starting a new project and want to try using the storyboard feature of xcode 4.2. i got the basics of how to do transitions within the story board, but how do i do it in the code (load a new view w/out the use of a button)?
do i just use the old method,
mapViewController *mapView = [[mapViewController alloc] initWithNibName:#"mapViewController" bundle:[NSBundle mainBundle]];
[self presentModalViewController:mapView animated:YES];
?
EDIT:
the old way doesn't work. also tried:
MapViewController *mapView = [self.storyboard instantiateViewControllerWithIdentifier:#"MapView"];
self presentModalViewController:mapView animated:YES];
with no success.
If you want to load a view controller you made in a storyboard create a segue to this view controller, give it an identifier and call: performSegueWithIdentifier:sender:.
ok, i figured out the issue. i had uncommented the method "loadView" in the mapViewController so xcode did not use my storyboard layout.
also, both above methods do work to do a modal switch.
Related
Lets say that I have 4 view controllers (call them FirstView,SecondView,ThirdView,FourthView) which are created programmatically and all are in separate files:
In AppDelegate.m didFinishLaunchingWithOptions method I have these lines of code
self.rootViewController = [[rootViewController alloc]initWithNibName:#"rootViewController" bundle:nil];
self.window.rootViewController = self.rootViewController;
In rootViewController.m loadview method I have
self.view = [[UIView alloc]initWithFrame:[UIScreen mainScreen].applicationFrame];
self.firstView = [[FirstView alloc]init];
[self.view addSubview:self.firstView.view];
That code works fine - first view is displayed.
Let's continue
In FirstView.m switchViews method
NOTE: Please see the comments in code
self.secondView = [[SecondView alloc] initWithNibName:#"SecondView" bundle:nil];
// I think here secondView is added to rootViewController - right ?
[self.view.superview addSubview:self.secondView.view];
// Here first view is removed from rootViewController - right ?
[self.view removeFromSuperview];
Here is how I add/remove views.
Is this approach correct?
Can you recommend a better solution?
I have read about UINavigationController, but I don't think it could be a solution in this case.
You say:
I have 4 views (call them FirstView ...
Then you say:
[self.view addSubview:self.firstView.view];
Which makes me think that FirstView isn't actually a UIView - as you claim it is. Instead, it's probably a UIViewController - a different beast altogether.
If my suspicion is correct - then you are "off-track" so to speak.
Going beyond that to your sample code snippet:
self.secondView = [[SecondView alloc] initWithNibName:#"SecondView" bundle:nil];
// I think here secondView is added to rootViewController - right ?
[self.view.superview addSubview:self.secondView.view];
// Here first view is removed from rootViewController - right ?
[self.view removeFromSuperview];
This is definitely not a great idea. Here's why:
First: your view controller doesn't explicitly "know" anything about the superview you are so casually inserting and removing subviews to/from - so it shouldn't do that. You may, alternatively, create your own view and insert/remove subviews from that - which would not only be perfectly acceptable but also common practice.
Second: if these are actually UIViewControllers like I think they are - then you are not properly handling hooking them up to the UIViewController event chain - which means methods on these subclasses like viewDidAppear: or viewDidUnload will not fire.
From what I see in your code, UINavigationController seems like it would help. If you don't want a navigation bar, you can definitely hide it, but the methods in UINavigationController should help you with switching views.
If your views only need to display temporarily, you could also use Modal View controllers. An example of Modal View controllers can be found here.
If you haven't already, check out the View Controller Programming Guide from Apple.
I have started my iOS 5 app using a storyboard, however if I want to programatically modally present a view, how can I? I can't use initWithNibName as there are no longer nob files, but a storyboard.
E.g. this will give me a blank UINavigationView and not my Interface Builder one:
setupView = [[setupController alloc] initWithNibName:nil bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:setupView];
[self presentModalViewController:navigationController animated:YES];
If I use a button in interface builder (in my storyboard) and link the two views with it using 'Modal' it works a charm, but I want to do it programatically.
Thanks.
Turns out I think I have been looking for performSegueWithIdentifier and it works a charm.
Beginning Storyboards in iOS 5 Part 1 explained everything in details.
Imagine that we have multiview apllication which is controlled by Navigation Controller. We go from the first view to second by using pushViewController method and that's not a problem but then we need to move to the third view. And the third one is a view which looks like a TabBar. How do we do that? The third view is supposed to be controlled by TabBarController, isn't it?
So how to pass the control? I declared an outlet UITabBarController * tbc and connected it to TabBarController in xib file and then i tried this in viewDidLoad:
tbc = [[UITabBarController alloc]init];
and it shows nothing.
Your help is highly appreciated
It's a bit wierd. Its more standard to have a tabBarController that switches views and some of those views may be navigation controllers. But ...
Create the UITabBarController and push it.
NSMutableArray *viewControllers = [[NSMutableArray alloc] init];
// create someView
[viewControllers addObject:someView];
// create someView2
[viewControllers addObject:someView2];
UITabBarController *tabController = [[UITabBarController alloc] init];
[tabController setViewControllers:viewControllers];
[[self navigationController] pushViewController:tabController animated:YES];
Then, from the tabBarContoller view, based on some action, you can choose to pop it:
[self.navigationController popViewControllerAnimated: NO];
You can wire it up in the storyboard editor in the latest version of Xcode.
However, since this is very much non-standard use of the controls, you would need a very good reason as to why you would want a UI like this.
And even then, Apple's review process might turn your app down if the interface is clunky.
i am unable to get the pushViewController to work on a View Based Application on the iPhone. On my 'ProjectViewController' i have a IBAction with the following code :
-(IBAction)switchAugmented
{
ARViewController *viewController = [[ARViewController alloc] initWithDelegate:self];
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
}
When i run the program and press ibaction nothing happens. Besides that statement above do i need to do anything else to make the view appear? what am i missing?
(...) on a View Based Application (...)
You just have no UINavController! Try to embed your main view in UINavigationController and everything will start working.
Double check to make sure that the button you are pressing is connected to the right method in interface builder. Also try putting an NSLog statement in the switchAugmented to see if the method is getting called.
You also have to check and see if you have a UINavigationController instance, otherwise you won't be able to push a new view controller.
You won't be able to push a new view controller in a View Based Project. You need to create a Navigation Based Project or add an instance of the UINavigationController in your Main.nib (if your using a nib file) only then will the push view controller will work
I am in the appdelegate of my application. How can I add a modal view controller in the "didfinishlaunching" method?
I tried the following but did not work
SomeViewController *vc = [[SomeViewController alloc]init];
[self.tabController.navigationController presentModalViewController:vc animated:NO];
EDIT:
I changed my implementation to the following
self.tabController.selectedViewController
= [self.tabController.viewControllers objectAtIndex:0];
SomeViewController *vc = [[SomeViewController alloc]init];
[self.tabController.selectedViewController presentModalViewController:vc animated:NO];
I checked that the 'selected view controller' is not null... however I am still not able to get the output I needed. Is there anything I am missing?
Assuming tabController and navigationController are not nil, the applicationDidFinishLaunching may be too soon to display the modal view controller.
Make sure you put that code after you make the window key and visible. [self.window makeKeyAndVisible];
If that does not work try listening for the UIWindowDidBecomeKeyNotification for that window
You can try delaying presentation of that modal a few seconds using performSelector:withObject:afterDelay: