更改方向更改背景

Question

对于不同的方向，我有两个图像bg-land和bg-port。我想改变chnaging方向上的图像。但是，图像不会改变。当我在LandScape中加载模拟器时，bg-land完美运行，但不适用于旋转。代码：

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

    func loadBackground(){ 

     if(UIApplication.sharedApplication().statusBarOrientation.isPortrait){ 
      var bgImage  = UIImage(named: "bg-port") 
      var background = UIImageView(frame: self.view.bounds); 
      background.image = bgImage 
      self.view.addSubview(background) 
      self.view.sendSubviewToBack(background) 
      println(bgImage) 
     } else { 
      var bgImage  = UIImage(named: "bg-land") 
      var background = UIImageView(frame: self.view.bounds); 
      background.image = bgImage 
      self.view.addSubview(background) 
      self.view.sendSubviewToBack(background) 
      println(bgImage) 
     } 


    } 

    override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) { 
     loadBackground() 
    } 

Answer 1

这并不会改变，因为您将新添加的UIImageView发送到您以前创建的UIImageView的背面。而不是这样做，请在您的课程中为UIImageView创建一个成员变量。 （将其命名为background）

func loadBackground() 
{ 
    if self.background == nil 
    { 
     self.background = UIImageView() 
     self.view.addSubview(self.background) 
     self.view.sendSubviewToBack(self.background) 
    } 

    if(UIApplication.sharedApplication().statusBarOrientation.isPortrait) 
    { 
     var bgImage   = UIImage(named: "bg-port") 
     self.background.frame = self.view.bounds; 
     self.background.image = bgImage 
    } 
    else 
    { 
     var bgImage   = UIImage(named: "bg-land") 
     self.background.frame = self.view.bounds; 
     background.image  = bgImage 
    } 
} 

但最好是一个UIImageView出口添加到您的界面和使用的代码，而不是创建一个在运行时加载图像。我更喜欢这将是一个不错的方法。

Answer 2

我试试这个此代码工作正常：

override func viewDidLoad() { 
    super.viewDidLoad() 
    self.loadBackground() 
} 
func loadBackground(){ 

    if(UIApplication.sharedApplication().statusBarOrientation.isPortrait){ 
     let imageName = "Texture.jpg" 
     let image = UIImage(named: imageName) 
     let imageView = UIImageView(image: image!) 

     imageView.frame = self.view.bounds 
     view.addSubview(imageView) 
    } else { 
     let imageName = "AppIcon.png" 
     let image = UIImage(named: imageName) 
     let imageView = UIImageView(image: image!) 

     imageView.frame = self.view.bounds 
     view.addSubview(imageView) 
    } 


} 
override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) { 
    loadBackground() 
} 

不要忘记从这个代码改变形象的名字。

可能这会帮助你。