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。我想在代码不是IB，所以我可以随后更改图像。

在阅读了关于.ScaleAspectFill的所有提示后，我的图片仍然无法调整以适应屏幕。任何人都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

创建的形象图，该图像添加到图像视图和图像视图添加到您的视图层次。

override viewDidLoad() { 
    super.viewDidLoad() 

    let imageView = UIImageView(frame: self.view.bounds) 
    imageView.image = UIImage(named: "your image name")//if its in images.xcassets 
    self.view.addSubview(imageView) 
} 

Answer 2

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 

}