Changing Background on orientation change fails - ios

Question

I have two images bg-land and bg-port for different orientation. I wanna change the image on chnaging orientation. But, the image does not change. When I load the Simulator in LandScape, bg-land works perfect but does not work with Rotation. Code:
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

This code works fine for me try this:
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()
}
Don't forget to change image name from this code.
May be this will help you.

Answer 2

It's not changing because you are sending the newly added UIImageView to the back of your previously created UIImageView. Instead of doing that, create a member variable in your class for UIImageView. (Name it as 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
}
}
But it is better to add a UIImageView outlet to your interface and loading the image using code, rather than creating one at run-time. And I prefer that would be a nice approach.