Objective-C Language NSMutableDictionary NSMutableDictionary Example
Example
+ dictionaryWithCapacity:
Creates and returns a mutable dictionary, initially giving it enough allocated memory to hold a given number of entries.
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:1];
NSLog(@"%@",dict);
- init
Initializes a newly allocated mutable dictionary.
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
NSLog(@"%@",dict);
+ dictionaryWithSharedKeySet:
Creates a mutable dictionary which is optimized for dealing with a known set of keys.
id sharedKeySet = [NSDictionary sharedKeySetForKeys:@[@"key1", @"key2"]]; // returns NSSharedKeySet
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithSharedKeySet:sharedKeySet];
dict[@"key1"] = @"Easy";
dict[@"key2"] = @"Tutorial";
//We can an object thats not in the shared keyset
dict[@"key3"] = @"Website";
NSLog(@"%@",dict);
OUTPUT
{
key1 = Eezy;
key2 = Tutorials;
key3 = Website;
}
Adding Entries to a Mutable Dictionary
- setObject:forKey:
Adds a given key-value pair to the dictionary.
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:@"Easy" forKey:@"Key1"];
NSLog(@"%@",dict);
OUTPUT
{
Key1 = Eezy;
}
- setObject:forKeyedSubscript:
Adds a given key-value pair to the dictionary.
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:@"Easy" forKeyedSubscript:@"Key1"];
NSLog(@"%@",dict);
OUTPUT { Key1 = Easy; }
