Iphone NSUserDafults在iOS7中工作不正常

有时我在iOS7及以下版本中得到了错误的密钥，工作正常。这是Xcode6.0错误吗？ 如何解决这个问题

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提前感谢

很好，Objective-C和Xcode-6与UserDefaults配合使用效果很好，根据我在使用NSUserDefaults时的经验，您需要非常小心保存和检索数据的方式：

我这样保存数据：

+(NSString *)languageKey{

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


    NSString *lang = [languages objectAtIndex:0];    

    if([lang isEqualToString:@"en"])
      return @"en";
    else if([lang isEqualToString:@"ar"])
      return @"ar";

    return @"en";    

}

+(NSString *)localizedStringForKey:(NSString *)key{

    NSString *path;
    if([[self languageKey] isEqualToString:@"en"])
        path = [[NSBundle mainBundle] pathForResource:@"en" ofType:@"lproj"];
    else if([[self languageKey] isEqualToString:@"ar"])
        path = [[NSBundle mainBundle] pathForResource:@"ar" ofType:@"lproj"];

    NSBundle* languageBundle = [NSBundle bundleWithPath:path];
    NSString* str=[languageBundle localizedStringForKey:key value:@"" table:nil];

    return str;
}

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:@"data" forKey:@"key"];
[prefs synchronize];

我检索的数据如下：

+(NSString *)languageKey{

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


    NSString *lang = [languages objectAtIndex:0];    

    if([lang isEqualToString:@"en"])
      return @"en";
    else if([lang isEqualToString:@"ar"])
      return @"ar";

    return @"en";    

}

+(NSString *)localizedStringForKey:(NSString *)key{

    NSString *path;
    if([[self languageKey] isEqualToString:@"en"])
        path = [[NSBundle mainBundle] pathForResource:@"en" ofType:@"lproj"];
    else if([[self languageKey] isEqualToString:@"ar"])
        path = [[NSBundle mainBundle] pathForResource:@"ar" ofType:@"lproj"];

    NSBundle* languageBundle = [NSBundle bundleWithPath:path];
    NSString* str=[languageBundle localizedStringForKey:key value:@"" table:nil];

    return str;
}

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:@"data" forKey:@"key"];
[prefs synchronize];

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当您检索数据时，我还看到一个[Default synchronize]，我认为这是不必要的，因为您没有保存数据，祝您好运。

我们需要查看您将所有内容存储在用户默认值中的代码。老实说，用户默认值可能不是存储信息的正确位置，比如this@JoelBell：谢谢你的回复，我更新了代码