hours ago I post a question on organizing portrait and landscape mode in iPhone and now I think I know how to do it using willRotateToInterfaceOrientation:duration.
The first screen is 'Map View' with one button that leads to 'Setting View'. The Map View does not support rotate but for the Setting View I made separate view for portrait and landscape and they swap accordingly when rotated.
, ,
As you can see when Setting button pressed SettingView is added on the view stack as usual. So basically I use three view controllers; Setting, SettingLandscape and SettingPortrait.
I still found problem in rotating view in iPhone when I use navigationViewController. Segmented control is not working. it crashes without error message. It used to working fine without rotation.- when I'm not using multiple view for rotation-.
rotateViewController.m
This is root view controller.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
-(IBAction) buttonPressed{
Setting *settingViewController = [[Setting alloc] initWithNibName:#"Setting" bundle:[NSBundle mainBundle]];
UINavigationController *navController1 = [[UINavigationController alloc] initWithRootViewController: settingViewController];
[self.navigationController presentModalViewController:navController1 animated:YES];
[settingViewController release];
[navController1 release];
}
Setting.m
This view controller does nothing but swap views when rotate and shows appropriate view between portrait and landscape.
In Setting.m, I swap view as follow;
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (toInterfaceOrientation==UIInterfaceOrientationLandscapeRight) {
NSLog(#"to Right");
SettingLandscape *setting_landscape = [[SettingLandscape alloc] initWithNibName:#"SettingLandscape" bundle:[NSBundle mainBundle]];
self.view = setting_landscape.view;
[setting_landscape release];
}
if (toInterfaceOrientation==UIInterfaceOrientationLandscapeLeft) {
NSLog(#"to Left");
SettingLandscape *setting_landscape = [[SettingLandscape alloc] initWithNibName:#"SettingLandscape" bundle:[NSBundle mainBundle]];
self.view = setting_landscape.view;
[setting_landscape release];
}
if (toInterfaceOrientation==UIInterfaceOrientationPortrait) {
NSLog(#"to Portrait");
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
if (toInterfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
NSLog(#"to PortraitUpsideDown");
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
}
In viewWillAppear, Setting view controller also has ;
self.title = #"Shell ";
self.navigationController.navigationBarHidden = NO;
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStylePlain target:self action:#selector(Done)] autorelease];
and Done is
- (void) Done{
[self dismissModalViewControllerAnimated:YES];
}
SettingLandscape.m
This view stacked on when the view is rotated. This view controller has it's navigation bar.
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.title = #"Setting Landscape";
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
in viewDidLoad;
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(#"landscape:viewDidLoad");
//self.title = #"SettingLandscape";//not working!!
//self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Done1" style:UIBarButtonItemStylePlain target:self action:#selector(Done)] autorelease];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
stringflag4MapType = [[NSString alloc] initWithString:#"blah"];
stringflag4MapType = [defaults stringForKey:#"flag4MapType"];
if (![stringflag4MapType isEqualToString:#"Hybrid"] && ![stringflag4MapType isEqualToString:#"Standard"] && ![stringflag4MapType isEqualToString:#"Satellite"]) {
segmentedControl4MapType.selectedSegmentIndex = 0;
}else if ([self.stringflag4MapType isEqualToString:#"Standard"]) {
segmentedControl4MapType.selectedSegmentIndex = 0;
}else if ([self.stringflag4MapType isEqualToString:#"Satellite"]) {
segmentedControl4MapType.selectedSegmentIndex = 1;
}else if ([self.stringflag4MapType isEqualToString:#"Hybrid"]) {
segmentedControl4MapType.selectedSegmentIndex = 2;
}
and following call does not get invoked. strange. doesn't matter rotation works anyway.
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (toInterfaceOrientation==UIInterfaceOrientationPortrait) {
NSLog(#"to Portrait");// does not print out.
