uinavigationcontroller

问题 Is there a clean solution on getting a callback or event on the view controller being dismissed (popped) by an interactivePopGestureRecognizer ? To be clear I need some explicit method getting called on the top most controller (and no other) before the controller will be popped by this gesture recogniser. I do not want to get the event on the navigation controller and send the event to the appropriate controller and I do not want to use viewWillAppear or viewWillDissapear ... The closest

问题 I have a view based app that works well. (In other words, I'm not going to start over with a Navigation-Based App template.) It's an immersive app of sorts and I'm trying to add a Table View that loads in a new view when a button is pressed. The loading the nib part works, but I can't seem to be able to add a navigation controller to the new view. I want to see a navigation bar on top with a done button and an edit button. Also, I want to the Table View entries to be empty. I added a new file

问题 I have an hierarchy of 3 view controllers in my navigation bar controller: view1->view2->view3. After the user finished with view3 I want to take him to view1. What is the best approach to do that? thanks, Nava 回答1: Assuming that view3 and view2 have already been pushed onto your navigation controller, you can use -[UINavigationController popToRootViewControllerAnimated:] or -[UINavigationController popToViewController:animated:] to accomplish this. 回答2: Simply make the action of a

问题 I have an hierarchy of 3 view controllers in my navigation bar controller: view1->view2->view3. After the user finished with view3 I want to take him to view1. What is the best approach to do that? thanks, Nava 回答1: Assuming that view3 and view2 have already been pushed onto your navigation controller, you can use -[UINavigationController popToRootViewControllerAnimated:] or -[UINavigationController popToViewController:animated:] to accomplish this. 回答2: Simply make the action of a

问题 I am making an app that embeds a navigationcontroller into a tabbarcontroller. Now when I open the app I am getting just a blank black screen. Here is my code PDCFirstViewController *viewController1 = [[PDCFirstViewController alloc] initWithNibName:@"PDCFirstViewController" bundle:nil]; PDCSecondViewController *viewController2 = [[PDCSecondViewController alloc] initWithNibName:@"PDCSecondViewController" bundle:nil]; ViewController *viewController3 = [[ViewController alloc] initWithNibName:@

问题 I have a UINavigationController that needs to manage several view controllers. The navigation controller is in Take.m below, and each view controller in it's own file (see CamverViewController.m below). As a new XCode developer, I'm trying to figure out how to structure the application so events such as the tap of the button in the navigation bar can get access to the instance of the navigation controller to change the active view controller. I understand how to manipulate the view

问题 Coordinator pattern is an old topic with many libraries trying to solve it and I am learning it in simple example app. My current set up is 3 rootViewControlers: LoadingStateCoordinator , WelcomeCoordinator , TabBarCoordinator but missing connection between UIKit and coordinators. I am trying to implement it with a UINavigationController but the button is not being called. I need a way to connect to back button and a reusable coordinator that I could push to and dellocate accordingly (that is

问题 I am trying to include a navigation controller within the third tab of my tabbarcontroller. I have had some feedback but am only able to get about this far. The code below doesn't produce any errors, but does not seem to work as the app just quits out. Does anyone have any input on what I might be doing wrong? UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"PDCFirstViewController" bundle:nil]; UIViewController *viewController2 = [[SecondViewController alloc]

问题 I have a UIViewController which was created in a storyboard and has been assigned a storyboard id. This UIViewController is instantiated in various places in code and therefor it didn't make sense to create segues from all the different locations. The view controller needs to be contained in a UINavigationController in order to function properly because it uses the various navigation bar items and can push additional view controllers. The view controller is instantiated from code as follows:

问题 I want to show the terms and conditions only the first time of my app launch. Currently I am writing my code in didFinishLaunchingWithOptions . - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Handle launching from a notification if ([[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"]) { NSLog(@"Already Run"); } else { [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"]; [