NSMutableDictionary關鍵值檢查問題

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我在NSMutableDictionary檢索密鑰和值檢查，我做了這個代碼有點混淆。NSMutableDictionary關鍵值檢查問題

NSMutableDictionary *testDictionary=[NSMutableDictionary dictionary]; 
     // NSMutableDictionary *testDictionary=[[NSMutableDictionary alloc]init]; 

     [testDictionary setObject:@"Muhammed Musthafa" forKey:@"10005"]; 
     [testDictionary setObject:@"Lubaba p" forKey:@"10006"]; 
     [testDictionary setObject:@"Sahala Banu" forKey:@"10007"]; 
     [testDictionary setObject:@"Vishnu k" forKey:@"10008"]; 
     [testDictionary setObject:@"Shabeer PP" forKey:@"10009"]; 
     [testDictionary setObject:@"Sabeehath " forKey:@"10010"]; 
     [testDictionary setObject:@"Anusha GS" forKey:@"10011"]; 
     [testDictionary setObject:@"JINI KS" forKey:@"10012"]; 
     [testDictionary setObject:@"Athulya T" forKey:@"10013"]; 
     [testDictionary setObject:@"Midhun KS" forKey:@"10014"]; 

     for(NSString *kk in testDictionary) 
     { 
      NSString *fName; 
      if([email protected]"10006") 
      { 
       fName=[testDictionary objectForKey:kk]; 

      } 
      if([email protected]"10007") 
      { 
       fName=[testDictionary objectForKey:kk]; 

      } 
      if([email protected]"10013") 
      { 
       fName=[testDictionary objectForKey:kk]; 
      } 
      NSLog(@"KEY=====%@ and Value====%@",kk,fName); 

     } 
The out put value : 

    2011-11-17 10:49:37.054 ArchiveData[2539:207] KEY=====10013 and Value==== 
    2011-11-17 10:49:37.055 ArchiveData[2539:207] KEY=====10006 and Value==== 
    2011-11-17 10:49:37.056 ArchiveData[2539:207] KEY=====10008 and Value==== 
    2011-11-17 10:49:37.056 ArchiveData[2539:207] KEY=====10010 and Value==== 
    2011-11-17 10:49:37.057 ArchiveData[2539:207] KEY=====10012 and Value==== 
    2011-11-17 10:49:37.057 ArchiveData[2539:207] KEY=====10014 and Value==== 
    2011-11-17 10:49:37.058 ArchiveData[2539:207] KEY=====10005 and Value==== 
    2011-11-17 10:49:37.059 ArchiveData[2539:207] KEY=====10007 and Value==== 
    2011-11-17 10:49:37.060 ArchiveData[2539:207] KEY=====10009 and Value==== 
    2011-11-17 10:49:37.061 ArchiveData[2539:207] KEY=====10011 and Value====

爲什麼這三{（KK == @ 「10006」）如果（KK == @ 「10007」）如果（KK == @ 「10013」）}如果狀態換貨返回false？
還有其他的方法來檢查這樣的ID鍵嗎？
我看到相同類型的編碼在一些其他編碼中工作正常，所以這取決於任何其他配置？
我該如何檢查特定鍵== @「一些鍵值」？

來源

2011-11-17 Musthafa P P

我無法重現您的問題。你的代碼中可能還有其他東西不在問題中顯示。 – 2011-11-17 06:50:00

代碼：

NSMutableDictionary *testDictionary=[NSMutableDictionary dictionary]; 
    // NSMutableDictionary *testDictionary=[[NSMutableDictionary alloc]init]; 

    [testDictionary setObject:@"Muhammed Musthafa" forKey:@"10005"]; 
    [testDictionary setObject:@"Lubaba p" forKey:@"10006"]; 
    [testDictionary setObject:@"Sahala Banu" forKey:@"10007"]; 
    [testDictionary setObject:@"Vishnu k" forKey:@"10008"]; 
    [testDictionary setObject:@"Shabeer PP" forKey:@"10009"]; 
    [testDictionary setObject:@"Sabeehath " forKey:@"10010"]; 
    [testDictionary setObject:@"Anusha GS" forKey:@"10011"]; 
    [testDictionary setObject:@"JINI KS" forKey:@"10012"]; 
    [testDictionary setObject:@"Athulya T" forKey:@"10013"]; 
    [testDictionary setObject:@"Midhun KS" forKey:@"10014"]; 

    for(NSString *kk in testDictionary) 
    { 
     NSString *fName; 
     if([kk isEqualToString:@"10006"]) 
     { 
      fName=[testDictionary objectForKey:kk]; 

     } 
     if([kk isEqualToString: @"10007"]) 
     { 
      fName=[testDictionary objectForKey:kk]; 

     } 
     if([kk isEqualToString:@"10013"]) 
     { 
      fName=[testDictionary objectForKey:kk]; 
     } 
     NSLog(@"KEY=====%@ and Value====%@",kk,fName); 

    }

輸出爲您的代碼。

2011-11-17 12:47:59.910 test[12512:a0f] KEY=====10008 and Value====(null) 
2011-11-17 12:47:59.910 test[12512:a0f] KEY=====10010 and Value====(null) 
2011-11-17 12:47:59.911 test[12512:a0f] KEY=====10012 and Value====(null) 
2011-11-17 12:47:59.911 test[12512:a0f] KEY=====10014 and Value====(null) 
2011-11-17 12:47:59.912 test[12512:a0f] KEY=====10005 and Value====(null) 
2011-11-17 12:47:59.912 test[12512:a0f] KEY=====10007 and Value====Sahala Banu 
2011-11-17 12:47:59.912 test[12512:a0f] KEY=====10009 and Value====Sahala Banu 
2011-11-17 12:47:59.913 test[12512:a0f] KEY=====10011 and Value====Sahala Banu 
2011-11-17 12:47:59.913 test[12512:a0f] KEY=====10013 and Value====Athulya T 
2011-11-17 12:47:59.913 test[12512:a0f] KEY=====10006 and Value====Lubaba p

它工作正常。在10007之後，您沒有10009和10011的條件。所以fName值不會因此而改變。
當您使用==運算符時，您正在比較指針值。只有當你比較的對象是同一個內存地址的完全相同的對象時，這纔會起作用。

來源

2011-11-17 07:23:18

你可能會更好的，爲了做一個適當的字符串比較，而不是比較指針使用[kk isEqualToString:@"10006"]比較字符串。

來源

2011-11-17 05:37:52

+1 - 另外，請參閱此鏈接以更好地解釋字符串文字：http://stackoverflow.com/questions/8032375/difference-between-nsstring-literals/8032400#8032400 – bryanmac

當我使用[kk isEqualToString ：@ 「10006」]？所以問題是其他事情... –

NSMutableDictionary關鍵值檢查問題

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