试试这个 ：

import UIKit

class YourViewController : UIViewController {

    var navBar: UINavigationBar = UINavigationBar()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.setNavBarToTheView()
        // Do any additional setup after loading the view.
        self.title = "test test"
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func setNavBarToTheView() {
        self.navBar.frame = CGRectMake(0, 0, 320, 50)  // Here you can set you Width and Height for your navBar
        self.navBar.backgroundColor = (UIColor.blackColor())
        self.view.addSubview(navBar)
    }
}