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
if (toInterfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
NSLog(#"to PortraitUpsideDown");
SettingPortrait *settingportrait = [[SettingPortrait alloc] initWithNibName:#"SettingPortrait" bundle:[NSBundle mainBundle]];
self.view = settingportrait.view;
[settingportrait release];
}
}
ok now, as you can see from those snap shots there are two navigation bar and each has its bar button, Done and Item. The Done button came from Setting and the Item button from SettingPortrait or SettingLandscape. All button's selector is same, that leads back to map view. The button Done works fine, but the button Item crashes. I need a button on navigation bar after rotation that acts like back button . I guess once I did 'self.view = settingportrait.view;' the problem starts.
The reason why I need the Item button work is that the segmented control started crashing once I add code to support rotation. If I found reason how to make the Item button-that is inside rotation view- work I think I can make the segmented control work as well.
You can download the whole code at https://github.com/downloads/bicbac/rotation-test/rotate-1.zip
https://github.com/downloads/bicbac/rotation-test/rotate-1.zip
this sample code is amazing for me. It solve my problem of rotating view just by simple delegate method
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
my best attempt to answer question without looking at code (don't have time tonight :( )
When you present setting viewcontroller modally, your top viewcontroller is setting.
When rotation happens, you load setting_landscape or setting_portrait viewcontroller, but only retain the view inside setting_landscape|portrait. Thus, setting_landscape/portrait viewcontrollers are released. When device is rotated, it's probably "setting" viewcontroller receiving rotation message, not the "setting_landscape/portrait" viewcontroller because they are not pushed on to the viewcontroller stack.
So, when you click on item or segment control, it will call delegate, which is probably set to setting_landscape|portrait which is released already.
What is the message in console you get with crash?
My recommendation would be to build setting viewcontroller with segmented control, then use "willAnimateRotationToInterfaceOrientation:duration:" function to reposition the segmented control to the right position and frame. Just by returning YES to all orientation, rotation should be supported, doesn't it?
What was the reason for using two separate viewcontroller for landscape/portrait? (I do this sometimes, but rarely)
Edit* you need to use "willAnimateRotationToInterfaceOrientation" callback to animate the changes, not "willRotate..."
Related
I have a UINavigationController that contains 3 UIViewControllers on the stack.
View A - is the root
View B - is pushed by View A and has `self.navigationItem.hidesBackButton = YES;`
View C - is pushed by View B and has `self.navigationItem.hidesBackButton = NO;`
View C does not show the back button, even though I have hidesBackButton set to NO. How can I resolve this?
Update
A possible bug in 4.2 as it works till 4.1 sdks
I have tried this and mine is working perfectly. I am just posting the implementation of B view controller (BVC) and C view controller (CVC). My initial guess is that you are not setting the title of BVC in viewDidLoad.
#implementation BVC
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = #"I am B";
}
- (void) viewWillAppear:(BOOL)animated{
self.navigationItem.hidesBackButton = YES;
}
- (IBAction)pushB:(UIButton *)sender{
CVC *cvc = [[CVC alloc] initWithNibName:#"CVC" bundle:nil];
[self.navigationController pushViewController:cvc animated:YES];
[cvc release];
}
#end
#implementation CVC
- (void) viewWillAppear:(BOOL)animated{
self.navigationItem.hidesBackButton = NO;
}
#end
I think you have to set that property before you push or pop a view controller to affect the next view controller, setting it for the current viewcontroller in viewWillAppear is too late.
Edit: this looks like a bug in 4.2! The back button remains hidden both in the 4.2 simulator and on the device with 4.2, but it works in the 3.2, 4.1, and 4.0 simulators!
Here's the code where when pushing a VC with a hidden back button:
- (IBAction) goto2nd
{
SecondVC *vc = [[[SecondVC alloc] initWithNibName:#"SecondVC" bundle:nil] autorelease];
vc.navigationItem.hidesBackButton = YES;
[self.navigationController pushViewController:vc animated:YES];
}
That is all that should be needed, each VC has its own navigationItem, it's not a global setting, so you don't need to bother undoing it to restore the back button (at least when popping back to a VC where it is set to "NO").
