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UIBarButtonItemで中にUIBarButtonがなくてなくしたい時

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UIBarButtonが中にあれば、

UIBARBUTTONNAME.hidden = YES;

でボタンを隠せるが、無いときはできないので以下のようにwidthを0.1にすれば隠れる。

UIBARBUTTONITEM.width = 0.1;

また表示したいときは0.0(auto width)にすればいい

UIBARBUTTONITEM.width = 0.0;

ただこれだとボタンが非表示の時でもクリックできちゃうのが問題点、、、

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