如何从此 json 数据中获取键和值？

Posted 2023-03-16

【中文标题】如何从此 json 数据中获取键和值？

【英文标题】：How to fetch keys and values from this json data?

【发布时间】：2015-10-24 04:18:36

【问题描述】：

  "languages": "de-AT,hr,hu,sl",
  "distance": "0",
  "countryCode": "AT",
  "countryName": "Austria"


NSDictionary *lan = [NSDictionary dictionaryWithObjectAndKeys:languages,@"lan",nil];
[lan setObject:@"de-AT"ofKey:@"languages"];
[lan setObject:@"hr"ofKey:@"languages"];
[lan setObject:@"hu"ofKey:@"languages"];
[lan setObject:@"sl"ofKey:@"languages"];

NSDictionary *dist = [NSDictionary dictionaryWithObjectAndKeys:@"0",@"distance",nil];

NSDictionary *code= [NSDictionary dictionaryWithObjectAndKeys:@"AT",@"countryCode",nil];

NSDictionary *code= [NSDictionary dictionaryWithObjectAndKeys:@"Austria",@"countryName",nil];

我在上面做这样的事情，我可能是错的还是对的，请发表您的建议，谢谢

【参考方案1】：

你做错了。 要将 JSON 转换为 NSDictionary，您应该使用 NSJSONSerialization

    /// data = 
    //    "languages": "de-AT,hr,hu,sl",
    //    "distance": "0",
    //    "countryCode": "AT",
    //    "countryName": "Austria"
    //  
    NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
    NSString * countryName = dictionary[@"countryName"]; // get countryNAme

用于创建像data这样的NSDictionary

NSDictionary *dist = [NSDictionary dictionaryWithObjectAndKeys:
                      @"de-AT,hr,hu,sl",@"languages",
                      @"0",@"countryCode"
                      @"AT",@"countryCode"
                      @"Austria",@"countryName"
                       nil];