Here's a workaround that I'm using successfully on 4.3.
Instead of hiding the back button, set the left bar button view to an empty view:
UIView *tmpView = [[UIView alloc] initWithFrame:CGRectZero];
UIBarButtonItem *tmpButtonItem = [[UIBarButtonItem alloc] initWithCustomView:tmpView];
[tmpView release];
self.navigationItem.leftBarButtonItem = tmpButtonItem;
[tmpButtonItem release];
To restore the back button, just set the left bar button item to nil:
[self.navigationItem setLeftBarButtonItem:nil animated:YES];
Update: It appears as if the bug is gone in 4.3.
Note: Even though the bug seems to be fixed, I prefer the "empty view" technique because it allows the disappearance and reappearance of the back button to be animated.
The solution for this problem is somewhat tricky..just try it it will surely work since even I faced the same problem.
First set Navigation title in viewWillAppear.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.navigationItem.title = #"SET YOUR TITLE";
}
When you are navigating to other page just set your navigation title to null.This will not show you any button on top.Since you can get rid of writing
self.navigationItem.hidesBackButton = YES; everytime.
- (IBAction)pushB:(UIButton *)sender
{
SecondVC *vc = [[[SecondVC alloc] initWithNibName:#"SecondVC" bundle:nil] autorelease];
self.navigationItem.title = #"";
[self.navigationController pushViewController:vc animated:YES];
[vc release];
}
I'm running the same issue and it's only happening on the iOS 4.2 simulator, so probably it's a bug on that version.
Reedit:
Try with this, it worked for me:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.navigationItem.hidesBackButton = NO;
}
Use the UINavigationControllerDelegate method -navigationController:willShowViewController:animated:. You will implement this in view controller A and view controller B. In A you will set -hidesBackButton: to YES and alternatively to NO in view controller B.
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
viewController.hidesBackButton = YES;
}
You can also use following sample code;
- (void) viewWillAppear:(BOOL)animated{
self.navigationItem.hidesBackButton = YES;
}
- (void) viewWillDisappear:(BOOL)animated{
self.navigationItem.hidesBackButton = NO;
}
If your view heirarchy is really such that View B should not show a back button but View C should, then the simplest way to get around this is to refactor your heirarchy. I'm thinking of the following alternative:
View A calls presentModalViewController:animated: on View B*, a UINavigationController whose view property is View B. View B* pushes View C onto its navigation stack in response to an event (or otherwise) from View B. If you need to jump back to
View A quickly then call dismissModalViewControllerAnimated: on View A. If you want to keep the state of View B* and C in memory then you could also keep another pointer to View B* somewhere so it doesn't go away when dismissed.
Hi i have a splitViewController
mapViewController = [[MapViewController alloc] initWithManagedObjectContext:managedObjectContext startingRegion:startingRegion];
distanceViewController = [[DistanceTableViewController alloc] initWithManagedObjectContext:managedObjectContext];
distanceViewController.mapViewController = mapViewController;
setupViewController = [[SetupTableViewController alloc] initWithStyle:UITableViewStyleGrouped map:mapViewController.map];
setupViewController.positionSwitch.on = savePosition;
SearchTableViewController *searchViewController = [[SearchTableViewController alloc] initWithStyle:UITableViewStylePlain managedObjectContext:managedObjectContext];
searchViewController.mapViewController = mapViewController;
tabBarController = [[UITabBarController alloc] init];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
UINavigationController *mapNavigationController = [[[UINavigationController alloc] initWithRootViewController:mapViewController] autorelease];
UINavigationController *searchNavigationController = [[[UINavigationController alloc] initWithRootViewController:searchViewController] autorelease];
UINavigationController *distanceNavigationController = [[[UINavigationController alloc] initWithRootViewController:distanceViewController] autorelease];
UINavigationController *setupNavigationController = [[[UINavigationController alloc] initWithRootViewController:setupViewController] autorelease];
UISplitViewController* splitVC = [[UISplitViewController alloc] init];
splitVC.viewControllers = [NSArray arrayWithObjects:searchNavigationController, mapNavigationController, nil];
splitVC.title = #"iMetano";
splitVC.tabBarItem = [[[UITabBarItem alloc] initWithTitle:#"Mappa" image:[UIImage imageNamed:#"mapIcon2.png"] tag:0] autorelease];
NSArray *viewControllersArray = [NSArray arrayWithObjects: splitVC,setupNavigationController,nil];
[splitVC release];
tabBarController.viewControllers = viewControllersArray;
}
When i startup my app in portrait, all works fine.
