swift UItextfield输入内容超出设定宽度不自动换行

问题遇到的现象和发生背景

在自定义的Alert上面添加了如下输入框，设置了高度为60

问题相关代码，请勿粘贴截图

    // descriptionField
    var descriptionField: UITextField = {
        let textField = UITextField(frame: .zero)
        let typeAttributes: [NSAttributedString.Key : Any] = [
            .foregroundColor : UIColor.white,
            .font : Theme.Font.PingFangMedium(15.0)
        ]
        textField.defaultTextAttributes = typeAttributes
        textField.typingAttributes = typeAttributes
        textField.keyboardType = .default
        textField.keyboardAppearance = .dark
        textField.returnKeyType = .done
        textField.textAlignment = .left
        textField.contentVerticalAlignment = .top
        let str = NSAttributedString(string: "描述",
                                     attributes: [
                                        NSAttributedString.Key.font: Theme.Font.PingFangMedium(15.0),
                                        NSAttributedString.Key.foregroundColor:"#707070".hexColor])
        textField.attributedPlaceholder = str
        return textField
    }()


descriptionField.snp.makeConstraints { make in
            make.left.equalTo(descriptionBgView.snp.left).offset(19.75)
            make.top.equalTo(descriptionBgView.snp.top).offset(9.42)
            make.width.equalTo(Theme.Size.width - 60.0)
            make.height.equalTo(60.0)
        }
descriptionBgView.addSubview(descriptionField)

运行结果及报错内容

当输入内容超出预定宽度时，输入内容仍然继续向后。检查发现_UITextLayoutFragmentView的高度只有一行文字高度。UITextField,UIFieldEditor,_UITextLayoutCanvasView的高度均为60

我想要达到的结果

UITextField的高度为60，宽度为屏幕宽度-60.输入内容超出设定宽度后，自动换行输入