JSON解析为一个对象

Question

我试图解析此JSON：

{ 
    "GetMachineGroupsResult": { 
     "MachineGroups": [ 
      { 
       "GroupCount": 1, 
       "GroupID": 101, 
       "GroupName": "Machine11" 
      }, 
      { 
       "GroupCount": 6, 
       "GroupID": 201, 
       "GroupName": "Machine12" 
      }, 
      { 
       "GroupCount": 1, 
       "GroupID": 301, 
       "GroupName": "Machine13" 
      }, 
      { 
       "GroupCount": 1, 
       "GroupID": 501, 
       "GroupName": "Machine14" 
      }, 
      { 
       "GroupCount": 7, 
       "GroupID": 701, 
       "GroupName": "Machine15" 
      }, 
      { 
       "GroupCount": 1, 
       "GroupID": 901, 
       "GroupName": "Machine16" 
      }, 
      { 
       "GroupCount": 1, 
       "GroupID": 1001, 
       "GroupName": "Machine17" 
      } 
     ], 
     "Status": 0 
    } 
} 

向具备的属性GroupCount，组ID和组名创建的对象。

这里是我的代码：

if (request.responseStatusCode >= 200 && request.responseStatusCode < 300) 
{ 
    NSData *responseData = [request responseData]; 
    NSError* error; 
    NSDictionary* jsonOverview = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; 
    NSString *resultStatusString = jsonOverview[@"GetMachineOverviewResult"][@"Status"]; 
    int resultStatus = [resultStatusString intValue]; 
    NSDictionary *parsedObject = jsonOverview[@"GetMachineGroupsResult"]; 

    NSMutableArray *groups = [[NSMutableArray alloc] init]; 
    NSArray *results = [parsedObject valueForKey:@"MachineGroups"]; 
    NSLog(@"Count %lu", (unsigned long)results.count); //results.count = 7 

    for (NSDictionary *parseDic in results) { 
     MachineGroupList *machinegrouplist = [[MachineGroupList alloc] init]; 
     NSLog(@"%@", [parseDic class]); 
     NSLog(@"%@", parseDic); 
     for (NSString *key in parseDic) { 
      if ([machinegrouplist respondsToSelector:NSSelectorFromString(key)]) { 
       [machinegrouplist setValue:[parseDic valueForKey:key] forKey:key]; 
     } 

     [groups addObject:machinegrouplist]; 
    } 
    } 
    NSLog (@"GroupObjects %lu", (unsigned long)[groups count]); //groups count = 21 

出于某种原因，我无法捉摸，它分析每个项目三次，我结束了21个对象，而不是7.我知道这将是一些简单的这里的专家之一，但我是新来的这一切，真的很感谢这里的帮助，谢谢。

编辑： 非常感谢，这里是它现在的样子，它的工作原理.. addobject是在错误的部分！

for (NSDictionary *parseDic in results) 
    { 
     MachineGroupList *machinegrouplist = [[MachineGroupList alloc] init]; 
     NSLog(@"%@", [parseDic class]); 
     NSLog(@"%@", parseDic); 
     for (NSString *key in parseDic) 
      { 
      if ([machinegrouplist respondsToSelector:NSSelectorFromString(key)]) 
       { 
        [machinegrouplist setValue:[parseDic valueForKey:key] forKey:key]; 
       } 
       //[groups addObject:machinegrouplist]; 
      } 
     [groups addObject:machinegrouplist]; 
    } 
    NSLog (@"GroupObjects %lu", (unsigned long)[groups count]); //groups count = 7 

Answer 1

发生了以下事情。首先，让我们注释掉一些代码的最后行，使它看起来像这样：

for (NSDictionary *parseDic in results) { 
    //MachineGroupList *machinegrouplist = [[MachineGroupList alloc] init]; 
    NSLog(@"%@", [parseDic class]); 
    //NSLog(@"%@", parseDic); 
    //for (NSString *key in parseDic) { 
    // if ([machinegrouplist respondsToSelector:NSSelectorFromString(key)]) { 
    //  [machinegrouplist setValue:[parseDic valueForKey:key] forKey:key]; 
    // } 

    // [groups addObject:machinegrouplist]; 
    //} 
} 
//NSLog (@"GroupObjects %lu", (unsigned long)[groups count]); //groups count = 21 

你会本身，你遍历词典，各自有对象。

现在，注释掉以前的NSLog，取消注释内循环，并在该循环内添加一个NSLog，以查看您正在迭代的内容。

for (NSDictionary *parseDic in results) { 
    //MachineGroupList *machinegrouplist = [[MachineGroupList alloc] init]; 
    //NSLog(@"%@", [parseDic class]); 
    //NSLog(@"%@", parseDic); 
     for (NSString *key in parseDic) { 
    // if ([machinegrouplist respondsToSelector:NSSelectorFromString(key)]) { 
    //  [machinegrouplist setValue:[parseDic valueForKey:key] forKey:key]; 
    // } 

    // [groups addObject:machinegrouplist]; 
     NSLog(@"key: %@", key); 
    } 
} 
//NSLog (@"GroupObjects %lu", (unsigned long)[groups count]); //groups count = 21 

你迭代的每个 7个字典的3个对象，并因为你正在添加的每个对象组if ([machinegrouplist respondsToSelector:NSSelectorFromString(key)])之外，你最终将到组

干杯。