在自定义表视图控制器中的响应中加载数据时的异常错误IOS

Question

做了一个自定义表视图控制器，其中调用viewDidLoad方法中的服务。该服务被调用一些参数，它是GET请求。响应即将细但它示出了一个异常错误此，终止应用程序由于未捕获的异常

“NSUnknownKeyException”，原因：“[< __NSCFString 0x60000036a140> valueForUndefinedKey：]：这个类不是关键值coding-符合关键数据。“

从服务我的回答是这

{"data":[{"id":"139559","first_name":"Shoaib Anwar","last_name":null,"address":null,"mobile":"03233008757","city":null,"date":"2017-08-10","date_of_birth":"1992-08-10"}]}.

应用程序崩溃的时候，我很困惑，为什么它显示此错误。

我的代码是这样的，

NSString *savedValue = [[NSUserDefaults standardUserDefaults] 
          stringForKey:@"number"]; 
    NSString *[email protected]"My Url"; 
    NSString *string3 = [url stringByAppendingString:savedValue]; 

    NSString *lastArray = @"&type=json"; 
    string3 = [string3 stringByAppendingString:lastArray]; 
    NSLog(@"Mmm %@",savedValue); 
    NSLog(@"Mmm %@",string3); 

    NSString *targetUrl = [NSString stringWithFormat:@"%@",string3]; 
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; 
    [request setHTTPMethod:@"GET"]; 
    [request setURL:[NSURL URLWithString:targetUrl]]; 

    [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler: 
     ^(NSData * _Nullable data, 
     NSURLResponse * _Nullable response, 
     NSError * _Nullable error) { 

      NSString *myString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 
      NSLog(@"Data received: %@", myString); 
      NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data 
                   options:NSJSONReadingMutableContainers 
                   error:nil]; 
      NSString *value = json[@"data"]; 



    _Ids = [NSMutableArray array]; 

    for (NSDictionary * oneCustomer in value) 
    { 
     // Create a new Customer record 

     ViewProfile * newCustomer = [[ViewProfile alloc] init]; 



     newCustomer.ids = [oneCustomer objectForKey:@"id"]; 
     NSLog(@"ID: %@ ", newCustomer.ids); 

     newCustomer.fname = [oneCustomer objectForKey:@"first_name"]; 
     NSLog(@"Fname: %@ ", newCustomer.fname); 

     newCustomer.lname = [oneCustomer objectForKey:@"last_name"]; 

     NSLog(@"Lname: %@ ", newCustomer.lname); 

     newCustomer.address = [oneCustomer objectForKey:@"address"]; 
     NSLog(@"Address: %@ ", newCustomer.address); 

     newCustomer.mobile = [oneCustomer objectForKey:@"mobile"]; 
     NSLog(@"Mobile: %@ ", newCustomer.mobile); 

     newCustomer.city = [oneCustomer objectForKey:@"city"]; 
     NSLog(@"City: %@ ", newCustomer.city); 

     newCustomer.date = [oneCustomer objectForKey:@"date"]; 
     NSLog(@"Date: %@ ", newCustomer.date); 

     newCustomer.dob = [oneCustomer objectForKey:@"date_of_birth"]; 
     NSLog(@"DOB: %@ ", newCustomer.dob); 

     // Add our new Customer record to our NSMutableArray 
     [_Ids addObject:newCustomer]; 

    } 
    dispatch_async(dispatch_get_main_queue(), ^{ 
     // This code will run once the JSON-loading section above has completed. 

     [self.tableView reloadData]; 
    }); 




    NSString *status=[myString valueForKey:@"data"]; 
    NSLog(@"Status:%@",status); 




}] resume]; 

Answer 1

您的回应是一个JSON字符串。

尝试将myString属性转换为NSData类型，然后传递给NSJsonSerialisation类。

NSData *jsonData = [myString dataUsingEncoding:NSUTF8StringEncoding]; 

NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil]; 

希望这有助于:)

Answer 2

你应该注释此行

NSString *status=[myString valueForKey:@"data"]; 

或检查你的故事板或XIB

是你有标签或按钮，如图像连接

Answer 3

请尝试下面的代码并根据您的要求进行更新。

NSString *myString = @"{\"data\":[{\"id\":\"139559\",\"first_name\":\"Shoaib Anwar\",\"last_name\":null,\"address\":null,\"mobile\":\"03233008757\",\"city\":null,\"date\":\"2017-08-10\",\"date_of_birth\":\"1992-08-10\"}]}"; 

NSData *data = [myString dataUsingEncoding:NSUTF8StringEncoding]; 
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil]; 

NSArray *value = json[@"data"]; 

for (NSDictionary * oneCustomer in value) 
{ 
    // Create a new Customer record 

    NSLog(@"ID: %@ ", [oneCustomer objectForKey:@"id"]); 
    NSLog(@"Fname: %@ ", [oneCustomer objectForKey:@"first_name"]); 
} 

崩溃问题的原因NSString *status=[myString valueForKey:@"data"];