以编程方式在UINavigationController中设置UINavigationBar的自定义子类

import UIKit

class CustomNavigationBar: UINavigationBar {
    // 在这里添加自定义属性和方法
}

import UIKit

class CustomNavigationController: UINavigationController {
    override class func navigationBarClass() -> AnyClass {
        return CustomNavigationBar.self
    }
}

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        let navigationController = CustomNavigationController(rootViewController: ViewController())
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = navigationController
        window?.makeKeyAndVisible()
        return true
    }
}