正方形の場合、setCornerRadius に辺の長さの半分を渡す。
[view.layer setCornerRadius:CGRectGetWidth(view.frame) * 0.5f];
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正方形の場合、setCornerRadius に辺の長さの半分を渡す。
[view.layer setCornerRadius:CGRectGetWidth(view.frame) * 0.5f];
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