I have an IPad project with programmatically implemented UIPageViewController. When I turn device to landscape mode I change pageViewController's spine location to Mid in it's delegate method:
-(UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{
if (UIInterfaceOrientationIsPortrait(orientation)){
ChildViewController *viewController = (ChildViewController *)[self pageControllerAtIndex:currentPageIndex];
[pageViewController setViewControllers:#[viewController] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
return UIPageViewControllerSpineLocationMin;
} else {
ChildViewController *first = (ChildViewController *)[self pageControllerAtIndex:currentPageIndex];
ChildViewController *second = (ChildViewController *)[self pageControllerAtIndex:currentPageIndex+1];
[pageViewController setViewControllers:#[first,second] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
return UIPageViewControllerSpineLocationMid;
}
}
Then my UIPageViewController displays two pages and it looks fine until I start pagging it. The problem is: one of its child view controller (at the side where I've started flipping) takes all the space of the device screen, so another page becomes hidden below it.
In childViewController's class I found out that in the -(void)viewWillAppear method it is all good with width of the frame (I need it to be 512 - half of my screen), but in -(void)viewDidAppear method it's already 1024.
Check the autoresizing mask or layout constraint of the ChildViewController.view and make sure its size isn't affected by parent view size.
Just setting to my ChildViewController setWantsToFullScreenLayout:NO solved the problem.
Related
I have googled for a few hours with no luck, so I'm coming to you guys to save me here!
Apparently, I can't find the right information on how exactly to go about doing this (or the best way). I have an app that supports portrait and landscape (no support for upside down though). However, the portrait and landscape views are COMPLETELY different, so I'll need to use two views to represent each. Am I correct in assuming I need 3 viewcontrollers in my storyboard (the main one, and then one for portrait and one for landscape? I was going to use just two but I didn't see how to if I start with the portrait, and then need to load landscape, I would have to delete portrait, which is where my code is?
My viewcontroller has the correct constraints in place to keep the label top center, but when replacing or swapping the views programmatically, it seems the auto-resize doesn't get called. I finally fixed this by resetting the frames on the subviews, but now when the device is flipped upside down, the portrait label is forever shifted to the right. So I'd just like to know the proper way to do this, as I'm sure this can't be it.
As far as code, I have one obj-c viewcontroller class with the following modified methods...
#interface AMBViewController ()
#property (strong, nonatomic) UIViewController *portraitViewController;
#property (strong, nonatomic) UIViewController *landscapeViewController;
#end
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
UIApplication *app = [UIApplication sharedApplication];
UIInterfaceOrientation currentOrientation = app.statusBarOrientation;
[self doLayoutForOrientation:currentOrientation];
}
-(void) willAnimateRotationToInterfaceOrientation:
(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
[self doLayoutForOrientation:toInterfaceOrientation];
}
-(void) doLayoutForOrientation:(UIInterfaceOrientation)orientation {
if (UIInterfaceOrientationIsPortrait(orientation)) {
self.portraitViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"Portrait"];
if (self.landscapeViewController != nil ) {
[self.landscapeViewController.view removeFromSuperview];
self.landscapeViewController = nil;
}
self.portraitViewController.view.frame = self.view.bounds;
[self.view insertSubview:self.portraitViewController.view atIndex:0];
} else {
self.landscapeViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"Landscape"];
if (self.portraitViewController != nil ) {
[self.portraitViewController.view removeFromSuperview];
self.portraitViewController = nil;
}
self.landscapeViewController.view.frame = self.view.bounds;
[self.view insertSubview:self.landscapeViewController.view atIndex:0];
}
}
Just to be clear on my storyboard, I have one blank root controller (subclass AMBViewController) and two other view controllers "Landscape" and "Portrait"
I might also mention that the label only gets off in portrait view IF you rotate the device in a full circle (4 right or 4 left rotations). If you go right right (now it's upside down) but then left left, it's still fine. It's only when the screen flips from Right/Left Landscape to Left/Right Landscape that it messes up. Really weird, I know I must be omitting something important.
Any help is greatly appreciated. Thanks!
