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@tomokr
Created November 14, 2013 15:19
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iOSアプリの部品の表示/非表示を切り替える方法 ref: http://qiita.com/tomokr/items/130153809fdea502f62d
btn.alpha = 0; //表示されない
btn.alpha = 1; //表示される
[self.view addSubview:btn];
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