that cannot be released
{ return NSUIntegerMax; }
- (oneway void)release //do nothing
{ }
- (id)autorelease
{ return self; }
@end
NSString *path = [[NSBundle mainBundle] pathForResource:currentLanguage ofType:@"lproj"];
if (path) {
NSBundle *localeBundle = [NSBundle bundleWithPath:path];
}
使用bundle获取本地化字符串：
NSLocalizedStringFromTableInBundle(stringThatNeedsToBeLocalized, nil, localeBundle, nil);
[NSDateFormatter dateFormatFromTemplate:@"HH:mm:ss"" options:0 locale:locale];
someLabel.text = NSLocalizedStringFromTableInBundle(@"Your String to be localized, %@",nil,self.localeBundle,@"some context for translators");
要更改语言，请运行此代码
NSString * language = @"zh-Hans"; //or whatever language you want
NSString *path = [[NSBundle mainBundle] pathForResource:language ofType:@"lproj"];
if (path) {
self.localeBundle = [NSBundle bundleWithPath:path];
}
else {
self.localeBundle = [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:@"en" ofType:@"lproj"] ];
}
在这之后，您可能希望调用任何更新代码以将字符串更新为新的语言，例如再次运行此操作。
someLabel.text = NSLocalizedStringFromTableInBundle(@"Your String to be localized, %@",nil,self.localeBundle,@"some context for translators");
就这样了，不需要重新启动应用程序。与系统设置兼容（如果您通过iOS设置设置语言，也将起作用）。不需要外部库。无需越狱。它还可以与genstrings一起使用。
当然，您仍然应该像往常一样使您的应用程序设置持久化：
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:@"zh-Hans", nil] forKey:@"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSString * language = [[NSLocale preferredLanguages] objectAtIndex:0];
NSString *path = [[NSBundle mainBundle] pathForResource:language ofType:@"lproj"];
if (path) {
self.localeBundle = [NSBundle bundleWithPath:path];
}
else {
self.localeBundle = [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:@"en" ofType:@"lproj"] ];
}
您应该创建自己的宏，类似于NSLocalizedString，但基于您设置的NSUserDefaults值选择字符串的包（即不用担心苹果语言默认值是什么）
当您更改语言时，应发送通知，视图控制器、视图等应侦听并刷新自己