NSDictionary dictionaryWithObjects example ios

dictionaryWithObjects :forKeys:

Creates and returns a dictionary containing entries constructed from the contents of an array of keys and an array of values.

+ (id)dictionaryWithObjects:(NSArray *)objects forKeys:(NSArray *)keys

Parameters of [NSDictionary dictionaryWithObjects]

objects

An array containing the values for the new dictionary.

keys

An array containing the keys for the new dictionary. Each key is copied (usingcopyWithZone:; keys must conform to the NSCopying protocol), and the copy is added to the dictionary.

Return Value

A new dictionary containing entries constructed from the contents of objects and keys.

Discussion of [NSDictionary dictionaryWithObjects]

This method steps through the objects and keys arrays, creating entries in the new dictionary as it goes. An NSInvalidArgumentException is raised if objects and keys don’t have the same number of elements.

Example of [NSDictionary dictionaryWithObjects]

NSArray *keys = [NSArray arrayWithObjects:@"key1", @"key2", nil];
NSArray *objects = [NSArray arrayWithObjects:@"value1", @"value2", nil];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects :objects 
                                                       forKeys:keys];

Example of [NSDictionary dictionaryWithObjects]

NSDictionary *activeMissions = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects:tiger, bull, peacock, nil]
                                                  forKeys: [NSArray arrayWithObjects:@tiger, @"bull", @"peacock", nil]];