Solution: After finding a guide located on Apple's Dev Site (finally) I was able to come up with a solution using segues and a modal window. First view controller is portrait, second view controller is landscape, connected by a modal segue. The first view controller has the following modified methods:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_isShowingLandscapeView = NO;
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
}
-(void) orientationChanged:(NSNotification *)notification {
UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
if (UIInterfaceOrientationIsPortrait(orientation) && _isShowingLandscapeView
&& orientation != UIInterfaceOrientationPortraitUpsideDown) {
[self dismissViewControllerAnimated:NO completion:nil];
_isShowingLandscapeView = NO;
} else if (UIInterfaceOrientationIsLandscape(orientation) && !_isShowingLandscapeView ) {
[self performSegueWithIdentifier:#"ShowLandscape" sender:self];
_isShowingLandscapeView = YES;
}
}
Thanks to all who might have looked into this!
Start a new page based application project in Xcode
Run the project and turn some pages
Rotate the simulator or device
=> The page view conroller switches back to the first page (january)
How can I prevent step 4. ?
EDIT:
This happens only the first time you rotate after the app started in simulator/device.
I use most recent Xcode 4.5 with iOS 6.0 Simulator and iOS 6 on my testing device.
The same thing happens when I download some other sample code from blogs / etc. Maybe an iOS 6 bug?
EDIT2:
I found out that the first page view that is passed to the UIPageViewController is not dealloced until first rotation. This really looks like a bug to me.
(UPDATE FROM 2014: This seems to have been fixed in iOS7, if you start again from a new Page View application template.)
I've experienced this bug as well. It seems to kick in any time after the main view reappears. My app has several full-screen modals in it, and after those go away the same behaviour occurs.
This happens in XCode 4.5.1 and iOS6 - I 'fixed' this by re-downloading XCode 4.4 and reverting my app back to iOS5.1. Obviously not a great long-term solution. I filed this in Radar and got a note back that it was already logged.
FWIW I noticed that iBooks had this same bug in it right after iOS6 came out, but they seem to have fixed it in a recent update.
Here's how I managed to fix this problem in my app. I'm afraid it's kind of a hacky solution, but it's a quirky bug.
Context: My app is a diary (it's called Remembary) and each page is a different day's diary entry. I have a singleton class called "AppContext" that keeps track of various app-level values, such as the currently showing diary entry object, the current date, and the like. Each day's dataViewController also keeps track of its own diary entry.
The trickiest part was finding a context where I could catch that the app was showing the wrong page. It turns out that this is in [RootViewController viewDidLayoutSubviews], so I added the following to that method:
// get the currently displaying page
DataViewController *currentPage = self.pageViewController.viewControllers[0];
// check if we're showing the wrong page
if ([currentPage myEntry] != [AppContext getCurrentEntry]) {
// jump to the proper page (the delay is needed to ensure that the rotation has fully completed)
[self performSelector:#selector(forceJumpToDate:)
withObject:[AppContext getCurrentEntryDate]
afterDelay:0.5];
}
Here's the forceJumpToDate function, which basically gets a new page based on the current date and tells the pageViewController to jump to it without animating:
- (void) forceJumpToDate:(NSDate *)targetDate {
DataViewController *targetPage = [self.modelController viewControllerForDate:targetDate
storyboard:self.storyboard];
NSArray *viewControllers = [NSArray arrayWithObject:targetPage];
[self.pageViewController setViewControllers:viewControllers
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:NULL];
}
The user might notice a brief hiccup on the screen as the new page is forced into place, but this only happens if they would otherwise be getting the wrong page, so it's still an improvement.
This was seriously interfering with my ability to upgrade my app to iOS6, so I'm glad I finally figured it out.
Here is my solution:
// RootViewController.m
#import "RootViewController.h"
#import "ModelController.h"
#import "DataViewController.h"
#interface RootViewController ()
#property (readonly, strong, nonatomic) ModelController *modelController;
//added
#property (strong, nonatomic) DataViewController *currentViewController;
#end
#implementation RootViewController
#synthesize modelController = _modelController;
//added
#synthesize currentViewController = _currentViewController;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Configure the page view controller and add it as a child view controller.
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageViewController.delegate = self;
DataViewController *startingViewController = [self.modelController viewControllerAtIndex:0 storyboard:self.storyboard];
NSArray *viewControllers = #[startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:NULL];
self.pageViewController.dataSource = self.modelController;
[self addChildViewController:self.pageViewController];
[self.view addSubview:self.pageViewController.view];
// Set the page view controller's bounds using an inset rect so that self's view is visible around the edges of the pages.
