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UILabelやUIViewでぴったりのサイズを取得する

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UILabelとかに文字を挿入した後に、それがぴったり入るサイズを計算したい場合があります。
このような場合、sizeToFitを実行することでビューのサイズが最適なものに変更されます。

[_titleLabel sizeToFit];

ただ、変更せずにサイズを取得したい場合や、
そのサイズを元に変更を加える場合などが存在します。

このような場合に使えるのがsizeThatFitsで、
自分のサイズを変更せずに、要素がぴったり入るサイズを返してくれます。

CGSize maxSize = CGSizeMake(parentWidth,parentHeight);
CGSize titleLabelSize = [_titleLabel sizeThatFits:maxSize];
pfn
Make the real world computable / 現実世界を計算可能にする
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