In my application, i tried to use the function
[self.navigationCotroller presentModalViewController:nextVC animated:YES];
However, when it goes to the next view, the subview fulfill the whole screen(of course it did)
And the question is , how could i add the bar button which lead the view back?
i have tried to use
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:#"back" style:UIBarButtonItemStyleDone target:self action:#selector(Go)];
in function viewdidLoad, but it did not work, there's no bar or even button showed
UINavigationBar *bb = [[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 44)];
self.NVBar = bb;
[self.view addSubview:bb];
However, i have no idea how to add a barbutton to the new navigationBar ---NVBar
Would you like to give me a solution?
You will need to pop the new view controller in order for the navigation bar to be automatically included.
In the view controller your code from above is in,
//*** Hook up four buttons to these actions and play around with it for a
//*** better sense of what is going on.
//*** JSBViewController is the name of my test class
//*** You should use your ViewController class that you are currently coding so
//*** you can see the difference of pop/push versus present/dismiss inside of a
//*** navigation controller
-(IBAction)push:(id)sender
{
JSBViewController * viewController = [self.storyboard instantiateViewControllerWithIdentifier:NSStringFromClass([JSBViewController class])];
[self.navigationController pushViewController:viewController animated:YES];
}
-(IBAction)pop:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
-(IBAction)present:(id)sender
{
JSBViewController * viewController = [self.storyboard instantiateViewControllerWithIdentifier:NSStringFromClass([JSBViewController class])];
[self presentViewController:viewController animated:YES completion:nil];
}
-(IBAction)dismiss:(id)sender
{
[self dismissViewControllerAnimated:YES completion:nil];
}
For the behavior you are looking for, you will need to use the push method
[self.navigationController pushViewController:viewController animated:YES];
If you use [self.navigationController pushViewController:picker animated:YES]; to push your nextVC, then the Nav Bar should stay at the top. Then you can pop back with ` [self.navigationController popViewControllerAnimated:YES];
It's quite unconventional to use a nav bar to go back from a modal view.
`
Related
I have a class, DisplayOptViewController, which is a subclass of UICollectionViewController.
I want to display this CollectionViewController when the user clicks a button in the Navigation Bar on my current page. I am able to load the CollectionView on button Click but the Navigation Bar is not coming. I want the user to be able to see a back button in the navigation Bar and clicking the button should take him back to the current page.
I tried to do this via storyboard as well as programmatically. When I try this via the Storyboard, the ViewController itself is not displayed and when I create the view controller object programmatically, I am not getting the Navigation Bar. Any idea how to to this?
I tried to add this code to my viewDidLoad method in DisplayOptViewController:
UINavigationBar *navBar=[[UINavigationBar alloc] init];
[[self navigationController] setNavigationBarHidden:NO animated:YES];
[self.navigationController.navigationBar addSubview:navBar];
But the Navigation Bar still didn't come. Kindly help.
update
I am loading the UICollectionView here
UICollectionViewFlowLayout *aFlowLayout = [[UICollectionViewFlowLayout alloc] init];
[aFlowLayout setItemSize:CGSizeMake(140, 50)];
[aFlowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
DisplayOptViewController *vc=[[DisplayOptViewController alloc] initWithCollectionViewLayout:aFlowLayout];
[self presentViewController:vc animated:YES completion:nil];
You have a few things that i question,
[self.navigationController.navigationBar addSubview:navBar];
you are adding a navigation bar to a navigation bar.... do this instead
[self.navigationController setNavigationBar:navBar];
second
[self presentViewController:vc animated:YES completion:nil];
you are presenting the controller.... not pushing/poping it....
[self.navigationController pushViewController:vc animated:YES];
try that in when you do it programmatically
as for the storyboard maybe you don't have the segues set up correctly, or properties not set right or something... but i can't debug it like this
If you have a navigation based project, then you have to initialize the navigation controller in the app delegate itself. Try the code below to make the navigation bar visible,
In application didFinishLaunchingWithOptions method,
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[ViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:[self viewController]];
[[self window] setRootViewController:navigationController];
[self.window makeKeyAndVisible];
return YES;
Now your navigation bar will appear.
When I push cancel button in the third view, I want to go back to the first view directly.
I also want to remove the second view.
How can I do that?
This is the code.
// this part is in the first view.
self.second = [SecondController alloc] init];
[self.view addSubview:second.view];
// this part is in the second view.
ThirdController *thirdController = [[ThirdController alloc] initWithStyle:UITableViewStyleGrouped];
self.navigationController = [UINavigationController alloc] initWithRootViewController:thirdController];
[self.view addSubview:navigationController.view];
// this part is in the third view.
- (void)cancel {
[self.view removeFromSuperview]; // this only goes to the second view.
}
EDIT:
Can I use popToViewController in called contoller? My app crashes.
I thought popToViewController can be used only in calling controller.
And popToViewController is used when it was pushed.
I did add not push.
[self.navigationController popToViewController:[[self.navigationController viewControllers] objectAtIndex:0] animated:YES];
popToViewController:animated: is a UINavigationController method that you use when popping view controllers off the navigation controller stack. It doesn't fit for this scenario.
This user is adding subviews, not pushing them on a navigation controller stack.
As a note, it appears as a matter of design you should be using a navigation controller with the first view as the root controller, then the second pushed on the stack, and the third pushed on the stack. Then all you have to do is [self.navigationController popToRootViewControllerAnimated:YES].
I think this will work if you want to keep your current architecture:
// this part is in the third view.
