uinavigationcontroller

问题 I am trying to build a storyboard in Xcode 7.x with more than 4 consequtive view controllers embedded in a UINavigationController. The navigation controller is the initial view controller. Embedded is a simple view controller only containing a single button, which is connected to an Adaptive Show Segue, calling a similar view controller and so on. Each one calling the next by a simple Show Segue. The Push only works for 3 consecutive calls, thereafter the reference to the navigation

问题 I see many applications that display onboarding view controllers before allowing access to the main content. I have noticed that a lot of the onboarding tutorials initially display the onboarding content and then dismiss that view controller to allow access to the content. I know that Xcode gives warnings when you try to present a view controller on a view that is not visible, such as in viewDidLoad and viewWillAppear: . So instantiating the content's view controller inside of a navigation

问题 What is the proper method to determine whether the root view (top level) controller of a navigation stack is appearing as a result of being initially presented vs. being uncovered? The iOS documentation suggests using isMovingToParentViewController inside viewWill/DidAppear: to make that determination. This works for view controllers pushed on the stack, but appears to always return FALSE for the stack root view controller. Thanks for helping. 回答1: Looks like someone else has answered the

问题 I seem to have forgotten how to change the root view for a UINavigationController I have this code: [window addSubview:navController.view]; but where do i set (preferably through interface builder) the root view please? 回答1: UINavigationController has a viewControllers property, which is a NSArray and is not read-only, so it can be replaced. From Apple's UINavigationController reference Assigning a new array of view controllers to this property is equivalent to calling the setViewControllers

问题 I need to change the color of my navigation bar on only some specific views. There are many discussions about modifying the color of navigation bar, like https://stackoverflow.com/a/18870519/938380, but they all change the color of navigation bar on every views under the same navigation hierarchy. I want to change the color on specific views and keep other views the same color. How do I achieve this? 回答1: if you use standart navigation bar, you can't do it. But you can use some cheat ;) For

问题 I have an application which its rootview is a menu to 4 tableviews that the user uses to set up a search query by selecting a cell that loads another subview, so the basic structure looks like this Root View - Parent View (search view) --Sub View (user selects variables here to fill search parameters of the parent view But one of the Parent View search parameters requiers another sub view to be pushed onto the navigation stack so it would look like Root View - Parent View (search view) --Sub

问题 In our iOS application with three UIViewController s one after another, we would like to skip the middle one based on some condition and go directly from first to third. However, the user should be able to come back to the second one via the "Back" button on the third controller. I tried [self performSegueWithIdentifier:@"segueId" sender:sender]; from viewDidLoad , viewWillAppear but this corrupts the navigation bar as indicated by the debug log. Calling this code from viewDidAppear works

问题 I need to save my data by calling a method I already have when a viewController is popped using the back button created by the UINavigationController. Is there a way to get a delegate callback or a notification I didn't see anything in the documentation? 回答1: You will be notified that the view will be disappearing, with the view controller method viewWillDisappear:, however, this will be called each time the view is moved offscreen, whether that means the controller is popped or a new

问题 In my app I have three table view controllers and then potentially many UIViewControllers each of which has to lead back to the first table view controller if the user presses back at any point. I don't want the user to have to back through potentially hundreds of pages. This is what I amusing to determine if the user pressed the back button and it works the message is printed override func viewWillDisappear(_ animated: Bool) { if !movingForward { print("moving back") let startvc = self

问题 Im using a typical situation with UINavigationController, id like to make the navigation bar a bit taller. setting its bounds and frame dont seem to make a difference, im using this code //set up the navigation UINavigationController *navigationController = [UINavigationController new]; [navigationController.navigationBar setBarStyle:UIBarStyleBlack]; [navigationController.navigationBar setTintColor:[UIColor purpleColor]]; [navigationController.navigationBar setBounds:CGRectMake(0.0, 0.0, 480