As you guess am still a newbie, getting my head around iphone development.
I am just trying out basic view loading on demand, which i cant get to work
I have an app, with 2 view controllers, each view controller connected a different nib file.
I am trying to switch between view manually; there is no navigation control involved.
How can i manually push the second view to the first view?
self.navigationController pushViewController wont work since there is no navigation controller.
How else can I push the second view on top of the first view and destroy the first view; and ofcourse vice versa?
I have done this in the first view's button action:
SecondView *sv=[[SecondView alloc] initWithNibName:#"SecondView" bundle:nil];
[self.navigationController pushViewController:sv animated:YES];
obviously, it didn't work.
window addSubView didn't work either, because the first view controller is the root view controller (not sure i said that right). In other words, when i run the app, the first view is what I see with a button that is supposed to load the second view.
I have spent hours searching for a simple example, and I couldn't find any.
Any suggestions?
in the first view controller you need this:
- (IBAction)pushWithoutViewController:(id)selector {
NextNavigationController *page = [[NextNavigationController alloc] initWithNibName:NextNavigationController bundle:nil];
CGRect theFrame = page.view.frame;
theFrame.origin = CGPointMake(self.view.frame.size.width, 0);
page.view.frame = theFrame;
theFrame.origin = CGPointMake(0,0);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.8f];
page.view.frame = theFrame;
[UIView commitAnimations];
[self.view addSubview:page.view];
[page release];
}
and then link it to the button in nib. :)
try :
SecondView *sv=[[SecondView alloc] initWithNibName:#"SecondView" bundle:nil];
[self presentModalViewController:sv animated:YES];
IF you have first xib and you want to give navigation to another controller then you have to declare navigation in to appdelegate.m
write following code to app
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController = navController;
then in ViewController.m
- (IBAction)NextButtonClicked:(id)sender
{
yourNextViewController *objyourNextViewController = [[yourNextViewController alloc] initWithNibName:#"yourNextViewController" bundle:nil];
[self.navigationController pushViewController:objStartUpViewController animated:TRUE];
}
Related
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 have a button that when clicked shows a view controller. The code for that event is:
and my view controller looks like this:
note the segmented control and background image.
Here is my h and m files of my view controller in case you need them:
when I run my app here is how that view control looks on my iPad:
why do the background image and segmented control do not appear? why are contents not being loaded? It looks like another view controller is being loaded but I have already make sure that I am placing the correct name in the string for the view controller.
- (IBAction) vaClick
{
imgVa.image = [UIImage imageNamed:#"bt-valores.png"];
UIViewController *control = [[NuestrosValoresViewController alloc] initWithNibName:#"NuestrosValoresViewController"
bundle:nil];
UINavigationController *navControl = [[UINavigationController alloc]
initWithRootViewController:control];
[self presentModalViewController:navControl animated:NO];
[navControl setNavigationBarHidden:YES];
[control release];
[navControl release];
//UINavigationController *navControl = [[UINavigationController alloc]
//initWithRootViewController:control];
//[self presentModalViewController:navControl animated:NO];
}
should I release it like this? sorry I basically have to translate a power point presentation to an app therefore I know very little about objective-c. thanks for the help and sorry for the dumb question.
You're not setting the root view controller of your UINavigationController.
Use this line instead when initializing the navigation controller:
UINavigationController *navControl = [[UINavigationController alloc] initWithRootViewController:control];
You'll also want to release navControl after you present it modally. I'll write out the code for you if you post your code instead of using screenshots.
I'm using a Navigation Controller. My RootViewController pushes a number of views but it also presents a modal view. That modal view presents a tableView. So what I'm trying to do is figure out of I can push the Navigation Controller across the modal view, then use it from that modal view to push the view with the tableView? or barring that, is there a way to implement a second Navigation Controller from the modal view?
The real issue is that I want to present the view with the tableView using a right to left transition, which of course is not available with modal views.
I have this code that SORT OF provides the right to left transition used by the Navigation Controller:
NewViewController *newViewController = [[NewViewController alloc] init];
[self presentModalViewController:newViewController animated:NO];
CGSize theSize = CGSizeMake(320, 460);
newViewController.view.frame = CGRectMake(0 + theSize.width, 0 + 20, theSize.width, theSize.height);
[UIView beginAnimations:#"animationID" context:NULL];
[UIView setAnimationDuration:0.5];
newViewController.view.frame = CGRectMake(0, 0 + 20, 320, 460);
[UIView commitAnimations];
[newViewController release];
The problem is that the OldViewController (the one calling the NewViewController) disappears immediately so the NewViewController transitions across a blank screen, instead of covering the OldViewController.
Presenting a UIViewController modally creates a whole new navigation stack. You could do something like this:
//Create the view you want to present modally
UIViewController *modalView = [[UIViewController alloc] init];
//Create a new navigation stack and use it as the new RootViewController for it
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:modalView];
//Present the new navigation stack modally
[self presentModalViewController:nav animated:YES];
//Release
[modalView release];
[nav release];
This can be done because UINavigationController is a subclass of UIViewController. When the new view is loaded, you can use it however you wish (push another view on top of it, us UIView animations like Waqas suggeste, etc').
I hope I got your question correctly. Do tell if I didn't.
I wanted to create a very simple method that switches between views in a view based application. For some reason, when the views are switched, the first view is removed and instead of viewing the second view, I see a white screen.
This is my method:
FirstViewController *firstViewController = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
self.view = firstViewController.view;
[firstViewController.view removeFromSuperview];
[firstViewController release];
secondViewController = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
self.view = secondViewController.view;
I don't know why it is happening because I know that the second view's ViewDidLoad method is called (I put a NSLog there) - but the second view is not seen!
Any suggestions?
Thanks in advance,
Sagiftw
viewDidLoad's executing because initWithNibName:bundle: calls it. That doesn't mean that the view's actually being displayed.
I usually use this (removing initialisation/release logic):
[self.view addSubview: firstViewController.view];
[firstViewController.view removeFromSuperview];
[self.view addSubview: secondViewController.view];
I don't use IB much for creating my views, so I usually do everything programatically. I'm bascially pushing a viewController to a navigation controller and it seems the top part of the viewController is under the navigation bar. I'm trying to make the view fit correctly.
Here is my code:
navigationController = [[UINavigationController alloc] initWithNibName:nil
bundle:nil];
[window addSubview:navigationController.view];
viewController = [[UIViewController alloc] init];
//this code was just added to try and make it fit. It doesn't change anything
viewController.view.frame = [UIScreen mainScreen].applicationFrame;
[navigationController pushViewController:viewController animated:NO];
I would be careful using the init method with view controllers - instead look at initWithNibName:bundle:.