iOS NSMutableString返回奇怪的字符

我創建了幾個單詞的數組，然後將所有單詞放入可變字符串中，然後將此字符串的每個字符的可變數組。然而，「wordSplitted」，即字符的可變數組給隨機加擾的字符在模擬器應用程序的每次啓動，顯示在日誌中：iOS NSMutableString返回奇怪的字符

2012-07-22 09:12:01.108 xxx[4484:b603] wordSplitted contains: (
    "", 
    "", 
    "\U221e", 
    "-", 
    G, 
    N, 
    P, 
    "", 
    "" 
)

應當B，I，L，H，U， k，s，k，j。

NSArray *threeWords = [NSArray arrayWithObjects:@"bil", @"huk", @"skje", nil]; 


    NSMutableString *allTogether = [[NSMutableString alloc]init]; 

    /* 
    for (NSString *s in threeWords) 
    { 
     [allTogether appendString:s]; 
    } 
    */ 

    for (int b = 0; b < [threeWords count]; b++) 
    { 
     [allTogether appendString:[threeWords objectAtIndex:b]]; 
    } 
    NSLog (@"allTogether contains %@", allTogether); 

    //[threeWords release]; 
    [allTogether release]; 

    NSMutableArray *wordSplitted = [[NSMutableArray alloc]init]; 

//this function gives me headache 
     for (int a = 0; a < 9; a ++) 
     { 
      //gives also scrambled characters 

     //[wordSplitted addObject:[NSString stringWithFormat:@"%C",[allTogether characterAtIndex:a]]]; 

     NSRange range = {a,1}; 

     [wordSplitted addObject:[allTogether substringWithRange:range]]; 

    } 

    NSLog (@"wordSplitted contains: %@", wordSplitted);

如何顯示正常字符如字母？

來源

2012-07-22 wagashi