ボタンの生成

// テキストボタン
modeButton = makeButton(CGRect(x: 0,y: 0,width: 150,height: 50), title: “ABCDE”, size: 21, tag: 0)
modeButton.layer.position = CGPoint(x:95, y:75)
self.view.addSubview(modeButton)

func makeButton(_ frame: CGRect, title: String, size:CGFloat, tag: Int) -> UIButton {
        let button = UIButton()
        button.frame = frame
        button.backgroundColor = UIColor.blue
        button.tag = tag
        button.layer.masksToBounds = true
        button.layer.cornerRadius = 5.0
        button.setTitle(title, for: UIControl.State())
        button.titleLabel?.font = UIFont.systemFont(ofSize: size)
        button.addTarget(self, action: #selector(self.onClick(_:)),for: UIControl.Event.touchUpInside)
        return button
}

// イメージボタン
editButton = makeImageButton(CGRect(x: 0,y: 0,width: 50,height: 50), imageName: “editIcon.png”, tag: 1)   editButton.layer.position = CGPoint(x:35, y:35)
self.view.addSubview(editButton)

func makeImageButton(_ frame: CGRect, imageName: String, tag: Int) -> UIButton {
        let button = UIButton(type: UIButton.ButtonType.system)
        button.frame = frame
        button.setBackgroundImage(UIImage(named: imageName), for: UIControl.State())
        button.tag = tag
        button.addTarget(self, action: #selector(self.onClick(_:)),for: UIControl.Event.touchUpInside)
        return button
}

@objc func onClick(_ sender: UIButton) {
        // code
}