xcode加载视图及图片并给视图加个边框swift代码

import UIKit

import Foundation

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        let image = UIImage(named: "timg")

        let imageView = UIImageView(image: image)

        imageView.frame = CGRect(x: 0, y: 0, width: 300, height: 500)

        imageView.layer.borderWidth = 8;

        imageView.layer.borderColor = UIColor.lightGray.cgColor

        self.view.addSubview(imageView)

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}