如何设置UIViewController背景图像来填充屏幕

Question

我有一个UIViewController我想将背景设置为一个图像.我想在代码中执行此操作IB,因此我可以随后更改图像.

阅读了有关.ScaleAspectFill我的图像的所有提示仍然没有调整大小以适应屏幕.有人可以提供任何建议吗？我的代码是:

override func viewDidLoad() {
    super.viewDidLoad()

    // set the inital backgroundColor
    self.view.backgroundColor = UIColor(patternImage: gameBackgroundOne!)
    self.view.contentMode = UIViewContentMode.ScaleAspectFill //doesnt seem to do anything!
    self.view.clipsToBounds = true // is this needed?
    self.view.center = view.center // is this needed?
}

Answer 1

最好为此创建一个单独的UIImageView.

var imageView: UIImageView!

override func loadView() {
    super.loadView()

    // get the correct image out of your assets cataloge
    let image = UIImage(named: "yourImageInAssets")!

    // initialize the value of imageView with a CGRectZero, resize it later
    self.imageView = UIImageView(frame: CGRectZero)

    // set the appropriate contentMode and add the image to your imageView property
    self.imageView.contentMode = .ScaleAspectFill
    self.imageView.image = image

    // add the imageView to your view hierarchy
    self.view.addSubview(imageView)
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    //set the frame of your imageView here to automatically adopt screen size changes (e.g. by rotation or splitscreen)
    self.imageView.frame = self.view.bounds

}