iOS 怎么解析php后台直接返回的json vlue值

 

NSData *jsonData = [self.paramModel.travel_data.ts_content dataUsingEncoding:NSUTF8StringEncoding];
NSError *err;
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&err];
_air_flight_min = [NSString stringWithFormat:@"%@", dic[@"air_flight_min"]];

 使用上述方法即可把后台返回的json数据里的值解析出来