CGRect pageViewRect = self.view.bounds;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
pageViewRect = CGRectInset(pageViewRect, 40.0, 40.0);
}
self.pageViewController.view.frame = pageViewRect;
[self.pageViewController didMoveToParentViewController:self];
// Add the page view controller's gesture recognizers to the book view controller's view so that the gestures are started more easily.
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
//added
self.currentViewController = self.pageViewController.viewControllers[0];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (ModelController *)modelController
{
// Return the model controller object, creating it if necessary.
// In more complex implementations, the model controller may be passed to the view controller.
if (!_modelController) {
_modelController = [[ModelController alloc] init];
}
return _modelController;
}
#pragma mark - UIPageViewController delegate methods
/*
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
}
*/
//added
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
self.currentViewController = self.pageViewController.viewControllers[0];
}
- (DataViewController *)currentViewController
{
if (!_currentViewController) _currentViewController = [[DataViewController alloc] init];
return _currentViewController;
}
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
if (UIInterfaceOrientationIsPortrait(orientation) || ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)) {
// In portrait orientation or on iPhone: Set the spine position to "min" and the page view controller's view controllers array to contain just one view controller. Setting the spine position to 'UIPageViewControllerSpineLocationMid' in landscape orientation sets the doubleSided property to YES, so set it to NO here.
//deleted: UIViewController *currentViewController = self.pageViewController.viewControllers[0];
//changed to self.currentViewController
NSArray *viewControllers = #[self.currentViewController];
[self.pageViewController setViewControllers:viewControllers
direction:UIPageViewControllerNavigationDirectionForward
animated:YES
completion:NULL];
self.pageViewController.doubleSided = NO;
return UIPageViewControllerSpineLocationMin;
}
// In landscape orientation: Set set the spine location to "mid" and the page view controller's view controllers array to contain two view controllers. If the current page is even, set it to contain the current and next view controllers; if it is odd, set the array to contain the previous and current view controllers.
// deleted: DataViewController *currentViewController = self.pageViewController.viewControllers[0];
//deleted: NSArray *viewControllers = nil;
//added
NSArray *viewControllers = #[self.currentViewController];
//changed currentViewController to self.currentViewController
NSUInteger indexOfCurrentViewController = [self.modelController indexOfViewController:self.currentViewController];
if (indexOfCurrentViewController == 0 || indexOfCurrentViewController % 2 == 0) {
UIViewController *nextViewController = [self.modelController pageViewController:self.pageViewController viewControllerAfterViewController:self.currentViewController];
viewControllers = #[self.currentViewController, nextViewController];
} else {
UIViewController *previousViewController = [self.modelController pageViewController:self.pageViewController viewControllerBeforeViewController:self.currentViewController];
viewControllers = #[previousViewController, self.currentViewController];
}
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
return UIPageViewControllerSpineLocationMid;
}
#end
What is it you want to prevent? Do you want to prevent rotation? If that is what you want, modify the shouldAutorotateToInterfaceOrientation return value in the RootViewController.m implementation file.
When I did this, the App was able to keep the same page (month) even after rotating the device. I used the simulator and tried on both iPhone and iPad. On the iPad, in landscape mode, it showed two months at a time, but then when rotated back to portrait, still kept the first of the two months that was displayed. This was when I incremented to June. I used the default project without changing a line of code.
Today I found out that in my app I could just use the following to remove the bug (but I have no clue why).
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
...
self.pageViewController.view.hidden = YES;
}
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
self.pageViewController.view.hidden = NO;
}
Major head-scratcher all day on this one :-(
I have an instance of a UIPageViewController that does not appear to be firing the delegate method:
-(UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
I have tried various methods of displaying the UIPageViewController and have settled on a programatic approach (as opposed to a Storyboard one) that appears to be working correctly, with one exception... when rotating the iPad to landscape the spine does not appear mid-point as expected. I simply cannot find out why the delegate method does not get called.
