I am new to IOS,
I would like to add a UINavigationBar to UITableViewController, I have tried this:
var navBar: UINavigationBar = UINavigationBar(frame: CGRect(x:0, y:0, width:320, height:80))
then,
self.view .addSubview(navBar)
Thanks
You can not simplly add a NavigationBar to UITableViewController like that. 
The simplest way to have UINavigationController and NavigationBar is to do it from Storyboard.
Steps:-
Drag the UITableViewController Object from Object Library to the Storyboard.
Highlight the UITableViewController, go to Edit -> Embed In -> Navigation Controller like the screen shot below:-

Go to File -> New -> File.. -> iOS -> Cocoa Touch Class, and create a Custom TableViewController class like below screen shot:-

You may do whatever you want with the custom class file. You may also add a custom UINavigationController class as well if you want and you may attach the custom class to to the object inside the storyboard. 
If this is merely the case of showing a modal UITableViewController with a navigation bar, the easiest way to do this from code is to present a UINavigationController with your UITableViewController as the rootViewController:
Presenting view controller:
let sourceSelectorTableViewController = SourceSelectorTableViewController()
let navigationController = UINavigationController(rootViewController: sourceSelectorTableViewController)
self.presentViewController(navigationController, animated: true, completion: nil)
Destination modal UITableViewController:
override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Plain, target: self, action: "cancel")
    self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Done, target: self, action: "done")
    self.title = "Pick a Source"
}
func cancel() {
    self.dismissViewControllerAnimated(true, completion: nil)
}
func done() {
    //save things
    self.dismissViewControllerAnimated(true, completion: nil)
}
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