Hey guys I need some help with this:
I have two view controllers, let's say:
FirstViewController (first) is inside a navigationviewcontroller
SecondViewController (second)
So in the first's viewDidLoad method I have this:
SecondViewController *second = [[SecondViewController alloc] initWithNibName:...];
[self.addsubview:second.view];
I've done this cuz I want to make my custom tab bar with my custom buttons and colors.
I have this when I press one of the buttons of my custom "tab bar" (seconviewcontroller)
ConfiguracionViewController *conf = [[ConfiguracionViewController alloc] initWithNibName:#"ConfiguracionView" bundle:nil];
[self.navigationController pushViewController:conf animated:YES];
[conf release];
but because the second view controller is not pushed or modal presented in the first view controller I can't acces the navigationController. I've tried also with this
[self.parentViewController.navigationController pushViewController:...];
But it didn't work either.
Please help me out, I need to learn how to do that and sorry for my bad english.
Best Regards,
Carlos Vargas
First, shouldn't you be adding the second view to the first view like this:
[self.view addSubview:second.view];
The property parentViewController will not work in this case since second is not part of a navigation hierarchy.
Instead, you can make your own property that references the "parent" view controller:
SecondViewController *second = [[SecondViewController alloc] initWithNibName:...];
// set new property
second.parentVC = self;
[self.view addSubview:second.view];
In SecondViewController.h you need to declare the instance variable and property for "parentVC" and in SecondViewController.m you need to synthesize the property.
Then, you should be able to access the navigation controller and push a view controller from SecondViewController.m like this:
[self.parentVC.navigationController pushViewController:...];
Related
I have a ViewBased App. I added a UITableView on one of the UIViewControllers. It shows the data and I implemented all the delegate methods etc. My problem is when I want to show the detailView it just doesn't happen. My code:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailViewController *detailViewController =[[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
NSLog(#"DidSelectRowAtIndexPath");
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
}
I see that I need a navigationController but I don't have one and I was unsucessful trying to add one programatically. I don't have one in my appDelegate either, so my question is do I need to add one to show the detail view? If yes, please give me a code sample how to do that.
If not, what other way is there?
I am new to iOS so I am a bit lost here.
Please help!
To add a navigation controller programmatically just for this detail view, you need to something like this:
UINavigationController * controller = [[UINavigationController alloc] initWithRootViewController:detailViewController];
[[detailViewController] release];
[self presentModalViewController: controller animated: YES];
If you want to use pushViewController, you need to already have a navigation controller surrounding the view you're starting with.
You need to add the Navigation Controller FIRST, then your master table becomes the root view controller of the nav controller, then when you tap a row in the table, you push another view controller onto the nav stack.
How does your master table get into the app in the first place? If you're using a nib, it's super easy to just change out the view controller for a nav controller with the old view controller added as a child of the nav controller.
You can create one programmatically by working within your app delegate's application:didFinishLaunchingWithOptions: method like so:
UITableViewController *tableViewController = [[[WhateverYourSubclassVCIsCalled alloc] init] autorelease];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:tableViewController];
window.rootViewController = navController;
[window makeKeyAndVisible];
I am using this code to hide a button in a different view controller, but the button does not get hidden when the button is pressed to hide the button in the other view controller.
This is the code I am using to hide the button in the other view controller:
[self dismissModalViewControllerAnimated:YES];
NSLog(#"Exited");
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
[vc.mainbutton1 setHidden:YES];
Why is this not working?
Thanks!
take a BOOL variable in ViewController controller and make the property and synthesize also.
and do this.
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
vc.check = YES;
in the view controller viewdidload
write this
if(self.check)
[mainbutton1 set hidden:YES];
The other answers should work unless...
Judging by your code I am going to guess that you are trying to hide a button on the viewController that presented the modal view?
If this is correct then what you are doing will not work as you are creating a new instance of ViewController which is not the already existing viewController you want to use.
Although the docs say that it is fine to call [self dismissModalViewControllerAnimated:YES]; from the presented modal view I tend to set up a delegate to handle the dismissal like in Apple's utitliy app template.
The reason this isn't working is because even though you have alloc'd and init'd the ViewController properly, the actual elements of that vc ViewController (including mainbutton1) have not been loaded yet.
Hitman has the right idea (and I'm voting his idea up).
Either put in a BOOL property for setting mainButton1 to hidden when the view appears, or call your [mainButton1 setHidden: YES] right after you explicitly display the view (via animation or adding subviews or whatever).
