如果公司的iOS应用需要支持歪果仁，那么多语言是必不可少的，至少要支持一门英语吧，要不然还不如不做，关于iOS本地化网上也看了不少文章，总是感觉离工程实战少了点感觉，我们先简单看一下Demo效果:

Language.gif

App中多语言设置起始很简单,主要步骤如下:
1.项目设置需要支持的语言:

Snip20160601_1.png

2.UIStoryBoard，xib及strings多语言设置:
UIStoryBoard多语言设置:

Paste_Image.png

strings文件设置:

Snip20160601_5.png

3.iOS本地化默认支持的是Localizable.strings文件:
<pre><code>self.localizedLabel.text=NSLocalizedString(@"Hello", nil);</code></pre>
当然我们也可以自定义一个FlyElephant.strings的文件:
<pre><code>self.localizedLabel.text=NSLocalizedStringFromTable(@"Hello", @"FlyElephant", nil);</code></pre>

4.语言切换:

<pre><code>`
NSString *code;
if ([[[NSUserDefaults standardUserDefaults] valueForKey:@"AppleLanguages"][0] isEqual:@"en"]) {
code=@"zh-Hans";
}else{
code=@"en";
}
[[NSUserDefaults standardUserDefaults] setObject:@[code] forKey:@"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize];

AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
[appDelegate reloadRootContoller:code];`</code></pre>

5.AppDelegate设置:
<pre><code>`

pragma mark - RootViewController

-(void)loadRootViewController{
ViewController *rootController=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ViewController"];
self.window.rootViewController=rootController;
}

pragma mark - Public

-(void)reloadRootContoller:(NSString *)code{
[NSBundle setLanguage:code];
[self loadRootViewController];
}`</code></pre>

6.NSBundle扩展:
<pre><code>`
@interface NSBundle (Language)

• (void)setLanguage:(NSString *)language;

@end`</code></pre>

<pre><code>`

import "NSBundle+Language.h"

import <objc/runtime.h>

static const char kBundleKey = 0;

@interface BundleEx : NSBundle

@end

@implementation BundleEx

• (NSString *)localizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName
  {
  NSBundle *bundle = objc_getAssociatedObject(self, &kBundleKey);
  if (bundle) {
  return [bundle localizedStringForKey:key value:value table:tableName];
  }
  else {
  return [super localizedStringForKey:key value:value table:tableName];
  }
  }

@end

@implementation NSBundle (Language)

• (void)setLanguage:(NSString *)language
  {
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
  object_setClass([NSBundle mainBundle],[BundleEx class]);
  });
  id value = language ? [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:language ofType:@"lproj"]] : nil;
  objc_setAssociatedObject([NSBundle mainBundle], &kBundleKey, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
  }

@end`</code></pre>

基本的应用内语言切换功能可以实现了，如果对于App多语言有什么问题，欢迎评论区共同探讨~