应用内动态更换语言

[code=language-objectivec]1.定义文件路径宏：（所有文本都用宏）
#define CustomLocalizedString(key, comment) \
[[NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"userLanguage"]] ofType:@"lproj"]] localizedStringForKey:(key) value:@"" table:@"AppLanguage"]

2.根据alert选项取不同文件：
if (IOS8_OR_LATER)
{

UIAlertController *languageAlert = [UIAlertController alertControllerWithTitle:@"" message:CustomLocalizedString(@"language_mode", nil) preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:CustomLocalizedString(@"language_cancelBtn", nil) style:UIAlertActionStyleCancel handler:nil];
UIAlertAction *tcAction = [UIAlertAction actionWithTitle:CustomLocalizedString(@"login_language_item_TC", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[[NSUserDefaults standardUserDefaults] setObject:@"zh-Hant" forKey:@"userLanguage"];
[self refreshHomeView];
}];
UIAlertAction *scAction = [UIAlertAction actionWithTitle:CustomLocalizedString(@"login_language_item_SC", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[[NSUserDefaults standardUserDefaults] setObject:@"zh-Hans" forKey:@"userLanguage"];
[self refreshHomeView];
}];
UIAlertAction *enAction = [UIAlertAction actionWithTitle:CustomLocalizedString(@"login_language_item_EN", nil) style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[[NSUserDefaults standardUserDefaults] setObject:@"en" forKey:@"userLanguage"];
[self refreshHomeView];
}];
[languageAlert addAction:cancelAction];
[languageAlert addAction:tcAction];
[languageAlert addAction:scAction];
[languageAlert addAction:enAction];
[self presentViewController:languageAlert animated:YES completion:nil];
}
else
{
UIActionSheet *sheet = [[UIActionSheet alloc]initWithTitle:CustomLocalizedString(@"language_mode", nil)
delegate:self
cancelButtonTitle:CustomLocalizedString(@"language_cancelBtn", nil)
destructiveButtonTitle:nil
otherButtonTitles:CustomLocalizedString(@"login_language_item_TC", nil),
CustomLocalizedString(@"login_language_item_SC", nil),
CustomLocalizedString(@"login_language_item_EN", nil),
nil];
[sheet showInView:self.view];

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
switch (buttonIndex) {
case 0:
[[NSUserDefaults standardUserDefaults] setObject:@"zh-Hant" forKey:@"userLanguage"];
[self refreshHomeView];
break;

case 1:
[[NSUserDefaults standardUserDefaults] setObject:@"zh-Hans" forKey:@"userLanguage"];
[self refreshHomeView];
break;
case 2:
[[NSUserDefaults standardUserDefaults] setObject:@"en" forKey:@"userLanguage"];
[self refreshHomeView];
break;
default:
break;
}
}

图片其他要区分语言的文件，相同原理。