クラスに [], {} を実装する

iOS6 から使えます。

[]

下記のメソッドを定義します。

CustomClass.h

// id obj = custom[1]
- (id)objectAtIndexedSubscript:(NSUInteger)idx;
// custom[0] = @10
- (void)setObject:(id)obj atIndexedSubscript:(NSUInteger)idx;

CustomClass.m

- (id)objectAtIndexedSubscript:(NSUInteger)idx
{
  return object;
}
- (void)setObject:(id)obj atIndexedSubscript:(NSUInteger)idx
{
  ...
}

使うとき

Test.m

CustomClass *custom = [CustomClass new];
id obj    = custom[1];
custom[0] = @10;

{}

下記のメソッドを定義します。

CustomClass.h

// id obj     = custom[@1];
- (id)objectForKeyedSubscript:(id)key;
// custom[@1] = @0;
- (void)setObject:(id)anObject forKeyedSubscript:(id <NSCopying>)aKey;

CustomClass.m

- (id)objectForKeyedSubscript:(id)key
{
    return @"10";
}

- (void)setObject:(id)anObject forKeyedSubscript:(id <NSCopying>)aKey
{
    ...
}

使うとき

Test.m

CustomClass *custom = [CustomClass new];
id obj     = custom[@1];
custom[@1] = @0;

[], {}

上記二つを実装することで両方使えます。

Test.m

CustomClass *custom = [CustomClass new];

id arrayObj = custom[1];
custom[0]   = @10;

id dictObj = custom[@1];
custom[@1] = @0;