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UIButtonのフォントサイズを横幅に合わせて調整してくれる設定

Last updated at Posted at 2019-10-25

コードから

let button = UIButton()
button.titleLabel?.adjustsFontSizeToFitWidth = true
button.titleLabel?.minimumScaleFactor = 0.3 // 30%まで小さくなる

Stroryboardから設定出来るようにするextention

@IBDesignable
extension UIButton {
    @IBInspectable var adjustsFontSizeToFitWidth: Bool {
        get { return titleLabel?.adjustsFontSizeToFitWidth ?? false }
        set { titleLabel?.adjustsFontSizeToFitWidth = newValue }
    }
    @IBInspectable var minimumScaleFactor: CGFloat {
        get { return titleLabel?.minimumScaleFactor ?? 1.0 }
        set { titleLabel?.minimumScaleFactor = newValue }
    }
}
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