如何在Objective-C

我有這個JSON字符串如何在Objective-C

{ 
    "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/", 
    "city": [ 
     { 
      "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ABJ/", 
      "agencyCollection": { 
       "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ABJ/agencyCollection/" 
      }, 
      "codecit": "ABJ", 
      "country": { 
       "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ABJ/country/" 
      }, 
      "namecit": "ABIDJAN" 
     }, 
     { 
      "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ALG/", 
      "agencyCollection": { 
       "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ALG/agencyCollection/", 
       "agency": [ 
        { 
         "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ALG/agencyCollection/3/" 
        }, 
        { 
         "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ALG/agencyCollection/4/" 
        } 
       ] 
      }, 
      "codecit": "ALG", 
      "country": { 
       "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/ALG/country/" 
      }, 
      "namecit": "ALGER" 
     }, 
     { 
      "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/AMS/", 
      "agencyCollection": { 
       "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/AMS/agencyCollection/", 
       "agency": [ 
        { 
         "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/AMS/agencyCollection/5/" 
        }, 
        { 
         "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/AMS/agencyCollection/6/" 
        } 
       ] 
      }, 
      "codecit": "AMS", 
      "country": { 
       "@uri": "http://localhost:8080/TunisairRESTful/resources/cities/AMS/country/" 
      }, 
      "namecit": "AMSTERDAM" 
     } 
    ] 
}

我想分析它，我寫了這個代碼解析JSON

NSString *myJSON = [[NSString alloc] initWithContentsOfFile:responseString encoding:NSUTF8StringEncoding error:NULL]; 
NSDictionary *json = [myJSON JSONValue]; 
//NSLog(responseString); 
NSArray *citysList = [json objectForKey:@"city"]; 
NSLog(@"ok"); 
NSLog(@" number of element : %@", [citysList count]);

但我有0號元素，請幫助

來源

2011-05-23 user567

邁克爾是對的。這裏有一個更詳細的答案：

initWithContentsOfFile需要一個包含文件路徑的字符串（例如「/users/mehdi/documents/myFile.txt」）。您似乎正在傳遞實際的JSON字符串，這不是文件路徑。因此，initWithContentsOfFile可能會返回nil。

選中此問：

if (myJSON == nil) NSLog(@"myJSON variable == nil!");

如果是零，那麼你的代碼也設置json和citysList爲零。

試試這個：

NSDictionary *json = [responseString JSONValue]; 
NSArray *citysList = [json objectForKey:@"city"]; 
NSLog(@" number of element : %d", [citysList count]);

來源

2011-05-24 00:34:29 CharlieMezak

你正在做一個initWithContentsOfFile，但傳遞一個字符串。你有沒有試過簡單的[responseString JSONValue]？您的代碼表明，responseString對您要打開的文件具有PATH，而不是您的完整響應字符串本身。

來源

2011-05-23 23:13:19

啊是的，這是真的，謝謝 – user567 2011-05-24 01:55:33

如何在Objective-C

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