如何更改NSdictionary中的值？

-3

「等級1-2打開」時如何更改值「等級1-2關閉」？我必須刪除它並添加新的值？或者簡單地覆蓋？我該怎麼辦？如何更改NSdictionary中的值？

感謝

NSDictionary *dict = [[NSUserDefaults standardUserDefaults] dictionaryForKey:@"key_open_levels"]; 

     dict = [NSDictionary dictionaryWithObjectsAndKeys: 
        @"open", @"level 1-1", 
        @"closed", @"level 1-2", 
        @"closed", @"level 1-3", 
        @"closed", @"level 1-4", 
        @"closed", @"level 1-5", 
        @"closed", @"level 1-6", 
        @"closed", @"level 1-7", 
        @"closed", @"level 1-8", 
        @"closed", @"level 1-9", 
        @"closed", @"level 1-10", nil]; 

      // NSString *customerDict ; 
      [[NSUserDefaults standardUserDefaults] setValue:dict forKey:@"key_open_levels"]; 


      if ([[dict valueForKey:@"level 1-2"] isEqualToString:@"closed" ]){ 

      //what should I write here? 

      }else{ 

}

來源

2014-02-14 catalunya

這不是一個可變的字典，所以它創建後，你不能改變任何東西。 –

怎麼樣？你可以舉例 – catalunya

嘗試..

NSMutableDictionaray *dict = [NSMutableDictionaray dictionaryWithObjectsAndKeys: 
         @"open", @"level 1-1", 
         @"closed", @"level 1-2", 
         @"closed", @"level 1-3", 
         @"closed", @"level 1-4", 
         @"closed", @"level 1-5", 
         @"closed", @"level 1-6", 
         @"closed", @"level 1-7", 
         @"closed", @"level 1-8", 
         @"closed", @"level 1-9", 
         @"closed", @"level 1-10", nil]; 

[dict removeObjectForKey:@"level 1-2"]; 
[dict setObject:@"open" forKey:@"level 1-2"];

來源

2014-02-14 06:28:01 Mani

的NSDictionary是不可改變的所以不能更改值。 NSMutableDictionary是可變的，只有你添加，刪除performes可以完成。

使用@Amar表示鏈接。它有幫助

來源

2014-02-14 06:27:12 codercat

In your code below [[NSUserDefaults standardUserDefaults] setValue:dict forKey:@"key_open_levels"]; 

Use below line of code than it will work. 

[defaults synchronize];

也使用NSMutableDictionary而不是NSDictionary。

來源

2014-02-14 06:27:19 rahul

如果您需要添加下面的代碼整個NSDictionary到NSMutableDictionary

NSMutableDictionary *newDict = [[NSMutableDictionary alloc] init]; 
[newDict addEntriesFromDictionary: dict]; 
[newDict setObject:@"<value>" forKey:@"<Key Name>"]; 
NSLog(@"%@", newDict);

來源

2014-02-14 06:27:30 iPatel

你必須NSDictionary轉換爲NSMutableDictionary。

或者

你有用戶NSMutableDictionary到位NSDictionary的。

之後，您可以更改NSMutableDictionary中的值。

NSMutableDictionary *mutableDict = [dict mutableCopy];

來源

2014-02-14 06:29:12

蘋果爲我們提供NSMutableDictionary和NSDicitionary存儲在鍵值對數據，其中NSMutableDicitonary編輯。這取決於使用，如果數據會改變你應該使用NSMutableDictionary而不是創建NSDictionary或

例如：

NSMutableDictionary *dict2 = [NSMutableDictionary dictionaryWithObjectsAndKeys: 
     @"open", @"level 1-1", 
     @"closed", @"level 1-2", 
     @"closed", @"level 1-3", 
     @"closed", @"level 1-4", 
     @"closed", @"level 1-5", 
     @"closed", @"level 1-6", 
     @"closed", @"level 1-7", 
     @"closed", @"level 1-8", 
     @"closed", @"level 1-9", 
     @"closed", @"level 1-10", nil]; 

[dict2 setObject:@"open" forKey:@"level 1-2"]; //<---- Set value at later stage

編輯

 // Archive data to save 
     NSMutableArray *archiveArray = [NSMutableArray array]; 
     NSData *personEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:completeResponse]; 
     [archiveArray addObject:personEncodedObject]; 

     // Set in userDefault 
     [[NSUserDefaults standardUserDefaults] setValue:archiveArray forKey:@"key_open_levels"]; 
     [[NSUserDefaults standardUserDefaults] synchronize]; 


     // Get archived data from userdefault 
     archiveArray = [[NSUserDefaults standardUserDefaults] valueForKey:@"key_open_levels"]; 

     // Unarchive and use it 
     NSLog(@"%@", [NSKeyedUnarchiver unarchiveObjectWithData:[archiveArray objectAtIndex:0]]);

來源

2014-02-14 06:36:06 NeverHopeless

以及如何使用NSUserDefaults standardUserDefaults來保存數據？ – catalunya

completeResponse它是NSString？它是空的？ – catalunya

-1

，你可以這樣做這.. nsdictionary是靜態的。一旦它創建，我們就不能設置對象。把它當作一個不可修改的詞典。你可以改變它。 NSMutableDictionary * dict = [[NSMutableDictionary alloc] init];

dict = [NSMutableDictionary dictionaryWithObjectsAndKeys: 
     @"open", @"level 1-1", 
     @"closed", @"level 1-2", 
     @"closed", @"level 1-3", 
     @"closed", @"level 1-4", 
     @"closed", @"level 1-5", 
     @"closed", @"level 1-6", 
     @"closed", @"level 1-7", 
     @"closed", @"level 1-8", 
     @"closed", @"level 1-9", 
     @"closed", @"level 1-10", nil]; 



[dict setObject:@"open" forKey:@"level 1-5"]; 

NSLog(@"%@",dict);

來源

2014-02-14 06:36:29 gajchtr

如何更改NSdictionary中的值？

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