How to update NSMutableDictionary?

Question

I have an NSMutableDictionary.

NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

I have to update an element in that dictionary. How i can do that?

Basir

depends what you mean by update... – Villiers

i have to remove an object and insert another value for a key.This NSMutableDictionary is a plist of application settings of user. User will change it frequently. – Basir

Answer 1

Please refer to the API here

First retrieve the objects using

[dict objectForKey:@"key"];

Later, you can set them back using:

- (void)setObject:(id)anObject forKey:(id)aKey
- (void)setValue:(id)value forKey:(NSString *)key

Grandeur

thanks. i tried like this. it worked.. [plistDict removeObjectForKey:@"name"] ; [plistDict setObject:@"my name" forKey:@"name"]; – Basir

You don't need to remove the object for a key before setting the new value. – Palpable

i need only [plistDict setObject:@"my name" forKey:@"name"]; ? ok. i will try this .Thanks. – Basir

Answer 2

dictionary only allows you to have one objects for each key so if you use "set object for key" it will update the current one

Marcasite

Answer 3

NSMutableDictionary's method addEntriesFromDictionary.

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSMutableDictionary_Class/Reference/Reference.html

If both dictionaries contain the same key, the receiving dictionary’s previous value object for that key is sent a release message, and the new value object takes its place.

Elmore