如何从 NSDictionary 获取 NSArray 名称?

How to fetch a NSArray name from NSDictionary?

这是我设置或创建 NSDictionary 对象的方式:

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
[userDefault setObject:[NSArray arrayWithObjects:@"ar", nil] forKey:@"AppleLanguages"];
[userDefault synchronize];

而且,我在这里获取并存储到本地 NSDictionary:

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSDictionary *dictLanguage = [userDefault objectForKey:@"AppleLanguages"];
[userDefault synchronize];

这里我想用同样的方法检查是@"ar"还是@"en":

if ([[[dictLanguage objectForKey:@"AppleLanguages"] isEqualToString:@"ar"]]) {
    strCategoryUrl = [NSString stringWithFormat:@"%@%@", ROOT_URL, API_PRODUCT_MAIN_AR];
}
else if ([[dictLanguage objectForKey:@"AppleLanguages"] isEqualToString:@"en"]) {
    strCategoryUrl = [NSString stringWithFormat:@"%@%@", ROOT_URL, API_PRODUCT_MAIN_EN];
}

如果您存储了一个 NSArray ,那么您必须将其读取为 NSArray 而不是 NSDictionary 也可以使用此代码来检查当前语言

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSArray *arrLang = [userDefault objectForKey:@"AppleLanguages"];

if ([arrLang[0] isEqualToString:@"ar"]) {
    strCategoryUrl = [NSString stringWithFormat:@"%@%@", ROOT_URL,    API_PRODUCT_MAIN_AR];
}
else if ([arrLang[0] isEqualToString:@"en"]) {
    strCategoryUrl = [NSString stringWithFormat:@"%@%@", ROOT_URL, API_PRODUCT_MAIN_EN];
}

您的 userDefault 结构如下所示:

 {
        "AppleLanguages" : [
                            "ar"
                            ]
    }

所以,你的字典有 AppleLanguages as keyarray of values as 。当您访问此键时,您会得到一个数组而不是字典。

所以,而不是

NSDictionary *dictLanguage = [userDefault objectForKey:@"AppleLanguages"];

使用

NSArray *arrLanguage = [userDefault objectForKey:@"AppleLanguages"];

你的 If 条件应该是

if ([arrLanguage[0] isEqualToString:@"ar"]) {
    strCategoryUrl = [NSString stringWithFormat:@"%@%@", ROOT_URL, API_PRODUCT_MAIN_AR];
}
else if ([arrLanguage[0] isEqualToString:@"en"]) {
    strCategoryUrl = [NSString stringWithFormat:@"%@%@", ROOT_URL, API_PRODUCT_MAIN_EN];
}