Swift 設置導航背景圖片，

Question

class z_main:UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let mainColor = UIColor(red: 0, green: 160/255, blue: 1, alpha: 1)
        self.navigationController?.navigationBar.backgroundColor = mainColor
        self.navigationController?.navigationBar.tintColor = UIColor.whiteColor()
        self.title = "baosight"
        self.reloadInputViews()



    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }  
}

我是初學者，我希望代碼足以理解。

Answer 1

對於 Swift 3：

UINavigationBar.appearance().setBackgroundImage(UIImage(named: "image")!.resizableImage(withCapInsets: UIEdgeInsetsMake(0, 0, 0, 0), resizingMode: .stretch), for: .default)

Answer 2

[UINavigationBar .appearance().setBackgroundImage(UIImage(named: "img_bg"), forBarMetrics:.Default)];

Answer 3

self.navigationController?.navigationBar.setBackgroundImage(UIImage(named: "some_name"), 
                                               forBarMetrics: .Default)