將JSON字符串解析爲三個數組Objective C

我正嘗試使用從目標文本c中讀取的數據。我從文本文件中讀取的數據是：將JSON字符串解析爲三個數組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}

讀取一次，我將文件分割成一個陣列的分隔符「|」。然後，我想進一步將其分爲3個不同的陣列：基於「類型」關鍵字的銀行業務，欺詐和投資。但是，我似乎無法達到解析JSON字符串，一旦我把它分成數組。我的觀點沒有負荷的方法如下：

- (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"); 

      } 
     } }

有這三個行錯誤：

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

能否請你幫我解析JSON字符串成三個可變數組？我得到的錯誤是：

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

來源

2013-02-28 Sulaiman Majeed

'' - [__ NSDictionaryM objectAtIndex：]：無法識別的選擇器發送到實例'意味着你正在嘗試像字典一樣處理字典。（仔細閱讀消息，你可以看到。）你分離的字符串代表JSON「對象」（字典），而不是數組（而下一層也是「對象」），所以這可能是你的問題。（和YY是分開的字符串，只是將它們放入一個包含JSON數組中？） – 2013-02-28 22:29:15

這是你開始出錯的地方：'NSArray * items = [json valueForKeyPath：@「aps」];'。該操作的結果是NSDictionary，而不是NSArray。 – 2013-02-28 22:31:49

不應該只是將3個數組放在文件中而不是使用'|'？這將使它成爲一個合格的JSON文件。 – nielsbot 2013-02-28 22:47:44

關鍵「APS」的值是一個字典。

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"); 
    }

來源

2013-02-28 22:44:25 nkongara

如果您創建文本文件了，我建議你創建一個有效的JSON對象（如您的數據看起來應該是JSON），讓您的數據非常乾淨。與此類似：

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

那麼你可以做以下（此代碼沒有經過測試，它可以是你已經修改了一點），但我希望你會得到一個想法:)

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"); 
     } 

    } 
}

來源

2013-03-01 01:24:41 nanako

將JSON字符串解析爲三個數組Objective C

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