Above is the storyboard for my chat app.
What you'r not seeing to the left before the Navigation Controller is a simple login view. The Storyboard Segue identifier to the Navigation Controller is mainViewC.
What i want to do is to take the user to the Conv View Controller when a push notification is pressed.
This is what i've got so far:
// AppDelegate.h
#property (strong, nonatomic) ConvViewController *convViewController;
// AppDelegate.m
self.window.rootViewController = self.convViewController;
This takes me to the correct view but the view is black. Im guessing this has something to do with the Navigiation Controller not being loaded correctly..
Any ideas?
What you'll need to do is access the view controller from the story board. First go to the VC you wish to bring users to and give it a Storyboard ID. Then in your app delegate you would write.
self.window.rootViewController = [[UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"identifier"];
Related
I added a Navigation Controller to my storyboard and it appears like so:
Now in the table view controller, I gave the TableViewController a storyboard id and class to a TableViewController Controller
When I run my app, I don't see the Navigation Bar at the top. This has been extremely frustrating and can't find a solution anywhere. PLEASE HELP
To get to the scene, someone clicks a button and this code runs and it goes to my Table View Controller:
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:#"Storyboard" bundle:nil];
LHFileBrowser *LHFileBrowser = [storyBoard instantiateViewControllerWithIdentifier:#"FileBrowser"];
[self.navigationController pushViewController:LHFileBrowser animated:YES];
[self presentViewController:LHFileBrowser animated:YES completion:nil];
The error is in your code.
If you want to (modally) present a view controller when the user presses a button, you need to present the navigation controller (which will contain the table view controller), not the table view controller itself.
Right now, you're presenting the view controller, which won't show it being embedded in a navigation controller.
Also, you're mixing up two different approaches, by trying to push a view controller onto a navigation controller stack, and also presenting the view controller.
Code Sample:
Here's what you apparently mean to do:
UIStoryboard *storyboard = self.storyboard;
UINavigationController *navigationController = [storyboard instantiateViewControllerWithIdentifier:#"MyNavigationControllerID"];
LHFileBrowser *rootViewController = [navigationController topViewController];
// Configure your LHFileBrowser view controller here.
rootViewController.someProperty = ...;
// Modally present the embedded view controller
[self presentViewController:navigationController animated:YES completion:nil];
If you want to change the presentation or transition style, you can set those details in your storyboard.
You didn't explain why you had to programmatically add buttons, but Storyboard segues would have instantiated and presented an embedded view controller for you, without you having to have done it in code.
The more you can do in Storyboard, the less code you have to maintain, support, and update, and the more likely your app will still work properly when a new SDK is released.
Update:
The better way to do this is to let Storyboard do it for you, by adding a segue from the button to the navigation controller that you want to present.
In my app I've three view controller embedded in a UITabBarController. The second view controller embed a table view controller. Now I've this bug: I go to the second view controller, then I press home button and the app goes in background. When the app is closed I receive a push notification, so when I open the app it shows me the second view controller with table view without any changes. How I can update the table view automatically? For now I'm using the UIRefreshControl, but I will do it automatically, how I can do that?
You can get your VC's instance from storyboard. First you have to set storyboard ID to your VC
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]];
YourViewController *vc = [storyBoard instantiateViewControllerWithIdentifier:#"YourViewControllerID"]; // here YourViewControllerID is storyboard Id of your VC.
There are two views in my application.
After launching the app I switch the view with button like this:
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Storyboard" bundle:[NSBundle mainBundle]];
UIViewController *view = [storyboard instantiateViewControllerWithIdentifier:#"view_a"];
[self presentViewController:view_a animated:NO completion:nil];
But whenever i switch the view the code above initialize the view.
I want to maintain previous status of the view.
How can I solve this problem?
instantiateViewControllerWithIdentifier: always returns a new instance of an UIViewController.
You need to keep a reference to a previous one if you don't want to create it over and over.
On an iPad this will present the second view modally, as dictated by the views modalTransitionStyle. So there you could get back to the original by calling dismissViewControllerAnimated:completion: on the new ViewController.
On the iPhone you can use a UINavigationController in your storyboard to push and then pop the secondViewController.
As long as you are using the storyboard, you can set up the transition there and the perform it using - performSegueWithIdentifier:sender: from your button. Or for that matter you can connect the segue directly to your button in which case the transition will be performed without additional code.
I am trying to push a new root controller to a navigation stack, but using a side reveal menu.
My app delegate has the following:
welcomeViewController = [[MyWelcomeViewController alloc] initWithNibName:#"MyWelcomeViewController" bundle:nil];
navController = [[UINavigationController alloc] initWithRootViewController:welcomeViewController];
navController.navigationBarHidden = YES;
// Then we setup the reveal side view controller with the root view controller as the navigation controller
self.revealSideViewController = [[PPRevealSideViewController alloc] initWithRootViewController:navController];
[self.revealSideViewController setDirectionsToShowBounce:PPRevealSideDirectionNone];
[self.revealSideViewController setPanInteractionsWhenClosed:PPRevealSideInteractionContentView | PPRevealSideInteractionNavigationBar];
// Then we make the window root view controller the reveal side view controller
self.window.rootViewController = self.revealSideViewController;
Once the welcome view controller is displayed, the user logs in. Once logged in the following process runs again from the App Delegate.
self.navController.navigationBarHidden = NO;
[self.navController setTitle:#"Home"];
[self.navController pushViewController:homeViewController animated:NO];
I then have a side view controller setup which is a table view with custom cells setup.
When a row is selected I need to push a new root controller onto the navigation controller. I try this by using the following in the table view for the cell selected.
