Xcode 7.3.1 : Set background image to UINavigationBar and display back button - ios

Question

I want to set logo of app as background image to UINavigationBar and when user traverse into app it should display logo as well as back button on top of it.
Below is code that I've used :
func setNavigationBar() {
let navigationBarHeight: CGFloat = self.navigationController!.navigationBar.frame.height
let screenSize: CGRect = UIScreen.mainScreen().bounds
let objCustomView = CustomView(frame: CGRect(x: 0, y: 0, width: screenSize.width, height: navigationBarHeight))
let objWindow = UIApplication.sharedApplication().keyWindow
objWindow?.addSubview(objCustomView)
self.navigationItem.setHidesBackButton(false, animated:true);
self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"", style:.Plain, target:nil, action:nil)
}
The issue with this is that back button goes behind the image.
How to fix this?
After refering post by #NDoc I'm getting extra space in left. Why so?
Also, the back button should be white with no back text i.e. only < arrow.
Below is code for customView :
class CustomView: UIView {
var imgLogo = UIImageView(frame:CGRectZero)
override init(frame: CGRect) {
super.init(frame: frame)
let screenSize: CGRect = UIScreen.mainScreen().bounds
imgLogo.frame = CGRectMake(0, 0, screenSize.width, 44.0)
setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
func setup() {
imgLogo.image = UIImage(named:"BoM_Logo")
self.addSubview(imgLogo)
}
}

Answer 1

You can display your logo in leftBarButtonItem and set the leftItemsSupplementBackButton to true to display backButton also like this.
let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let item = UIBarButtonItem(customView: logoView)
self.navigationItem.leftBarButtonItem = item
To show the back button with your logo image set leftItemsSupplementBackButton to true
self.navigationItem.leftItemsSupplementBackButton = true
Edit:
If you want custom arrow then you need to use leftBarButtonItems and pass array of BarButtonItem and no need to set leftItemsSupplementBackButton to true like this.
let logoView = UIImageView(frame: CGRect(x: 0, y: 0, width: 60, height: 30))
logoView.image = UIImage(named: "Logo")
let logoItem = UIBarButtonItem(customView: logoView)
let btnBack = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
btnBack.setImage(UIImage(named: "Back_Arrow"), forState: .Normal)
btnBack.addTarget(self, action: #selector(self.buttonAction(_:)), forControlEvents: .TouchUpInside)
let backItem = UIBarButtonItem(customView: btnBack)
self.navigationItem.leftBarButtonItems = [backItem, logoItem]
Note: Don't forgot to add buttonAction action method inside your viewController.

Answer 2

Try this in your appDelegate
let image = UIImage.init(named:"upper-bar.png")
UINavigationBar.appearance().setBackgroundImage(image,forBarMetrics:UIBarMetrics.Default)
for back button try this in the viewDidLoad() of your viewController
let image1 = UIImage(named: "go10.png") as UIImage?
let btnLeft = UIButton(type: .Custom)
btnLeft.frame = CGRectMake(0, 0, 25, 25)
btnLeft.setImage(image1,forState:UIControlState.Normal)
btnLeft.addTarget(self, action:(#selector(NameofyourViewController.backBtn(_:))),forControlEvents:UIControlEvents.TouchUpInside)
let leftBarButton = UIBarButtonItem(customView: btnLeft)
self.navigationItem.leftBarButtonItem = leftBarButton
#IBAction func backBtn(sender: UIButton)
{
self.navigationController?.popViewControllerAnimated(true)
}