将JSON字符串解析为三个数组Objective C

我正尝试使用从目标文本c中读取的数据。我从文本文件中读取的数据是：将JSON字符串解析为三个数组Objective C

{"aps":{"alert":"Test 1!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 2!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 3!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 4!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}|{"aps":{"alert":"Test 5!","sound":"beep.wav","badge":5,"Type":"Banking"},"acme1":"bar","acme2":42}

读取一次，我将文件分割成一个阵列的分隔符“|”。然后，我想进一步将其分为3个不同的阵列：基于“类型”关键字的银行业务，欺诈和投资。但是，我似乎无法达到解析JSON字符串，一旦我把它分成数组。我的观点没有负荷的方法如下：

- (void)viewDidLoad { 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *fileName = [NSString stringWithFormat:@"%@/AccountNotifications.txt", documentsDirectory]; 
    NSString *fileContents = [[NSString alloc] initWithContentsOfFile:fileName usedEncoding:nil error:nil]; 
    NSArray *fileData = [fileContents componentsSeparatedByString:@"|"]; 

    if (fileContents != NULL) 
    { 
     bankingNotifications = [[NSMutableArray alloc] init]; 
     fraudNotifications = [[NSMutableArray alloc] init]; 
     investmentNotifications = [[NSMutableArray alloc] init];   

     for (i = 0; i < [fileData count]; i++) 
     { 
      NSString *notification = fileData[i]; 
      NSDictionary *json = [notification JSONValue]; 
      NSArray *items = [json valueForKeyPath:@"aps"]; 

      if ([[[items objectAtIndex:i] objectForKey:@"Type"] isEqual: @"Banking"]) 
      { 
       [bankingNotifications addObject:fileData[i]]; 
       NSLog(@"Added object to banking array"); 
      } 

      if ([[[items objectAtIndex:i] objectForKey:@"Type"] isEqual: @"Fraud"]) 
      { 
       [fraudNotifications addObject:fileData[i]]; 
       NSLog(@"Added object to fraud array"); 

      } 

      if ([[[items objectAtIndex:i] objectForKey:@"Type"] isEqual: @"Investment"]) 
      { 
       [investmentNotifications addObject:fileData[i]]; 
       NSLog(@"Added object to investment array"); 

      } 
     } }

有这三个行错误：

NSString *notification = fileData[i]; 
    NSDictionary *json = [notification JSONValue]; 
    NSArray *items = [json valueForKeyPath:@"aps"];

能否请你帮我解析JSON字符串成三个可变数组？我得到的错误是：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryM objectAtIndex:]: unrecognized selector sent to instance 0x1d59db30'

来源

2013-02-28 Sulaiman Majeed

'' - [__ NSDictionaryM objectAtIndex：]：无法识别的选择器发送到实例'意味着你正在尝试像字典一样处理字典。（仔细阅读消息，你可以看到。）你分离的字符串代表JSON“对象”（字典），而不是数组（而下一层也是“对象”），所以这可能是你的问题。（和YY是分开的字符串，只是将它们放入一个包含JSON数组中？） – 2013-02-28 22:29:15

这是你开始出错的地方：'NSArray * items = [json valueForKeyPath：@“aps”];'。该操作的结果是NSDictionary，而不是NSArray。 – 2013-02-28 22:31:49

不应该只是将3个数组放在文件中而不是使用'|'？这将使它成为一个合格的JSON文件。 – nielsbot 2013-02-28 22:47:44

关键“APS”的值是一个字典。

NSDictionary *item = [json valueForKeyPath:@"aps"]; 

    if ([[item objectForKey:@"Type"] isEqualToString: @"Banking"]) 
    { 
     [bankingNotifications addObject:notification]; 
     NSLog(@"Added object to banking array"); 
    } 
    else if ([[item objectForKey:@"Type"] isEqualToString: @"Fraud"]) 
    { 
     [fraudNotifications addObject:notification]; 
     NSLog(@"Added object to fraud array"); 
    } 
    else if ([[item objectForKey:@"Type"] isEqualToString: @"Investment"]) 
    { 
     [investmentNotifications addObject:notification]; 
     NSLog(@"Added object to investment array"); 
    }

来源

2013-02-28 22:44:25 nkongara

如果您创建文本文件了，我建议你创建一个有效的JSON对象（如您的数据看起来应该是JSON），让您的数据非常干净。与此类似：

{"aps":[{"type":"Banking","badge":5},{"Type":"Fraud","badge":12}]}

那么你可以做以下（此代码没有经过测试，它可以是你已经修改了一点），但我希望你会得到一个想法:)

NSError* error  = nil; 
NSDictionary* dict = nil; 
//serialising the jsonobject to a dictionary 
dict = [NSJSONSerialization JSONObjectWithData:fileContents 
               options:kNilOptions 
               error:&error]; 
bankingNotifications = [[NSMutableArray alloc] init]; 
fraudNotifications = [[NSMutableArray alloc] init]; 
investmentNotifications = [[NSMutableArray alloc] init]; 

if (dict) { 
    NSArray *dataArray = [dict objectForKey:@"aps"]; 
    NSDictionary* siteData = nil; 
    NSEnumerator* resultsEnum = [dataArray objectEnumerator]; 
    while (siteData = [resultsEnum nextObject]) 
    { 
     // 
     if([[siteData objectForKey:@"Type"] isEqualToString: @"Banking"]) { 
      [bankingNotifications addObject:notification]; 
      NSLog(@"Added object to banking array"); 
     } else if ([[siteData objectForKey:@"Type"] isEqualToString: @"Fraud"]) 
     { 
      [fraudNotifications addObject:notification]; 
      NSLog(@"Added object to fraud array"); 
     } 
     else if ([[siteData objectForKey:@"Type"] isEqualToString: @"Investment"]) 
     { 
      [investmentNotifications addObject:notification]; 
      NSLog(@"Added object to investment array"); 
     } 

    } 
}

来源

2013-03-01 01:24:41 nanako

将JSON字符串解析为三个数组Objective C

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