Question

简而言之： 如何从呈现的ViewController中推送PushController？

简介：

我有MainViewController，我点击按钮时只有一个按钮，我正在展示一个名为LoginViewController的视图。

在此页面上{LoginViewController），我再次点击button，点击它，我尝试推送我的视图控制器（名为HomeViewController），它不会推送

这是我的代码段，

MainViewController.m

- (IBAction)LoginClicked:(id)sender {
    LoginViewController *vc = [[LoginViewController alloc] init];
    [self presentViewController:vc animated:YES completion:nil];
}

LoginViewController.m

- (IBAction)buttonActionMethodOnLoginView:(id)sender{
     NSLog(@"viewControllers %@",APPDELEGATE.nav.viewControllers);
     //LoginViewController is not in this array
     HomeViewController *obj = [[HomeViewController alloc] init];
     [self.navigationController pushViewController:obj animated:YES];
}

但它对我不起作用。另外，我在a stack of view controllers之前打印了pushed，但它没有LoginViewController。因此，如果不将LoginViewController添加到a stack of view controllers，我如何从pushed HomeViewController LoginViewController HomeViewController添加LoginViewController？

当我从NavigationController获取后，NoneType' object has no attribute 'get' Request Method: GET Request URL: http://shootnscoreit.com/dashboard/ Django Version: 1.9.1 Exception Type: AttributeError Exception Value: 'NoneType' object has no attribute 'get' Exception Location: /usr/local/lib/python2.7/gettext.py in ugettext, line 400应该被打开..

是否可以使用此单usr/local/lib/python2.7/gettext.py in ugettext 400. tmsg = self._catalog.get(message, missing) Local Vars Variable Value message u'Armoury' self <DjangoTranslation lang:no> missing <object object at 0x7f0e72c00740>？

注意： - 这里，我刚刚使用Login，Home和Main ViewController进行了示例。但我希望将其纳入其他屏幕。

Answer 1

嗨，当您呈现您的登录视图控制器时只需出现一个navigationController，如：

LoginVC *loginVCObj =[[LoginVC alloc]initWithNibName:@"LoginVC" bundle:nil];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:loginVCObj];
[self presentViewController:nav animated:YES completion:nil];

现在您的PresentedViewController是一个navigtioncontroller 现在你可以简单地推送到你的家庭VC

  HomeViewController *obj = [[HomeViewController alloc] init];
 [self.navigationController pushViewController:obj animated:YES];

希望它对你有所帮助

Answer 2

LoginViewController不应该被推送到导航控制器堆栈。让我在下面描述“为什么”。

我们的MainViewController应该在堆栈中 - 你总是想回到那里。

// AppDelegate.m (only if you don't use storyboards, if you do - you don't need to copy this part of code)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // create the window
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [self.window setBackgroundColor:[UIColor whiteColor]];
    [self.window makeKeyAndVisible];

    // set view controllers
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:[[MainViewController alloc] init]];
    [self.window setRootViewController:navigationController];
}

具体操作显示LoginViewController。您不希望用户点按back并转到MainViewController。之后，您不希望用户返回LoginViewController。因此，您需要将其显示为模态：

// inside `MainViewController.m`
- (IBAction)myCoolActionToShowLogin:(id)sender {
    [self presentViewController:[[LoginViewController alloc] init] animated:YES completion:nil];
}

现在我们可以看到LoginViewController。用户完成登录后，将其关闭并显示HomeViewController：

// inside `LoginViewController.m`
- (IBAction)myAwesomeActionToShowHome:(id)sender {
    UINavigationController *navigationController = (UINavigationController *)[UIApplication.sharedApplication.keyWindow rootViewController];
    [navigationController pushViewController:[[HomeViewController alloc] init] animated:YES];
    [self dismissViewControllerAnimated:YES completion:nil];
}

注意：

您可能会注意到，myAwesomeActionToShowHome:希望您将导航控制器作为rootViewController。这是有效的，但应该更好 - 你应该检查导航是否实际上是导航控制器，而不是铸造它。或者您可以创建一个委托或块来推送新的委托或块。这是最快，最简单的工作解决方案，应该在以后进行改进。

你真的应该是：Apple Developer -> "View Controller Programming" documentation，因为这些是您应该了解的核心基础知识＆amp;正确设计UX。

这是工作demo sample。

Answer 3

您无法从呈现的视图控制器推送。我建议你应该维护你的导航层次结构。

为此，您应该从MainViewController中呈现LoginViewController，并且应该为MainViewController传递导航控制器。

- (IBAction)openLogin:(id)sender {
    LoginViewController *loginVC = (LoginViewController *) [self.storyboard instantiateViewControllerWithIdentifier:@"login"];
    [loginVC setReferencedNavigation:self.navigationController];
    [self presentViewController:loginVC animated:YES completion:nil];
}

然后在LoginViewController中，你应该像这样推送到HomeViewController，

LoginViewController.h

@interface LoginViewController : UIViewController {
    UINavigationController *refNavigationController;
}
- (void) setReferencedNavigation:(UINavigationController *)refNavCon;

LoginViewController.m

- (void) setReferencedNavigation:(UINavigationController *)refNavCon {
    refNavigationController = refNavCon;
}

