从AppDelegate启动ViewController

Question

我有一个自定义URL方案，我想打开一个特定的ViewController ，当我转到这个URL时，它不是根。 我已经能够做到这一点，剩下的就是从AppDelegate将这个ViewController推送到navigationController ，我在这里处理我的URL：

- (BOOL)application:(UIApplication *)application
     openURL:(NSURL *)url
     sourceApplication:(NSString *)sourceApplication
     annotation:(id)annotation {

if ([[url scheme] isEqualToString:@"njoftime"]) {

    NSDictionary *getListingResponse = [[NSDictionary alloc]init];
    getListingResponse = [Utils getListing:[url query]];;

    if ([[getListingResponse objectForKey:@"status"] isEqualToString:@"success"]) {
         ListingViewController *listingView = [[ListingViewController alloc]init];
         [self.window.rootViewController.navigationController pushViewController:listingView animated:YES];
         return YES;
    }

但它只启动我的应用程序，而不是我想要启动的ListingViewController 。 知道我怎么能以不同的方式做到这一点？

Answer 1

问题

要处理从AppDelegate推送和弹出viewControllers，您需要使用[UIApplication sharedApplication]跟踪所有viewControllers，从root 1开始。

---

解

从AppDelegate 推送 ViewController

ListingViewController *listingVC = [[ListingViewController alloc] init];
[(UINavigationController *)self.window.rootViewController pushViewController:listingVC animated:YES];

弹出您刚才介绍的是视图控制器，你需要使用这个代码

[(UINavigationController *)[UIApplication sharedApplication].keyWindow.rootViewController popViewControllerAnimated:YES ];

---

Answer 2

如果您使用故事板，那么您可以使用以下行来推送您的VC。

 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
 YOURCLASS *obj=[storyboard instantiateViewControllerWithIdentifier:@"YOUR_CLASS_STORYBOARD_ID"];
[self.window.rootViewController.navigationController pushViewController:obj animated:YES];

更新： -

ListingViewController *listingVC = [[ListingViewController alloc] init];
UINavigationController *navCon = [[UINavigationController alloc] initWithRootViewController:listingVC];
[self.window.rootViewController presentViewController:navCon animated:YES completion:nil];

Answer 3

在didFinishingWithLaunchingOptions中编写此代码

  SecViewController *Vc = [[UIStoryboard storyboardWithName:@"Main" bundle:nil]instantiateViewControllerWithIdentifier:@"second"];
   [(UINavigationController *)self.window.rootViewController pushViewController:Vc animated:YES];

Answer 4

对于Swift 3版本：

let mainStoryboardIpad : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewControlleripad : UINavigationController = mainStoryboardIpad.instantiateViewController(withIdentifier: "initial") as! UINavigationController
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = initialViewControlleripad
self.window?.makeKeyAndVisible()

Answer 5

如果你想推送一个UIViewController，你可能忘记用NibName初始化它：

LoginViewController *loginViewController = [[LoginViewController alloc]initWithNibName:@"LoginViewController" bundle:nil];

Answer 6

您的AppDelegate.m应如下所示：

#import "TestViewController.h"

@interface AppDelegate ()

@property (strong, nonatomic) TestViewController *viewController;

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
  self.viewController = [[TestViewController alloc]init];
  self.window.rootViewController = self.viewController;
  [self.window makeKeyAndVisible];

  return YES;
}