I am currently in the process of switching from Android to the iPhone SDK. I have a TableView where the user selects an item. I am having trouble passing data between controllers. Is there an equivalent to the Android's startActivityForResult or putting extra's into Intents? Like so ...
Intent i = new Intent(this, Foo.class);
i.putExtra("Foo", foo);
Take this in .h file in ParentViewController
NSString *strABC;
Make below function in ParentViewController
-(void)setString:(NSString *)strEntered{
strABC=strEntered;
}
Now In Post view controller do like this:
ParentViewController *objSecond = [[ParentViewController] initwithNibName:#"parentView.xib" bundle:nil];
[objSecond setString:#"Comment Controller"];
[self.navigationController pushViewController:objSecond animated:YES];
[objSecond release];
Now, In secondViewController viewWillAppear Method write this.
-(void)viewWillAppear:(BOOL)animated{
lblUserInput.text = strABC;
}
Please check spelling mistakes as I hand written this. Hope this help.
If you are not using navigationContoller then you can do something like this.
SecondViewControler *objSecond = [[SecondViewController] initwithNibName:#"secondview.xib" bundle:nil];
[objSecond setUserInput:txtUserInput.text];
[objSecond viewWillAppear:YES];
[self.view addSubview:objSecond];
[objSecond release];
Related
navigated from one view to another will and when i pop my view back viewWillAppear method is not calling.
can you please let me know the reason.
When you load View the first time viewWillAppear method is called? try to use
[[self navigationController] popViewControllerAnimated:TRUE];
to return back
It's typical that these problems are caused by improper use of view controller containment. You need to look at your view controller hierarchy and research the following methods:
[UIViewController addChildViewController:];
[UIViewController removeFromParentViewController:];
[UIViewController transitionFromViewController:toViewController:duration:options:animations:completion:]
[UIViewController willMoveToParentViewController:]
[UIViewController didMoveToParentViewController:]
Read the Implementing a Container View Controller section of the UIViewController Class Reference.
If u are doing all well than ur application is crashed some where, use break point and check , even you can check and follow these steps......
step 1. for push in FirstViewController
SecondViewController *second = [[SecondViewController alloc]init]
[self.navigationController pushViewController:second animated:TRUE];
Step 2. for pop in SecondViewController
//check navigation controller exist in ur application stack
NSArray *arrView = [self.navigationController viewControllers];
NSLog(#"arrView %#",arrView);
for(int i = 0; i <[arrView count]-1, i++)
{
if([arrView objectAtIndex:i] isKindOfClass:[FirstViewController class])
{
[self.navigationController popViewControllerAnimated:TRUE];
}
}
I've also met this situation.
In iOS 5, it's ok.
But when I test in iOS 4.3.1, viewWillAppear is not calling.
So you need call viewWillAppear manually
You can try this
[[self.navigationController.viewControllers objectAtIndex:0] viewWillAppear:YES];
[self.navigationController popViewControllerAnimated:YES];
I'm not sure how to do this. So I originally had a ViewController that had one .xib, with one main view. I present it like this:
DogViewController *dvc = [[DogViewController alloc] initWithNibName:#"DogViewController" bundle:nil];
dvc.modalPresentationStyle = UIModalPresentationFormSheet;
dvc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:dvc animated:YES];
[dvc release];
So that works fine. However now from a button press in the DogViewController.xib, I want to dismiss the current form sheet, and show another form sheet with some additional questions before proceeding. So I started by adding another view to in my original .xib of DogViewController, then got stuck in the logic of how to dismiss the first one, and show the second one. I'm assuming I need some outlet to the new view in the same .xib, but from there I'm lost. Thanks.
The way to do this would be to set it up with a UINavigationController as Mathiew mentions. However, if you really want to transition between two views on one view controller, you can refer to this sample code from Apple:
http://developer.apple.com/library/ios/#samplecode/ViewTransitions/Introduction/Intro.html
The code uses ImageViews to demonstrate the effect but I don't see why you can't use views instead :)
You can add a view within the other view in front of all of the other objects and just use its hidden property to control whether it's shown or not.
Why don't you use a navigation controller in your modal view, create another xib and do a [self.navigationController pushViewController:secondViewController animated:YES];
If you have a good reason, you can set a second view outlet secondView and use code like
UIView* superview = [self.view superview];
[self.view removeFromSuperView];
[superview addSubview:self.secondView];
Very simple solution is to hold reference to MainViewController and call methods on it that swap between two view controllers.
Like this:
#implementation MainViewController
- (void)showDogViewController {
[self dismissModalViewControllerAnimated:YES];
DogViewController *dvc = [[DogViewController alloc] initWithNibName:#"DogViewController" bundle:nil];
dvc.modalPresentationStyle = UIModalPresentationFormSheet;
dvc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
dvc.mainViewController = self;
[self presentModalViewController:dvc animated:YES];
[dvc release];
}
- (void)showCatViewController {
[self dismissModalViewControllerAnimated:YES];
CatViewController *cvc = [[CatViewController alloc] initWithNibName:#"CatViewController" bundle:nil];
cvc.modalPresentationStyle = UIModalPresentationFormSheet;
cvc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
cvc.mainViewController = self;
[self presentModalViewController:cvc animated:YES];
[dvc release];
}
}
#end
#implementation DogViewController
- (void)showCatViewController {
[mainViewController showCatViewController]
}
#end
#implementation CatViewController
- (void)showDogViewController {
[mainViewController showDogViewController]
}
#end
hello i am having same issue, i tried your solution but it didnt help me in my case..
i am not getting exception but view is not getting changed..
my piece of code is as below
printf("hi");
//Get the selected country
NSString *selectedCountry = [listOfItems objectAtIndex:indexPath.row];
//Initialize the detail view controller and display it.
