Swift: UINavigationBar Customized

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func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    // cache the bar
    var nav = self.navigationController?.navigationBar
    
    // Change the background color of the bar
    nav?.barTintColor = UIColor.blueColor()

    // Change the NavigationBar's back button color
    nav?.tintColor = UIColor.redColor()

    // Is the bar translucent
    nav?.translucent = true

    // Create an imageView to place instead of the NavigationBar title
    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
    imageView.contentMode = .ScaleAspectFit

    // Put an image inside the imageView
    let image = UIImage(named: "MyImage")
    imageView.image = image

    // place it instead of the title
    self.navigationItem.titleView = imageView
}