iphone - 使用 NSJSONSerialization 解析 JSON

Question

对此进行了太多讨论，但我不知道如何解决我的问题。

这是我从 WorldWeatherOnline 获取的 JSON 数据。 JSON 有效。但我不知道如何解析它。这是我的代码，后面是 JSON。请帮忙!

NSError* errorInfo;
NSDictionary *parsedJSON = [NSJSONSerialization JSONObjectWithData:self.wwoWeatherData options:kNilOptions error:&errorInfo];

NSArray* temp = [parsedJSON objectForKey:@"temp_C"];
NSLog(@"%@", temp);

   {   "data":{      "current_condition":[         {            "cloudcover":"0",            "humidity":"82",            "observation_time":"11:07 PM",            "precipMM":"0.0",            "pressure":"1024",            "temp_C":"16",            "temp_F":"61",            "visibility":"10",            "weatherCode":"113",            "weatherDesc":[               {                  "value":"Clear"               }            ],            "weatherIconUrl":[               {                  "value":"http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0008_clear_sky_night.png"               }            ],            "winddir16Point":"NNE",            "winddirDegree":"30",            "windspeedKmph":"11",            "windspeedMiles":"7"         }      ],      "request":[         {            "query":"Lat 48.85 and Lon 2.35",            "type":"LatLon"         }      ],      "weather":[         {            "date":"2012-09-04",            "precipMM":"0.0",            "tempMaxC":"25",            "tempMaxF":"77",            "tempMinC":"14",            "tempMinF":"57",            "weatherCode":"113",            "weatherDesc":[               {                  "value":"Sunny"               }            ],            "weatherIconUrl":[               {                  "value":"http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0001_sunny.png"               }            ],            "winddir16Point":"N",            "winddirDegree":"5",            "winddirection":"N",            "windspeedKmph":"13",            "windspeedMiles":"8"         },         {            "date":"2012-09-05",            "precipMM":"0.0",            "tempMaxC":"22",            "tempMaxF":"72",            "tempMinC":"10",            "tempMinF":"50",            "weatherCode":"113",            "weatherDesc":[               {                  "value":"Sunny"               }            ],            "weatherIconUrl":[               {                  "value":"http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0001_sunny.png"               }            ],            "winddir16Point":"NNE",            "winddirDegree":"25",            "winddirection":"NNE",            "windspeedKmph":"20",            "windspeedMiles":"13"         },         {            "date":"2012-09-06",            "precipMM":"0.0",            "tempMaxC":"22",            "tempMaxF":"71",            "tempMinC":"11",            "tempMinF":"51",            "weatherCode":"113",            "weatherDesc":[               {                  "value":"Sunny"               }            ],            "weatherIconUrl":[               {                  "value":"http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0001_sunny.png"               }            ],            "winddir16Point":"NE",            "winddirDegree":"42",            "winddirection":"NE",            "windspeedKmph":"15",            "windspeedMiles":"10"         },         {            "date":"2012-09-07",            "precipMM":"0.0",            "tempMaxC":"24",            "tempMaxF":"75",            "tempMinC":"13",            "tempMinF":"55",            "weatherCode":"116",            "weatherDesc":[               {                  "value":"Partly Cloudy"               }            ],            "weatherIconUrl":[               {                  "value":"http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0002_sunny_intervals.png"               }            ],            "winddir16Point":"ENE",            "winddirDegree":"56",            "winddirection":"ENE",            "windspeedKmph":"13",            "windspeedMiles":"8"         },         {            "date":"2012-09-08",            "precipMM":"0.0",            "tempMaxC":"26",            "tempMaxF":"78",            "tempMinC":"16",            "tempMinF":"61",            "weatherCode":"113",            "weatherDesc":[               {                  "value":"Sunny"               }            ],            "weatherIconUrl":[               {                  "value":"http:\/\/www.worldweatheronline.com\/images\/wsymbols01_png_64\/wsymbol_0001_sunny.png"               }            ],            "winddir16Point":"ENE",            "winddirDegree":"76",            "winddirection":"ENE",            "windspeedKmph":"9",            "windspeedMiles":"6"         }      ]   }}

Answer 1

您解析的 json 包含一个名为 data 的字典。该字典中有一个 current_condition 数组。继续深入研究数据结构以找到您正在寻找的属性:

NSDictionary *data = [parsedJSON objectForKey:@"data"];
NSArray *currentConditions = [data objectForKey:@"current_condition"];
NSDictionary *condition = [currentConditions objectAtIndex:0];
NSString *tempC = [condition objectForKey:@"temp_C"];