DetailViewController *aSecondView = [[DetailViewController alloc] initWithNibName:#"DetailView" bundle:nil];
// aSecondView.selectedCountry = selectedCountry;
[self.navigationController pushViewController:aSecondView];
[aSecondView release];
aSecondView = nil;
printf("bye..");
both hi and bye gets printed but view doesnt change..
i have wasted 2 days around it ..
plz help me out..
Check the nib name.How did you created the nib file for the detail view?.It will be created by default as DetailViewController in your case.So change the initWithNibName.Why do you set the aSecondView=nil?
as kovpas said , that subclass your controller from UIViewController instead of UINavigationController ,you use presentModalViewController. for implementing navigation controller put this code in your delegate class
- (void)applicationDidFinishLaunching:(UIApplication *)application {
UINavigationController *nvcontrol =[[UINavigationController alloc] initWithRootViewController:viewController];
[window addSubview:nvcontrol.view];
[window makeKeyAndVisible];
}
Seems, that you subclass your controller from UIViewController instead of UINavigationController
Try to use
[self presentModalViewController:aSecondView animated:YES];
Dismiss it with
[self dismissModalViewControllerAnimated:YES];
in case if you un comment your commented code...one another problem that i found in your code... interchange these 2 lines...
aSecondView.selectedCountry = selectedCountry;
[self.navigationController pushViewController:aSecondView];
try Put it like this
[self.navigationController pushViewController:aSecondView];
aSecondView.selectedCountry = selectedCountry;
if you uncommnet the line it may create problem
I am a newbie iPhone Programmer and have a question regarding how to access methods of a Parent View Controller.
In my program when the program first loads (applicationDidFinishLaunching) I do the following code:
[window addSubview:rootViewController.view];
[window makeKeyAndVisible];
which basically calls this
- (void)viewDidLoad {
HomeViewController *homeController=[[HomeViewController alloc] initWithNibName:#"HomeView" bundle:nil];
self.homeViewController=homeController;
[self.view insertSubview:homeController.view atIndex:0];
[homeController release];
[super viewDidLoad];
}
Now, I have an IBAction call on HomeViewController that I want to have it call a method in root View Controller
I want to call this method
- (void)loadNewGame
{
self.questionViewController = [[QuestionViewController alloc] initWithNibName:#"QuestionView" bundle:nil];
//[homeViewController.view removeFromSuperview];
[self.view insertSubview:questionViewController.view atIndex:0];
}
So my question is how do I call a method from the Parent View controller?
I've tried
[self.view removeFromSuperview];
[self.parentViewController loadNewGame];
but that doesn't seem to work. Could someone please ploint me in the right direction.
Thanks in advance
Scott
First off, typically you call [super viewDidLoad] first in your viewDidLoad.
You will have to have an instance variable in your homeController class for your rootViewController. Then you could have a method in homeController:
- (void) loadNewGame
{
[self.rootViewController loadNewGame];
}
This is one of many different ways to accomplish this. You may want to move the method to homeController completely. Or you may wish to have IB use the rootViewControllers' methods directly...
Here is another discussion of this.
First off your code doesn't really make sense. Why are you adding your HomeViewController in a -viewDidLoad call. If you want to load the HomeViewController as the initial view, you should set that in Interface Builder instead of RootViewController. When you want to display a new view controller, you should be using a navigation controller stack and pushing the new view controller onto it with [[self navigationController] pushViewController:newViewController animated:YES].
Assuming you get that sorted, you should create a delegate (id) field for your child view controller that you can set when you instantiate the new view controller. So your code might look something like this:
HomeViewController *homeController=[[HomeViewController alloc]
initWithNibName:#"HomeView" bundle:nil];
[homeController setDelegate:self];
[[self navigationController] pushViewController:homeController animated:YES];
[homeController release];
Then, when your action gets fired in the HomeViewController, you can check to see if the delegate is set and if so, call the selector in question, like this:
- (IBAction)action:(id)sender;
{
if (delegate && [delegate respondsToSelector:#selector(loadNewGame)])
[delegate performSelector:#selector(loadNewGame)];
}
You might want to read Apple's docs on how to use the navigation controller stack. This might help clarify some things.
I need to display a couple of view controllers (eg, login screen, registration screen etc). What's the best way to bring each screen up?
Currently for each screen that I'd like to display, I call a different method in the app delegate like this:
Code:
- (void) registerScreen
{
RegistrationViewController *reg = [[RegistrationViewController alloc] initWithNibName:#"RegistrationViewController" bundle:nil];
[window addSubview:reg.view];
}
- (void) LoginScreen
{
LoginViewController *log = [[LoginViewController alloc] initWithNibName:#"LoginViewController" bundle:nil];
[window addSubview:log.view];
}
It works, but I cant imagine it being the best way.
I'd recommend reading the View Controller Programming Guide if you haven't: http://developer.apple.com/iphone/library/featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html
It sounds like presenting a view controller modally may be your best bet - but you'll probably want to wrap it in an UINavigationController first.
eg
UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:theControllerYouWantToPresent] autorelease];
[self presentModalViewController:navController animated:YES];
I've often wondered if this is the best way myself, but when I'm not using IB's built-in stuff (like a NavigationController) I have a single method in the AppDelegate, switchToViewController:(UIViewController *)viewController that I pass...well, it's pretty self-explanatory I guess. This way there's only one place where it's done, and I can easily define transitions in that method once the app nears completion.
Also, don't forget to remove the previous views in your methods, otherwise you're liable to run out of memory. Something like this:
-(void) switchToViewController:(UIViewController *)c {
if(c == currentController) return;
[currentController.view removeFromSuperview];
[window addSubview:c.view];
[currentController release];
currentController = [c retain];
}