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MacRuby/RubymotionでObjective-Cのblocksにメソッドを渡す方法

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以下のようなコードをMacRuby/MotionRubyで呼び出す方法についてのメモです。

- void hoge(int num, void (^block)(char *str))
{
  /* blocksを利用した何らかの処理 */
}

一つはProc.newを利用した呼び出しです。

hoge(1, Proc.new{|str| ... })

ただProcオブジェクトが長くなるとしつこい書き方になってしまうので、メソッドに切り分けることもできます。Methodオブジェクトからto_procでProcオブジェクトに変換するやり方です。

def foo
  hoge(1, method(:bar).to_proc)
end

def bar(str)
  # ...
end

大体は素直にProc.newで書くのが良いと思いますが、通信に成功した場合と失敗した場合とでそれぞれクロージャを書くときはコードが長くなりがちなので、メソッド化するなどして、できるだけリーダブルに保ちたいものです。

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