When i startup my app in landscape this is the result
I see only the view of the first viewController SearchTableViewController with some pixel between the UINavigationController and the status bar
When i rotate in portrait and after i return in landscape i see both viewController's view, but the second have some pixel between the statusBar and the UINavigationControllor
I can't understand why.
apple says not to put a split view controller inside something else, like a tab bar controller
After looking at my code and IB time after time. This is the best that I could come up with. Not sure if is the best one but it works for me. Im loading a default detail view controller. If I load the controller directly in the viewDidLoad then the problem occur. If I load it from the selector the problem goes away. I hope this helps. I have this code in the RootViewController.
- (void)viewDidLoad {
[super viewDidLoad];
[self performSelector:#selector(loadController) withObject:nil afterDelay:0];
}
-(void)loadController{
UIViewController <SubstitutableDetailViewController> *detailViewController = nil;
WebViewController *newDetailViewController = [[WebViewController alloc] initWithNibName:#"WebViewController" bundle:nil];
[newDetailViewController setTitle:#"Home"];
NewNavController <SubstitutableDetailViewController>*navController = [[NewNavController alloc] initWithRootViewController:newDetailViewController];
detailViewController = navController;
NSArray *viewControllers = [[NSArray alloc] initWithObjects:self.navigationController, detailViewController, nil];
splitViewController.viewControllers = viewControllers;
}
I had this exact same problem when attempting the combination of tab bar, split view and navigation controllers. I noticed that the alignment gap is only present when the application first fires up and the first tab is auto-selected because it's the first tab in the tab bar controller's array of view controllers. After switching tabs and then coming back to the one with the misaligned nav controller in a split view, there was no alignment problem present. So, to replicate this behavior and get rid of the misalignment when the screen is first rendered I added:
[tabBarController setSelectedViewController:splitVC];
right after setting the view controller array on the tab bar controller. Works like a champ now.
I know this is an old question, but here's the hack I just used to get around this problem for anyone who has a navigation hierarchy like mine:
UITabBarController
Tab0->UINavigationController->MGSplitViewController _or_ UISplitViewController
Tab1->UINavigationController->SomeOtherViewController
Tab2->Etc...
Nothing I tried could get rid of that 20px gap that occurs only once, at bootup, if the device orientation is anything except UIInterfaceOrientationPortrait. The 20px gap is caused by the UINavigationBar for the split view's UINavigationController above having a non-zero origin.y value; most likely, you'll find it to be 20.
Also, I found that this is only a problem if the device is running iOS < 5.0.
