今天要來講最後也是我覺得在開發上比較實用App設定。

1.當我們想設定我的的navagationBar的時候，都要在每個畫面設定背景顏色、等等一些瑣碎的東西，或是你要設定推到下一個VC，簡單說就是透過今天的教學可以讓妳的code看起來更簡潔。

所以，第一步我們要建立一個swift檔案

建立完成後檔名我是叫做BaseViewController，這時候記得import UIKit喔～
然後下面就是我自己的客製化navagationBar的code，可以參考一下～

    public func setNavigationBarStyle(){
        if #available(iOS 15.0, *) {
            let appearance = UINavigationBarAppearance()
            appearance.configureWithOpaqueBackground()
            appearance.backgroundColor = #colorLiteral(red: 0.7579411864, green: 0.05860135704, blue: 0.1392720342, alpha: 1)
            self.navigationController?.navigationBar.tintColor = #colorLiteral(red: 0.9953911901, green: 0.9881951213, blue: 1, alpha: 1)
            appearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor : #colorLiteral(red: 0.9953911901, green: 0.9881951213, blue: 1, alpha: 1)]
            self.navigationController?.navigationBar.standardAppearance = appearance
            self.navigationController?.navigationBar.scrollEdgeAppearance = self.navigationController?.navigationBar.standardAppearance
        } else {
            self.navigationController?.navigationBar.barTintColor = #colorLiteral(red: 0.7579411864, green: 0.05860135704, blue: 0.1392720342, alpha: 1)
            self.navigationController?.navigationBar.tintColor = #colorLiteral(red: 0.9953911901, green: 0.9881951213, blue: 1, alpha: 1)
            self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor : #colorLiteral(red: 0.9953911901, green: 0.9881951213, blue: 1, alpha: 1)]
        }

    }

if #available(iOS 15.0)，是因為iOS15之後navagationBar會有高度顯示異常問題，所以就把這段加進去～

其他的設定應該不難，看不懂的話就動動手指google一下就行了。

呼叫方法：
之前有提到class可以被繼承，所以把原本的UIViewController改成我們的BaseViewController，再去call裡面的func就可以了～

然後這裡是pushVC的func，也是比較簡單的寫法，可以參考一下

    public func pushViewController(vc: UIViewController, animated: Bool = true) {
        vc.hidesBottomBarWhenPushed = true

        if let navigationController = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController {
            navigationController.pushViewController(vc, animated: animated)
        }
    }

    public func pushViewController(inStack stack: [UIViewController], vc: UIViewController, animated: Bool = true) {
        var stack = stack
        vc.hidesBottomBarWhenPushed = true
        stack.append(vc)
        self.navigationController?.setViewControllers(stack, animated: animated)
        
        //        self.navigationController?.pushViewController(vc, animated: animated)
    }
    
    public func popViewController(_ animated: Bool = true) {
        self.navigationController?.popViewController(animated: animated)
    }
    
    public func popToRootViewController(_ animated: Bool = true) {
        self.navigationController?.popToRootViewController(animated: animated)
    }
    
    public func dismissViewController(_ animated: Bool = true, completion: (()-> Void)? = nil) {
        self.navigationController?.dismiss(animated: animated, completion: completion)
    }