MyAccountViewController *accountViewController = [[MyAccountViewController alloc] init];
[self.navigationController setViewControllers:[NSArray arrayWithObject:accountViewController] animated:NO];
Unfortunately this does not do anything. If I add the code to the App Delegate and then call the method from the table view controller then it works, however not from the .m file for the table view itself. Adding a log I can see the above is run, just does not do anything.
I am unsure if I need to do anything different on the above. For example, completely pop the views currently shown, then create the navigation controller and PPRevealSideViewController all over again. If I am supposed to, I am unsure how to pop all the current views to then push the new to the window, not from the AppDelegate.
The reason I do not want this in the App Delegate is because it is the incorrect way to approach this, and I would then need a separate method for each new root controller I would like to push from the menu, so the App Delegate would become very large.
Check UINavigationController.h:
#interface UIViewController (UINavigationControllerItem)
#property(nonatomic,readonly,retain) UINavigationController *navigationController; // If this view controller has been pushed onto a navigation controller, return it.
It means when you do myViewController.navigationController you will either get nil if myViewController is not pushed to any navController or the navController reference myViewController is pushed into.
As I understand your tableViewController is not pushed into the navController stack, that means you can't get the navController with tableViewController.navigationController. Instead you'll need to use anyViewControllerInTheStack.navigationController or if the navController is the rootViewController of your keyWindow, by
((UINavigationController*)[[UIApplication sharedApplication] keyWindow].rootViewController)
Add something like this to your AppDelegate.h:
#define XAppDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])
Now you can access any iVar of AppDelegate from any .m file in your project.
MyAccountViewController *accountViewController = [[MyAccountViewController alloc] init];
[XAppDelegate.navController pushViewController:accountViewController animated:NO];
Make sure you add the correct imports.
One more thing: It's good to pop the login window from your navcontroller once you are done Logging in.
Hope this helps.
I am working on an app that at launch checks for valid login credentials, and if they are found and not expired the main split view controller is displayed, and if not a login screen should be displayed.
Each part is working fine separately, but I am struggling with the best way at launch time to select the proper view to display.
I have tried setting up a modal segue from the root view controller, and in my application:didFinishLaunchingWithOptions: function in the App Delegate, calling this:
// Segue to the login view controller...
if (loginNeeded) {
[self.window.rootViewController performSegueWithIdentifier:#"LoginScreen" sender:self];
}
This logically should work, but triggering segues from within the app delegate seems to be impossible.
What is the ideal place and technique for handling this?
You could try a custom segue, as per this post hiding-a-segue-on-login-process.
Alternatively if you're desperate to have the login display before the split view controller loads try something along the following lines...
Create your login screen on the main storyboard as, say, a subclass of UIViewController. Make sure it is the initial scene (check Is Initial View Controller).
On the storyboard, create a new segue from your login class to the original SplitViewController. Give it an identifier, 'Load SplitViewController' and a segue custom class name which we'll call FullyReplaceSegue.
In your login class .m file, add code to be called once the user has logged in:
[self performSegueWithIdentifier:#"Load SplitViewController" sender:self];
Create the new segue class, based on UIStoryboardSegue and name it FullyReplaceSegue as per above.
.h file
#import <UIKit/UIKit.h>
#interface : UIStoryboardSegue
#end
.m file
#import "FullyReplaceSegue.h"
#implementation FullyReplaceSegue
- (void)perform
{
UIViewController *dest = (UIViewController *) super.destinationViewController;
UIWindow *window = [UIApplication sharedApplication].keyWindow;
window.rootViewController = dest;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
UISplitViewController *splitViewController = (UISplitViewController *)dest; // assumes we're transitioning to a UISplitViewController!
UINavigationController *navigationController = [splitViewController.viewControllers lastObject];
splitViewController.delegate = (id)navigationController.topViewController;
}
}
#end
Here's how I did it.
In didFinishLaunchingWithOptions:
//save the root view controller
[[self window] makeKeyAndVisible];
UINavigationController *navigationController = (UINavigationController*) self.window.rootViewController;
rootController = [[navigationController viewControllers] objectAtIndex:0];
Somewhere else in the app delegate:
[rootController performSegueWithIdentifier:#"fileSegueID" sender:self];
Then, in the storyboard, create a segue from the view that gets assigned as "rootController", to the desired optional view, and give that new segue the id fileSegueID. It takes some debugging to make sure the rootController variable gets assigned to the correct view.
Maybe a little late, but I was looking for the same suggestions. Here's what I wound up doing.
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Signup" bundle:nil];
if(isLoggedIn) {
UINavigationController *navigationController = (UINavigationController*) self.window.rootViewController;
IndexController *ivc = [storyboard instantiateViewControllerWithIdentifier:#"IndexController"];
[navigationController pushViewController:ivc animated:NO];
}
Why don't you load the screen that would be visible assuming proper and non-expired log-in credentials (by setting it as the root view controller of the window), and then in viewDidLoad of that first view controller, check if an update to the login credentials are needed. If so, segue into the login view controller.
Yes, it can be used, if you get a reference to the segue's parent view controller. You can get it like this:
UINavigationController *navigationController = (UINavigationController*) self.window.rootViewController;
[[[navigationController viewControllers] objectAtIndex:0] performSegueWithIdentifier:#"LoginScreen" sender:self];
This will only work if the index in viewControllers array matches the one of your view controller and if it exists of course. In this case is the first one (in the array and storyboard).
The segue ("LoginScreen") must not be attached to an action. The way you do this is by control-dragging from the file owner icon at the bottom of the storyboard scene to the destination scene. A popup will appear that will ask for an option in “Manual Segue”; pick “Push” as the type. Tap on the little square and make sure you’re in the Attributes Inspector. Give it an identifier which you will use to refer to it in code.