I check for this issue in the view controller code of my MGSplitViewController (i.e. self = an MGSplitViewController):
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
if(self.doIOS4OneTimeRotationHack == YES)
{
self.doIOS4OneTimeRotationHack = NO;
for(UINavigationController *navController in [self viewControllers])
{
if(navController.navigationBar.frame.origin.y != 0.0f)
{
[UIView animateWithDuration:0.01
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:
^(void)
{
navController.navigationBar.frame = CGRectMake(navController.navigationBar.frame.origin.x,0.0f, navController.navigationBar.frame.size.width,navController.navigationBar.frame.size.height);
}
completion:
^(BOOL finished)
{
//NSLog(#"Shifted navbar 0x%x up!",navController.navigationBar);
}];
}
}
}
}
With the animation set to finish in just 0.01 seconds, it happens so fast that you'll never even notice it as your bootup splash screen disappears and your MGSplitViewController view appears in its place. Maybe play around with it and make it instantaneous; I had to get it working and move onto my next task, so I didn't fool with it past that point.
I don't like resorting to hacks like this, but this was the only way I was able to get around this problem. ScottS' solution below sounded great, but unfortunately didn't work for me.
I think the issue here is that I'm trying to call a mediaPicker and that doesn't support other orientations...
Does anyone have a fix for this?
Here is my current code:
- (IBAction)openMediaPicker:(id)sender {
MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAnyAudio];
mediaPicker.delegate = self;
mediaPicker.allowsPickingMultipleItems = YES; // this is the default
mediaPicker.modalPresentationStyle = UIModalPresentationPageSheet;
//mediaPicker.prompt = #"Select items to play";
[self presentModalViewController:mediaPicker animated:YES];
[mediaPicker release];
// Init a Navigation Controller, using the MediaPicker as its root view controller
UINavigationController *theNavController = [[UINavigationController alloc] initWithRootViewController:mediaPicker];
[theNavController setNavigationBarHidden:YES];
// Init the Popover Controller, using the navigation controller as its root view controller
popoverController = [[UIPopoverController alloc] initWithContentViewController:theNavController];
// Make a rect at the size and location of the button I use to invoke the popover
CGRect popOverRect = chooseMusicButton.frame;
// Specify the size of the popover
CGSize MySize = CGSizeMake(520.0, 720.0);
[popoverController setPopoverContentSize:MySize animated:YES];
// Display the popover
[popoverController presentPopoverFromRect:popOverRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
popoverController.delegate = self;
}
This code is overly complicated. First you present the media picker modally, then you present it as a popover; why? In the popover, you stuff it into a navigation controller before presenting it; why? Presenting a media picker on iPad is much simpler than that:
MPMediaPickerController* picker =
[[[MPMediaPickerController alloc] init] autorelease];
picker.delegate = self;
UIPopoverController* pop =
[[UIPopoverController alloc] initWithContentViewController:picker];
self.currentPop = pop;
[pop presentPopoverFromRect:[sender bounds] inView:sender
permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
[pop release];
That works in any orientation and even survives rotation while the popover is showing.
All pre-defined modal controllers support all orientations but they must be presented from the root view controller for them to behave correctly in orientation and rotation. My guess is that that the "self" in your code is not the root view controller. You may have to re-architect the code a bit to make this happen if possible.
There are other hacks I have seen to make it work without being presented from the root view controller but they all seemed to be asking for trouble such as extending UIViewController with a category to over-ride interfaceOrientation.
If you can present it from the root view controller, it would be the simplest and cleanest but I realize it is not always possible (e.g., it is inside a library you are providing to third party apps to embed).
