ios - 如何让图像覆盖整个UIView？

Question

我有下面的代码，将图像放置在 View 上。问题是从 iPhone 传输到 iPad 时，创建固定的高度和宽度不起作用。我希望代码能够传输整个 Canvas ，而不是固定数量。

@IBOutlet weak var jj: draw!

override func viewDidLoad() {
    super.viewDidLoad()

    let image = UIImage(named: "se")
    let imageView = UIImageView(image: image!)
    imageView.frame = CGRect(x: 0, y: 0, width: 200, height: 300)
    jj.addSubview(imageView)
}

Answer 1

您可以轻松地使用自动布局来完成此任务。

      let backgroundImage : UIImageView = {
        let image = UIImageView(image: #imageLiteral(resourceName: "name-of-image"))
        image.translatesAutoresizingMaskIntoConstraints = false
        image.contentMode = .scaleToFill
        return image
    }()

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

    func setUpView(){
        view.addSubview(backgroundImage)
        NSLayoutConstraint.activate([
            backgroundImage.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
            backgroundImage.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
            backgroundImage.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
            backgroundImage.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor)
        ])
    }