UITextField调整字体大小以适合高度

Question

我有UITextField：

let promoTextField: UITextField = {
     let textField = UITextField()
     textField.font = UIFont.systemFont(ofSize: 32, weight: UIFont.Weight.light)
     textField.placeholder = NSLocalizedString("PromoCode", comment: "")
     textField.textAlignment = .center
     textField.translatesAutoresizingMaskIntoConstraints = false
     textField.minimumFontSize = 17
     textField.adjustsFontSizeToFitWidth = true

     return textField
    }()

可以根据设备屏幕大小更改UITextField高度（仅高度）。我需要根据UITextField hight自动更改字体大小。怎么做？

Answer 1

label.minimumScaleFactor = 0.1    // your value
label.adjustsFontSizeToFitWidth = true    
label.lineBreakMode = .byClipping
label.numberOfLines = 0