As shown in the screenshot below, i have a UITableView with some info and upon selecting a row an ABUnknownPersonViewController is invoked. In order to be able to able to dismiss that and go back to the UITableView I have this code:
ABUnknownPersonViewController *unknownPersonView = [[[ABUnknownPersonViewController alloc] init] autorelease];
[unknownPersonView setUnknownPersonViewDelegate:self];
[unknownPersonView setDisplayedPerson:personRecord];
[unknownPersonView setAllowsAddingToAddressBook:YES];
UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:#"Επιστροφή" style:UIBarButtonItemStylePlain
target:self action:#selector(goBackToView)];
unknownPersonView.navigationItem.title = #"Προσθήκη στις επαφές";
unknownPersonView.navigationItem.leftBarButtonItem = anotherButton;
navigationController = [[[UINavigationController alloc] initWithRootViewController:unknownPersonView] autorelease];
//navigationController = [[[UINavigationController alloc] initWithRootViewController:self] autorelease];
//self.navigationItem.rightBarButtonItem = anotherButton;
[self presentModalViewController:navigationController animated:YES];
} // didSelectRowAtIndexPath ends here
- (IBAction)goBackToView {
[self dismissModalViewControllerAnimated:YES];
}
- (void)unknownPersonViewController:(ABUnknownPersonViewController *)unknownPersonView didResolveToPerson:(ABRecordRef)person {
// CallerIDAppDelegate *delegate = (CallerIDAppDelegate *)[[UIApplication sharedApplication] delegate];
[navigationController dismissModalViewControllerAnimated:YES];
}
The problem (as you can see) is that when the ABUnknownPersonViewController is dismissed by the "Επιστροφή" button, which is "Back" actually, the view holding the tableView and the blue UIButton is moved a couple of pixels to the bottom!
Any help on what could be causing this?
Screenshot http://dl.getdropbox.com/u/1237004/problem.jpg
Debug this by checking your view's frame in -viewWillAppear, -viewDidAppear, -viewWillDisappear, and -viewDidDisappear.
Also check the view's autoresizingMask, and the parent view's autoresizesSubviews property.
I'm not sure I see the value of setting up a navigation controller here. You could just present the ABUnknownPersonViewController with [self presentModalViewController: unknownPersonView];. If you're doing it for the sake of picking up the visual navigation bar with the back button, then just add a nav bar and button to the unknown person view.
It seems like a mixed metaphor to be creating a UINavigationController but then not using its usual navigation methods (e.g., pushViewController:animated: and popViewControllerAnimated:) and instead using the modal methods inherited from UIViewController.
It seems that adding this line:
[[UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
in my viewWillAppear: made the view not to move when the modal view controller is dismissed. However now the initial position was already slightly dislocated to the bottom but fixed it by moving all the outles in IB to the top so it looks ok.
I am very new to Obj-C and learning iphone development.
My question is how to add subview from app delegate.
Lets say I added subview called "MainView" from "applicationDidFinishLaunching" method.
- (void)applicationDidFinishLaunching:(UIApplication *)application {
MainViewController *aViewController = [[MainViewController alloc] initWithNibName:#"MainView" bundle:nil];
self.mainViewController = aViewController;
[aViewController release];
[window addSubview:mainViewController.view];
// Override point for customization after application launch
[window makeKeyAndVisible];
}
"MainView.xib" file has a button to show its child view. When the button is clicked, it calls "showChildView" method.
- (IBAction)showChildView:(id)sender {
if (self.childViewController == nil) {
ChildViewController *childController = [[ChildViewController alloc] initWithNibName:#"ChildView" bundle:nil];
self.childViewController = childController;
[childController release];
}
[self.view insertSubview:childViewController.view atIndex:0];
}
From this code, when app launches, it shows "MainView" with a button. But when I clicked the button, the button is still visible as well as the content from the "ChildView.xib" file too.
How can I hide the "MainView" when I pressed the button and show only the contents of the "ChildView"?
Thanks for your help in advance.
well, you have to remove the original view first, before inserting the new subview, do it this way
- (IBAction)showChildView:(id)sender {
if (self.childViewController == nil) {
ChildViewController *childController = [[ChildViewController alloc] initWithNibName:#"ChildView" bundle:nil];
self.childViewController = childController;
[childController release];
}
[self.mainViewControlle.view removeFromSuperView];
[self.view insertSubview:childViewController.view atIndex:0];
}
Hope this helps.
You might want to check out the Utility App sample -- it demonstrates switching between two views with animation and adding/removing views from parent views.
you might want to create a navigation controller in the main view and than push the childviewcontroller onto it when invoking showChildView. You'll get the back navigation button for free that way