- (void)cancel {
// remove the second view (self.view.superview) from the first view
[self.view.superview removeFromSuperView];
// can't recall, possibly you still need to remove the third view, but i think removing the superview will do it.
// [self.view removeFromSuperView];
}
If you prefer to try the UINavigationController route, then the easiest path is to create a new project in Xcode and select the type for a Navigation-Based Application or a Master-Detail Application. This will create a UINavigationController in a nib and add it to your window. You can then set the root view controller in Interface Builder to your FirstViewController class.
If you prefer to create the UINavigationController in code, then that is also possible. I show that below, along with the rest of the code you need, regardless of whether you create your UINavigationController in a nib in IB or in code.
I also recommend reading the View Controller Programming Guide for iOS.
In your app delegate or some other code:
-(void)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions [
// I would recommend setting up the UINavigationController and FirstViewController as IBOutlets in your nib, but it can be done in code.
FirstViewController* fvc = [[FirstViewController alloc] initWithNibName:#"FirstView" bundle:nil];
UINavigationController* navController = [[UINavigationController alloc] initWithRootViewController:fvc];
[window addSubView:navController.view];
[window makeKeyAndVisible];
[fvc release];
[navController release];
}
In the first view controller:
SecondViewController* svc = [[SecondViewController alloc] initWithNibName:#"SecondView" bundle:nil];
[self.navigationController pushViewController:svc animated:YES];
[svc release];
In the second view controller:
ThirdViewController* tvc = [[ThirdViewController alloc] initWithNibName:#"ThirdView" bundle:nil];
[self.navigationController pushViewController:tvc animated:YES];
[tvc release];
In the third view controller:
-(void)cancel {
// returns to the first view controller
[self.navigationController popToRootViewControllerAnimated:YES];
}
Use
- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated
to go back to a specific view controller.
Try this:
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
This will pop to the view at index 1. Hope that Helps!
// this part is in the third view.
- (void)cancel {
self.first = [SecondController alloc] init];
[self.view addSubview:second.view];
}
And I think if you have you don't need to be worried about removing beneath view, later these will removed.
I need to implement the back button; (as in webpages, when you click the back button the screen will set focus to the previous screen).
I am not using a navigation control here, instead i want to do this using a Navigation bar and then adding a navigation button on it. Now when the user clicks on the navigation button the previous view should be displayed.
How should i do this.
My screen looks like this :
When i click on Hello, it should go to the previous screen.
Check out UINavigationController Class Regerence then try something like this:
- (void)pickerCancel {
[self dismissModalViewControllerAnimated:YES];
}
- (void)doSomething {
[myView.navigationItem setBackBarButtonItem:[[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(pickerCancel)] autorelease]];
UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController:myView];
[navigation setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[navigation setDelegate:self];
[self presentModalViewController:navigation animated:YES];
[myView release];
[navigation release];
}
You really should use a UINavigationController as that is its entire purpose.
I used button action to to pop sub view sing below code;
- (IBAction)pickerUpBtn:(id)sender {
PickerPopUpController *screen = [[PickerPopUpController alloc]initWithNibName:#"PickerPopUpController" bundle:Nil];
[self.view addSubview:screen.view];
[self presentModalViewController:screen animated:YES];
}
after i need to go previous window; So i used another button action for it and add bellow code inside action
PickerViewController *screen = [[PickerViewController alloc]initWithNibName:#"PickerViewController" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:screen animated:YES];
But It does not navigate to previous view . How could i do it ??
to go back,
do
[self dismissModalViewControllerAnimated:YES]
You need to put only that single code in the Button action..No need of making object of parentViewController.
ie,
-(IBAction)btnaction:(id)sender{
[self dismissModalViewControllerAnimated:YES];
}
You need to add cancel and done for your ViewController which is present modely to come back to parent view Controller.
After implementing the Cancel button, you have to dismiss your viewcontroller in the action function of Cancel button using the dismissModalViewControllerAnimated function
[self dismissModalViewControllerAnimated:YES];
For push view controller, you can do like below,
PickerViewController *screen = [[PickerViewController alloc]initWithNibName:#"PickerViewController" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:screen animated:YES];
Then for go back, you have to add one button in "Screen" view controller and it's click event you have to write below code,
[self.navigationController popViewControllerAnimated:YES];
Hope, it would be helpful.
Let me know in case of any difficulty.
If you are using the method "presentmodelviewcontroller" then you have to write below line in button click.
[self dismissModalViewControllerAnimated:YES];
Okay, working on a transition between a view with a tabbar and another view which is to be an information/about view. I have the code to transition from the view with tabbar and to transition back to previous view, but during the transition back I lose the tabbar at the bottom. Not sure exactly how to approach this with the tabbar in the MainWindow.xib
E.g.:
(IBAction)backButtonPressed:(id)sender
{
TablesViewController *tvc = [[TablesViewController alloc] initWithNibName:#"TablesView" bundle:nil];
tvc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:tvc animated:YES];
[tvc release];
}
Thanks,
np
Try presenting the modal transition from the containing instance of UITabBarController and not the UIViewController the action was triggered from.
- (IBAction)backButtonPressed:(id)sender
{
TablesViewController *tvc = [[TablesViewController alloc] initWithNibName:#"TablesView" bundle:nil;
tvc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self.tabBarController presentModalViewController:tvc animated:YES];
[tvc release];
}
I had the exact same problem, did a ugly solution:
- (IBAction)backButtonPressed:(id)sender {
[self.navigationController dismissModalViewControllerAnimated:YES];
}