为什么当我使用空视图控制器创建导航控制器时我会收到导航栏的奇怪行为?
这就是我创建导航控制器的方法。
init(
window: UIWindow,
keystore: Keystore,
navigationController: UINavigationController = UINavigationController()
) {
self.navigationController = navigationController
self.keystore = keystore
super.init()
window.rootViewController = navigationController
window.makeKeyAndVisible()
}
比我简单做:
func start() {
let x = UIViewController()
x.view.backgroundColor = UIColor.red
navigationController.setViewControllers([x], animated: true)
}
可能就是这种情况,因为您在应用程序启动后设置了NavigationController。
我建议在AppDelegate中设置NavigationController。
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
let firstViewController = UIViewController()
let navigationController = UINavigationController(rootViewController: firstViewController)
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
return true
}
}