[英]ViewController appears mulitple times when creating a navigationController programmatically in swift
[英]Creating a navigationController programmatically (Swift)
我一直在尝试以编程方式重做我的应用程序的工作。 (不使用情节提要)
我几乎完成了,除了手动导航 controller。
我一直在做一些研究,但我找不到任何手动实现它的文档。 (我开始将应用程序制作为单一视图应用程序)
目前,我只有 1 个视图控制器。 当然还有 appDelegate
导航 Controller 将在应用程序的所有页面中使用。
如果有人可以帮助我,或者发送指向一些适当文档的链接以编程方式执行此操作,将不胜感激。
编辑:
我忘了提到它在 Swift 中。
斯威夫特 1、2:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
var nav1 = UINavigationController()
var mainView = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
nav1.viewControllers = [mainView]
self.window!.rootViewController = nav1
self.window?.makeKeyAndVisible()
}
Swift 4+:和 Swift 5+
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let nav1 = UINavigationController()
let mainView = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
nav1.viewControllers = [mainView]
self.window!.rootViewController = nav1
self.window?.makeKeyAndVisible()
}
我建议用这个骨架启动你的 AppDelegate:
1) 尽可能使用let !
2) UINavigationController 具有rootViewController属性。
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let viewController = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
let navigationController = UINavigationController(rootViewController: viewController)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
对于那些使用 SceneDelegate.swift 构建新项目的人,您可以使用“var window: UIWindow?” 在 SceneDelegate 中而不是在 AppDelegate 中删除的“var window”
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
window?.windowScene = windowScene
window?.makeKeyAndVisible()
let viewController = ViewController()
let navViewController = UINavigationController(rootViewController: viewController)
window?.rootViewController = navViewController
}
试试这个。 它将指导您如何使用导航控制器。
在 iOS 中以编程方式创建 UINavigationController
AppDelegate.h
#import <UIKit/UIKit.h>
#import "LoginViewController.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong,nonatomic) UINavigationController *navigationController;
@property (strong,nonatomic) LoginViewController *loginVC;
@end
AppDelegate.m
#import "AppDelegate.h"
#import "LoginViewController.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.loginVC = [[LoginViewController alloc]initWithNibName:nil bundle:nil];
self.loginVC.title = @"Login Page";
self.navigationController = [[UINavigationController alloc]initWithRootViewController:self.loginVC];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
}
然后当你想推送另一个视图控制器时,简单地使用以下代码移动到另一个视图控制器。
- (IBAction)pushMyProfileView:(id)sender
{
self.myProfileVC = [[MyProfileViewController alloc]initWithNibName:nil bundle:nil];
[appDelegate.navigationController pushViewController:self.myProfileVC animated:YES];
}
这是 SceneDelegate 类的另一个例子:
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
let navController = UINavigationController()
let viewController = ViewController()
navController.viewControllers = [viewController]
window.rootViewController = navController
self.window = window
window.makeKeyAndVisible()
}
}
这可能是矫枉过正,但我发现自己经常这样做,以至于我只是扩展了 UIViewController 并创建了一个 embedInNavigationController 方法。 所以现在我可以调用 viewController.embedInNavigationController。
extension UIViewController {
func embedInNavigationController() -> UINavigationController {
return UINavigationController(rootViewController: self)
}
}
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let storyboard_Secondary = UIStoryboard(name: "Secondary", bundle: nil)
var initialViewController = UIViewController()
let aUser = CommonMethods.loadCustomObject("\(Constants.kUserProfile)") as? User
if aUser?.respCode == 1 {
initialViewController = storyboard_Secondary.instantiateViewController(withIdentifier: "MainTabVC")
UIApplication.shared.statusBarStyle = .lightContent
let navigationController = UINavigationController(rootViewController: initialViewController)
navigationController.isNavigationBarHidden = true
self.window!.rootViewController = navigationController
self.window!.makeKeyAndVisible()
}
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