- (IBAction)openHome:(id)sender {
    [self dismissViewControllerAnimated:YES completion:^{
        UIViewController *homeVC = [self.storyboard instantiateViewControllerWithIdentifier:@"home"];
        [refNavigationController pushViewController:homeVC animated:YES];
    }];
}

通过执行此操作，看起来，您正在从LoginViewController推送，但实际上您正在从MainViewController推送。

您可以自定义此方法以维护此流程的动画和UI。

Answer 4

1）将navigation controller with its根视图控制器设置为视图控制器。

- (IBAction)LoginClicked:(id)sender 
{
    LoginViewController *loginViewController = [LoginViewController alloc] init];
    UINavigationController *navController = [UINavigationController alloc] initWithRootViewController:loginViewController];
    [self presentViewController:navController animated:YES completion:nil];
}

- (IBAction)buttonActionMethodOnLoginView:(id)sender
{
    HomeViewController *obj = [[HomeViewController alloc] init];
    [self.navigationController pushViewController:obj animated:YES];
}

希望它对你有用。

Answer 5

问题是LoginViewController没有导航控制器。然后你给它一个。

MainViewController.m

创建UINavigationController，将LoginViewController放入堆栈并显示UINavigationController。

- (IBAction)LoginClicked:(id)sender {
    LoginViewController *vc = [[LoginViewController alloc] init];
    UINavigationController = nav = [[UINavigationController alloc] init];
    nav.viewControllers = @[vc];
    [self presentViewController:nav animated:YES completion:nil];
}

LoginViewController.m

- (IBAction)buttonActionMethodOnLoginView:(id)sender{
    HomeViewController *obj = [[HomeViewController alloc] init];
    [self.navigationController pushViewController:obj animated:YES];
}

关闭

在dismissViewControllerAnimated。

中致电MainViewController

Answer 6

创建UINavigationController实例

[[UINavigationController alloc] initWithRootViewController:[[LoginViewController alloc] init]]

展示导航控制器，然后推送你想要的任何VC。

Answer 7

<强> MainViewController.m

 - (IBAction)LoginClicked:(id)sender {

     LoginViewController *vc = [[LoginViewController alloc] init];

     UINavigationController *loginNav = [[UINavigationController alloc] initWithRootViewController:vc]; 

     [self presentViewController:loginNav animated:YES completion:nil];  

 }

<强> LoginViewController.m

- (IBAction)buttonActionMethodOnLoginView:(id)sender{
     NSLog(@"viewControllers %@",APPDELEGATE.nav.viewControllers);
     //LoginViewController is not in this array
     HomeViewController *obj = [[HomeViewController alloc] init];
     [self.navigationController pushViewController:obj animated:YES];
}

Answer 8

这是当前视图控制器和推送视图控制器的非常简单的代码。

- (IBAction)LoginClicked:(id)sender {
        LoginViewController *objLogicVC = [LoginViewController alloc] init];
        UINavigationController *navPresent = [UINavigationController alloc] initWithRootViewController:objLogicVC];
        [self presentViewController:navPresent animated:YES completion:nil];
}

- (IBAction)buttonActionMethodOnLoginView:(id)sender{
        HomeViewController *objHomeVC = [[HomeViewController alloc] init];
        [self.navigationController pushViewController:objHomeVC animated:YES];
}

Answer 9

只需将此代码放在按钮 操作按钮 目标c 中

UIViewController *yourViewControllerName = [self.storyboard instantiateViewControllerWithIdentifier:@"yourViewControllerName "];

[[self navigationController] pushViewController:yourViewControllerName  animated:YES];

Answer 10

您必须从第一个视图（Push）MainViewController开始，但您可以使用与PresentView和DismissView相同的动画。使用以下代码： -

推送（在MainViewController上）

LoginViewController *VC = [[LoginViewController alloc]init];
CATransition* transition = [CATransition animation];
transition.duration = 0.3f;
transition.type = kCATransitionMoveIn;
transition.subtype = kCATransitionFromTop;
[self.navigationController.view.layer addAnimation:transition
                                            forKey:kCATransition];
[[[UINavigationController alloc] initWithRootViewController:VC] pushViewController:VC animated:NO];
//[self.navigationController pushViewController:VC animated:NO];

适用于Pop （在LoginViewController上）

CATransition* transition = [CATransition animation];
transition.duration = 0.3f;
transition.type = kCATransitionReveal;
transition.subtype = kCATransitionFromBottom;
[self.navigationController.view.layer addAnimation:transition
                                            forKey:kCATransition];
[self.navigationController popViewControllerAnimated:NO];

使用此代码，您可以获得与Present-Dismiss ViewControllers相同的动画。有关详细信息，请参阅this answer。

之后，您可以将代码用于Pushing LoginViewController到HomeViewController

希望，这是你正在寻找的。任何关注都会回复给我。：）

Answer 11

对于Swift 3.0

将您的视图控制器显示为新的rootViewController

let navController = UINavigationController.init(rootViewController: self.storyboard!.instantiateViewController(withIdentifier: "SignInViewController"))
self.present(navController, animated: true, completion: {})

现在从显示的视图控制器推送视图控制器

self.show(self.storyboard!.instantiateViewController(withIdentifier: "SignUpViewController"), sender: self)

在iOS中从提供的视图控制器推送视图

11 个答案:

MainViewController.m

LoginViewController.m

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