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I have an NSMutableDictionary.
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
I have to update an element in that dictionary. How i can do that?
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The NSMutableDictionary class declares the programmatic interface to objects that manage mutable associations of keys and values. It adds modification operations to the basic operations it inherits from NSDictionary . NSMutableDictionary is “toll-free bridged” with its Core Foundation counterpart, CFMutableDictionary .
NSDictionary creates static dictionaries, and NSMutableDictionary creates dynamic dictionaries. (For convenience, the term dictionary refers to any instance of one of these classes without specifying its exact class membership.) A key-value pair within a dictionary is called an entry.
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
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
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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.
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