June 27, 2003
[WWDC 2003] NSController
今回、Cocoaで一番嬉しい変更点がNSControllerの追加だ。キーノートでのInterface Builderのデモで明らかになったとおり、IBのパレットに新たにControllerオブジェクトが追加されるようになる。これにより、Model-View-Controllerの中でいままでほったらかしになっていたControllerレイヤーのコーディングがかなり簡単になることになる。（MVCの詳しい内容についてはアップルのドキュメントを参照。）
何が楽になるかと言えば、UIの細かい制御が必要なくなると言うことなのだ。例えば名前のリストと選択された名前の詳細な情報が表示されているとしよう。リストの中で名前がクリックされるたびに情報部分も更新しなくてはならない。また情報が変更されたらリストにも反映しなければならない。今まではこれは全部手作業で行うモノだった。全部プログラマがコツコツとプログラムを書いていたのだ。それを今回のNSControllerの導入で、プログラムを書かずにIBでちょちょいとバインドしてあげれば済むようになってしまったのだ。なんて楽なんだ。
だいたいこういうコードはどれも同じようなモノなのだ。あまり生産的な作業でもなく、見た目をキチンとしたUIに近づけるための努力なのだ。大事なことだからさぼるわけにもいかないけど、だったらアップルがサポートしてくれよー、という気持ちもあったのだ。なので今回の変更はとても嬉しいぞ。
IB自体は基本的にこれまでと大きくは変わっていない。モデルと同様にコントローラもインスタンスを作り、そのインスタンスを選択するとインスペクターにバインドの欄が追加される。ここで何とつないで、どういうイベント（？）をみて、なんのメッセージを送るのかを設定するだけである。コードは何一つ書かなくていい。
今回の拡張は本質的なIBの使われ方を変える可能性を持っていると思う。とりあえず今までのモノから大きく変わることはなかったが、今後はたぶんコントローラーをもっと隠してバインドをより直接的に行えるようなインターフェースに変わっていくのではないか、という気がするのだが、どうだろうか？
Posted by basuke at June 27, 2003 05:10 AM | トラックバックNSControllerが使えるのは朗報ですなぁ。UIのところで小一時間悩むのは普通だったので。
これとXcodeでかなり環境が良くなっていくことに安堵をしたり。
ま、頑張ってコード書くべ>お互いね(笑)>Basuke
#昨日横浜-阪神戦見に行ったら勝ったよ阪神。(^^v
Posted by: shachi at June 28, 2003 10:29 AMmake love not war
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