NSDictionay

ディクショナリ（連想配列）

値, キー, 値, キーで生成

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
                      @"miro", @"name",
                      [NSNumber numberWithInt:8], @"age",
                      @"red" , @"color",
                      nil];

配列で生成

[[NSArray]] *keys = [NSArray arrayWithObjects:
                 @"name",
                 @"age",
                 @"color",
                 nil];
NSArray *vals = [NSArray arrayWithObjects:
                 @"futaba",
                 [NSNumber numberWithInt:4],
                 @"white",
                 nil];
NSDictionary *dict = [NSDictionary dictionaryWithObjects:vals forKeys:keys];

取得（ない場合はnil）

 id obj1 = [dict1 objectForKey:@"name"];

値とキーを配列として取得

NSArray *kArr = [dict1 allKeys];
NSArray *vArr = [dict1 allValues];

要素数を取得

int dictCount = [dict1 count];

比較

BOOL isDictEquals = [dict1 isEqualToDictionary:dict2];