From your question it sounds like you want to hide the button in an existing view controller, whereas in your code you are creating a new one
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
[vc.mainbutton1 setHidden:YES];
Either the view controller which you observe is not the one you expect or the mainbutton1 outlet is not connected properly. You can check if the memory controller is the one you expect by logging its memory address.
NSLog(#"Hid button for view controller %p", vc);
And doing the same in the viewDidAppear callback of ViewController
NSLog(#"In viewDidAppear for view controller %p", self);
It seems you want a certain button to be hidden if something has been happening somewhere else.
You COULD, somewhat as a hack (but I don't mind that very much) control this with a variable on your AppDelegate for instance.
When the "something" is happening "somewhere else", do this:
MyAppDelegate *appDelegate = [[(MyAppDelegate *)UIApplication sharedApplication] delegate];
appDelegate.shouldHideThatOtherButtonLater = YES;
Then, when you create your new ViewController later on you could use this value to determine if your button should be visible or not like this:
ViewController *vc = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
MyAppDelegate *appDelegate = [[(MyAppDelegate *)UIApplication sharedApplication] delegate];
[vc.mainbutton1 setHidden: appDelegate.shouldHideThatOtherButtonLater ];
You will in this case have to prepare your AppDelegate for this by creating and synthesizing that shouldHideThatOtherButtonLater-property.
I have a View application with a Single UIViewController. I then add a UITableViewController through the IB, and I am trying to display the UITableViewController through a button press in the UIViewController (my main view). My button press (IBAction) contains the following code through which I am trying to push my UITableViewController view and display it:
DataViewController *dataController = [[DataViewController alloc] initWithNibName: #"DataViewController" bundle:nil];
[self.navigationController pushViewController:dataController animated:YES];
[dataController release];
My DataViewController is not at all getting pushed into the stack and displayed,
Also I have checked that in the code above, self.navigationController=nil
Probably this is the source of the problem. If so, how to rectify it?
Please help.
UINavigationController *navCtrlr = [[UINavigationController alloc]initWithRootViewController:yourfirstviewController];
[self.window setRootViewController:navCtrlr];
navCtrlr.delegate = self;
navCtrlr.navigationBarHidden = YES;
Create navigation controller in appdelegate.m then you can navigate to any uiviewcontroller
You need to actually create a UINavigationController. The navigationController property tells you whether your DataViewController is currently in a UINavigationController's hierarchy; if not (as in this case), the navigationController property returns nil.
I am showing a modal view which is a UITableViewController class. For some reason it won't show the navigation bar when I show it. Here is my code:
SettingsCreateAccount *detailViewController = [[SettingsCreateAccount alloc] initWithStyle:UITableViewStyleGrouped];
detailViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
detailViewController.navigationController.navigationBarHidden = NO;
[self.navigationController presentModalViewController:detailViewController animated:YES];
detailViewController = nil;
[detailViewController release];
I thought it was shown by default? If it helps, I am calling this from another class that is also a UITableViewController managed by a UINavigationController. Ideas?
When you present a modal view controller it does not use any existing navigation controllers or navigation bars. If all you want is to display a navigation bar, you need to add the navigation bar as a subview of your modal view and present it as you're doing.
If you want to present a modal view controller with navigation functionality, you need to present a modal navigation controller containing your detail view controller instead, like so:
SettingsCreateAccount *detailViewController = [[SettingsCreateAccount alloc] initWithStyle:UITableViewStyleGrouped];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
[detailViewController release];
navController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:navController animated:YES];
[navController release];
Your modal controller will manage its own navigation stack.
Here is one way to display navigation bar for those who are using storyboards, suggested by Apple's Tutorial on Storyboard.
Because a modal view controller doesn’t get added to the navigation stack, it doesn’t get a navigation bar from the table view controller’s navigation controller. To give the view controller a navigation bar when presented modally, embed it in its own navigation controller.
In the outline view, select View Controller.
With the view controller selected, choose Editor > Embed In > Navigation Controller.
