以编程方式访问UISwitch大小而不添加组件

import UIKit

let mySwitch = UISwitch()

mySwitch.frame = CGRect(x: 50, y: 100, width: 100, height: 50)

self.view.addSubview(mySwitch)

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let mySwitch = UISwitch()
        mySwitch.frame = CGRect(x: 50, y: 100, width: 100, height: 50)
        self.view.addSubview(mySwitch)
    }
}