Add fake navigation bar, remove, revert, load, unload and change status tint color, fake navigation bar can be used to assist transition from a controller with navigation background to one without.

FakeNavigationBar.swift

extension UIViewController {
    
    // Nav tag id
    private var fakeNavTag: Int{get{return 80327}}
    
    // Remove bar bar color and add fake nav bar
    public func loadFakeNavigationBar(){
        removeNavigationBarBackground()
        addFakeNavigationBar()
    }
    
    // Add back real nav bar
    public func loadRealNavigationBar(){
        if let navBar = self.view.viewWithTag(fakeNavTag){
            navBar.hidden = true
        }
        revertNavigationBarBackground()
    }
    
    // Add a fake nav bar on top
    public func addFakeNavigationBar(){
        if let navBar = self.view.viewWithTag(fakeNavTag){
            navBar.hidden = false
            navBar.frame = CGRectMake(0, 0, self.view.bounds.width, 64)
        }else{
            let fakeNavBar = UINavigationBar(frame: CGRectMake(0, 0, self.view.bounds.width, 64))
            fakeNavBar.tag = fakeNavTag
            view.addSubview(fakeNavBar)
        }
    }
    
    public func addFakeNavigationBarBehide(){
        if let navBar = self.view.viewWithTag(fakeNavTag){
            navBar.hidden = false
            navBar.frame = CGRectMake(0, -64, self.view.bounds.width, 64)
        }else{
            let fakeNavBar = UINavigationBar(frame: CGRectMake(0, -64, self.view.bounds.width, 64))
            fakeNavBar.tag = fakeNavTag
            view.addSubview(fakeNavBar)
        }
    }
    
    // Convert to transparent nav bar background color
    public func removeNavigationBarBackground(){
        self.navigationController!.navigationBar.translucent = true
        self.navigationController!.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
        self.navigationController!.navigationBar.shadowImage = UIImage()
    }
    
    // Revert to old nav bar background color
    public func revertNavigationBarBackground(){
        self.navigationController!.navigationBar.translucent = false
        self.navigationController!.navigationBar.setBackgroundImage(nil, forBarMetrics: UIBarMetrics.Default)
        self.navigationController!.navigationBar.shadowImage = nil
    }
    
    public func setBlackStatusBar(){
        UIApplication.sharedApplication().setStatusBarStyle(.Default, animated: true)
    }
    
    public func setWhiteStatusBar(){
        UIApplication.sharedApplication().setStatusBarStyle(.LightContent, animated: true)
    }
    
    public func setBlackStatusNavBar() {
        UIApplication.sharedApplication().setStatusBarStyle(.Default, animated: true)
        navigationController!.navigationBar.tintColor = UIColor.blackColor()
    }
    
    public func setWhiteStatusNavBar() {
        UIApplication.sharedApplication().setStatusBarStyle(.LightContent, animated: true)
        navigationController!.navigationBar.tintColor = UIColor.whiteColor()
    }
    
}