ios 如何更改NSdictionary 中的值？

how change values in NSdictionary?

提问by catalunya

How change value "level 1-2 closed" on "level 1-2 open"? I have to delete it and add new value? or simply overwrite? How can I do it?

如何在“1-2 级打开”上更改值“1-2 级关闭”？我必须删除它并添加新值？还是简单地覆盖？我该怎么做？

Thanks

谢谢

   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{

}

回答by Mani

Try below code..

试试下面的代码..

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

回答by iPatel

If you need to add your entire NSDictionaryto NSMutableDictionary

如果您需要将整个添加NSDictionary到NSMutableDictionary

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

回答by codercat

NSDictionary is immutable so can't change the value. NSMutableDictionary is mutable then only you add,delete performes can be done.

NSDictionary 是不可变的，所以不能改变它的值。NSMutableDictionary 是可变的，只有你添加，删除执行才能完成。

use @Amar said link . it helpful

使用@Amar 说的链接。它有帮助

回答by rahul

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

Use below line of code than it will work.

[defaults synchronize];

Also use NSMutableDictionary instead of NSDictionary.

也使用 NSMutableDictionary 而不是 NSDictionary。

回答by Rigel Networks

You have to convert NSDictionaryto NSMutableDictionary.

您必须转换NSDictionary为NSMutableDictionary.

Or

或者

You have to user NSMutableDictionaryin place of the NSDictionary.

您必须使用 userNSMutableDictionary代替NSDictionary.

After that you can able to change value in NSMutableDictionary.

之后，您可以更改NSMutableDictionary.

NSMutableDictionary *mutableDict = [dict mutableCopy];

回答by NeverHopeless

Apple provides us NSMutableDictionaryand NSDicitionaryto store data in key-value pair, in which NSMutableDicitonaryis editable. It depends on the use that if the data will be alter you should use NSMutableDictionaryinstead of creating NSDictionaryor [instanceOfNSDictionary mutableCopy]

苹果为我们提供了NSMutableDictionary与NSDicitionary在键值对存储数据，其中NSMutableDicitonary可编辑。这取决于使用，如果数据将被更改，您应该使用NSMutableDictionary而不是创建NSDictionary或[instanceOfNSDictionary mutableCopy]

For example:

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

EDIT

编辑

        // 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]]);

回答by gajchtr

you can do like this.. nsdictionary is static. we can't set object once it is created. take it as a nsmutabledictionary . you can chage it. NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];

你可以这样做.. nsdictionary 是静态的。一旦创建对象，我们就无法设置它。把它当作一个 nsmutabledictionary 。你可以改变它。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);