On iOS 7 and you just want a navigation bar on your modal view controller to show a title and some buttons? Try this magic in your UITableViewController:
// in the .h
#property (strong) UINavigationBar* navigationBar;
//in the .m
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = #"Awesome";
self.navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectZero];
[self.view addSubview:_navigationBar];
[self.navigationBar pushNavigationItem:self.navigationItem animated:NO];
}
-(void)layoutNavigationBar{
self.navigationBar.frame = CGRectMake(0, self.tableView.contentOffset.y, self.tableView.frame.size.width, self.topLayoutGuide.length + 44);
self.tableView.contentInset = UIEdgeInsetsMake(self.navigationBar.frame.size.height, 0, 0, 0);
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
//no need to call super
[self layoutNavigationBar];
}
-(void)viewDidLayoutSubviews{
[super viewDidLayoutSubviews];
[self layoutNavigationBar];
}
I want to share how the accepted solution can be used in projects with storyboards:
The simple approach is to put in a storyboard blank navigation controller before the VC which is to be presented modally, so the relations look like:
(Presenter VC) -> presents modally -> (navigation controller having a controller to be presented as its root).
We've tried this approach for a while and noticed that our storyboards become "polluted" by a large number of such intermediate navigation controllers when each! of them is used exclusively for one! presentation of some other controller, that we want to be presented modally with navigation bar.
Our current solution is to encapsulate the code from accepted answer to a custom segue:
#import "ModalPresentationWithNavigationBarSegue.h"
#implementation ModalPresentationWithNavigationBarSegue
- (void)perform {
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:self.destinationViewController];
[self.sourceViewController presentViewController:navigationController animated:YES completion:nil];
}
#end
Having this segue in our project we do not create intermediate navigation controllers in our storyboards anymore, we just use this ModalPresentationWithNavigationBarSegue like:
Presenter VC --> Presentee VC
I hope that this answer will be helpful to people who like to avoid unnecessary duplication in their apps storyboards.
I just wanted to add something to what #Scott said. His answer is definitely the easiest and most accepted way of doing it now with Storyboards, iOS 7 and 8... (and soon, 9).
Definitely adding a view controller to the Storyboard and Embedding it as described by #Scott is the right way to go.
Then, just add the segue by control-dragging from the source view controller to the target (the one you want to show modally), select "Present Modally" when the little view appears with the choices for the type of segue. Probably good to give it a name too (in the example below I use "presentMyModalViewController").
One thing that I needed that was missing is #Scott's case is when you want to actually pass on some data to that modally-presented view controller that is embedded in the navigation controller.
If you grab the segue.destinationViewController, it will be a UINavigationController, not the controller you embedded in the UINavigationController.
So, to get at the embedded view controller inside the navigation controller, here's what I did:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"presentMyModalViewController"]) {
// This could be collapsed, but it's a little easier to see
// what's going on written out this way.
// First get the destination view controller, which will be a UINavigationController
UINavigationController *nvc = (UINavigationController *)segue.destinationViewController;
// To get the view controller we're interested in, grab the navigation controller's "topViewController" property
MyModalViewController *vc = (EmailReceiptViewController *)[nvc topViewController];
// Now that we have the reference to our view controller, we can set its properties here:
vc.myAwesomeProperty = #"awesome!";
}
}
Hope this helps!
If you only need a NavigationBar, you can add an instance of UINavigationBar and assign BarItems to it.
I am creating a Navigation based iPhone application.
In that I have called a UiViewController using presentModalViewController. After that, the ViewController becomes visible. From that ViewController I need to call another ViewController using the sample presentModalViewController. Is this possible or not?
What do you mean by "call another uiviewcontroller"? (It really helps if you can be more detailed in your question.) If you mean, "slide in another view controller", then:
MyNewViewController *myNewViewController = [[MyNewViewController alloc] initWithNibName:#"MyNewViewController" bundle:nil];
[navigationController pushViewController:myNewViewController animated:YES];
[myNewViewController release];
...where:
MyNewViewController is the new view controller class that you want to slide in (the above code assumes you have an XIB file for the view controller class).
navigationController points to the current navigation controller. You'll have to replace it with something like [self navigationController], depending where you are in the view hierarchy.
U might be using following line to present a view controller.
//assume name of viewController which u want to present is "myViewController"
[self.navigationController presentModalViewController:myViewController animated:YES]
If you want to push an other ViewController or present an other ViewController then u will need to replace above line with following lines.
//[self.navigationController presentModalViewController:myViewController animated:YES];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:myViewController];
navigationController.navigationBarHidden = YES; //if u want to show navigation bar then remove this line
[self presentModalViewController:navigationController animated:YES];
After using above code you can present or push other view controllers within presented view controller.
Hope it will solve your problem :)