swift UISwitch

 onswitch = UISwitch()
        view.addSubview(onswitch)
//        Apple官方说明，对UISwitch设置大小是无效的，其永远保持在(51,31)的大小
        onswitch.mas_makeConstraints { (make) in
            make?.left.equalTo()(view.mas_left)?.offset()(RESIZE(size: 100))
            make?.top.equalTo()(nameTextFiled.mas_bottom)?.offset()(RESIZE(size: 40))
            make?.width.mas_equalTo()(RESIZE(size: 100));
            make?.height.mas_equalTo()(RESIZE(size: 40))
        }
//        onswitch.isOn = false
        onswitch.transform = CGAffineTransform(scaleX: 0.75, y: 0.75);//可以使用transform修改switch的大小
        onswitch.setOn(true, animated: true)
        onswitch.thumbTintColor = UIColor.red//滑块上小圆点的颜色
        onswitch.onTintColor = UIColor.green//设置开启状态显示的颜色
        onswitch.tintColor = UIColor.black//设置关闭状态的颜色
        onswitch.onImage = UIImage(named: "1")
        onswitch.offImage = UIImage(named: "2")
        
        onswitch.addTarget(self, action: #selector(switchClick), for: .valueChanged)

实现点击方法

@objc func switchClick(){
        print(onswitch.isOn)
    }