你可以子类化UIButton并给它添加@IBInspectable变量，这样你就可以通过StoryBoard的“Attribute Inspector”配置自定义按钮参数。下面我写下代码。

@IBDesignable
class BHButton: UIButton {

    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */

    @IBInspectable lazy var isRoundRectButton : Bool = false

    @IBInspectable public var cornerRadius : CGFloat = 0.0 {
        didSet{
            setUpView()
        }
    }

    @IBInspectable public var borderColor : UIColor = UIColor.clear {
        didSet {
            self.layer.borderColor = borderColor.cgColor
        }
    }

    @IBInspectable public var borderWidth : CGFloat = 0.0 {
        didSet {
            self.layer.borderWidth = borderWidth
        }
    }

    //  MARK:   Awake From Nib

    override func awakeFromNib() {
        super.awakeFromNib()
        setUpView()
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        setUpView()
    }

    func setUpView() {
        if isRoundRectButton {
            self.layer.cornerRadius = self.bounds.height/2;
            self.clipsToBounds = true
        }
        else{
            self.layer.cornerRadius = self.cornerRadius;
            self.clipsToBounds = true
        }
    }

}

import UIKit

@IBDesignable
class RoundedButton: UIButton {
    
    @IBInspectable var cornerRadius: CGFloat = 8
    @IBInspectable var borderColor: UIColor? = .lightGray
    
    override func draw(_ rect: CGRect) {
        layer.cornerRadius = cornerRadius
        layer.masksToBounds = true
        layer.borderWidth = 1
        layer.borderColor = borderColor?.cgColor
        
    }
    
    
}

使用button.layer。cornerRadius, button.layer.borderColor和button.layer.borderWidth。 注意borderColor需要CGColor，所以你可以说(Swift 3/4):

button.backgroundColor = .clear
button.layer.cornerRadius = 5
button.layer.borderWidth = 1
button.layer.borderColor = UIColor.black.cgColor

作为另一个提示，确保你的按钮不是任何自定义类的子类在故事板，在这种情况下，你的代码最好的地方应该在自定义类它自己的原因代码只出自定义类，如果你的按钮是默认UIButton类的子类和它的出口，希望这可能有助于任何人想知道为什么角收音机不适用于我的按钮从代码。

你可以使用UIButton的子类来根据你的需要定制UIButton。

访问这个github回购参考

class RoundedRectButton: UIButton {

    var selectedState: Bool = false

    override func awakeFromNib() {
        super.awakeFromNib()
        layer.borderWidth = 2 / UIScreen.main.nativeScale
        layer.borderColor = UIColor.white.cgColor
        contentEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
    }


    override func layoutSubviews(){
        super.layoutSubviews()
        layer.cornerRadius = frame.height / 2
        backgroundColor = selectedState ? UIColor.white : UIColor.clear
        self.titleLabel?.textColor = selectedState ? UIColor.green : UIColor.white
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        selectedState = !selectedState
        self.layoutSubviews()
    }
}

它是UIButton圆角边框的全局方法

class func setRoundedBorderButton(btn:UIButton)
{
   btn.layer.cornerRadius = btn.frame.size.height/2
   btn.layer.borderWidth = 0.5
   btn.layer.borderColor = UIColor.darkGray.cgColor
}