Code Explanation (simplified for example)
Consider three classes as follows:
RootViewController - loaded when the app starts
PageViewController - loaded by RootViewController upon user initiation
PageContentViewController - loaded by PageViewController when pages are needed
Fairly self-explanatory. The RootViewController is loaded by the app upon launch. When the user taps an image within this view controller's view (think magazine cover opening a magazine) it launches the PageViewController as follows:
PageViewController *pvc = [[PageViewController alloc] initWithNibName:#"PageView"
bundle:[NSBundle mainBundle]];
pvc.view.frame = self.view.bounds;
[self.view addSubview:pvc.view];
In the actual app there is animation etc to make the transition all nice, but essentially the PageViewController's view is loaded and takes fullscreen.
PageViewController
This is the workhorse (only relevant methods shown). I have tried various examples from the infinite world of Google and written directly from the Apple docs...
#interface PageViewController : UIViewController <UIPageViewControllerDelegate, UIPageViewControllerDataSource>
#property (nonatomic, strong) UIPageViewController *pageViewController;
#property (nonatomic, strong) NSMutableArray *modelArray;
#end
#implementation TXCategoryController
-(void)viewDidLoad
{
[super viewDidLoad];
// Simple model for demo
self.modelArray = [NSMutableArray alloc] init];
for (int i=1; i<=20; i++)
[self.modelArray addObject:[NSString stringWithFormat:#"Page: %d", i]];
self.pageViewController = [[UIPageViewController alloc]
initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageViewController.delegate = self;
self.pageViewController.dataSource = self;
PageContentViewController *startupVC = [[PageContentViewController alloc] initWithNibName:#"PageContent" bundle:nil];
startupVC.pageLabel = [self.modelArray objectAtIndex:0];
[self.pageViewController setViewControllers:[NSArray arrayWithObject:startupVC]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
[self addChildViewController:self.pageViewController];
[self.view addSubview:self.pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
self.pageViewController.view.frame = self.view.bounds;
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerBeforeViewController:(UIViewController *)viewController
{
// Relevant code to add another view...
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerAfterViewController:(UIViewController *)viewController
{
// Relevant code to add another view...
}
-(UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
// Setting a break point in here - never gets called
if (UIInterfaceOrientationIsPortrait(orientation))
{
// Relevant code to create view...
return UIPageViewControllerSpineLocationMin;
}
// Relevant code to create 2 views for side-by-side display and
// set those views using self.pageViewController setViewControllers:
return UIPageViewControllerSpineLocationMid
}
#end
This all works perfectly well as I mentioned earlier. The PageViewController's view gets shown. I can swipe pages left and right in both portrait and landscape and the respective page number appears. However, I don't ever see two pages side-by-side in landscape view. Setting a breakpoint in the spineLocationForInterfaceOrientation delegate method never gets called.
This is such a head-scratcher I have burned out of ideas on how to debug/solve the problem. It almost behaves like the UIPageViewController isn't responding to the orientation changes of the device and therefore isn't firing off the delegate method. However, the view gets resized correctly (but that could be just the UIView autoresizing masks handling that change).
If I create a brand new project with just this code (and appropriate XIb's etc) it works perfectly fine. So something somewhere in my actual project is causing this. I have no idea where to continue looking.
As usual, any and all help would be very much appreciated.
Side Note
I wanted to add the tag 'uipageviewcontrollerspinelocation' but couldn't because it was too long and I didn't have enough reputation (1500 required). I think this is a devious ploy on Apple's part to avoid certain tags in Stackoverflow... ;-)
Finally found the problem. It was something of a red herring in its symptoms, but related just the same.
Putting a break point in the shouldAutorotateToInterfaceOrientation: method was a natural test to see if the UIViewController was even getting a rotation notification. It wasn't which led me to Apple's technical Q&A on the issue: http://developer.apple.com/library/ios/#qa/qa1688/_index.html
The most relevant point in there was:
The view controller's UIView property is embedded inside UIWindow but alongside an additional view controller.
Unfortunately, Apple, in its traditional documentation style, doesn't provide an answer, merely confirmation of the problem. But an answer on Stack Overflow yielded the next clue:
Animate change of view controllers without using navigation controller stack, subviews or modal controllers?
Although my RootViewController was loading the PageViewController, I was doing it as a subview to the main view. This meant I had two UIViewController's in which only the parent would respond to changes.
The solution to get the PageViewController to listen to the orientation changes (thus triggering the associated spine delegate method) was to remove addSubview: and instead present the view controller from RootViewController:
[self presentViewController:pac animated:YES completion:NULL];
Once that was done, the orientation changes were being picked up and the PageViewController was firing the delegate method for spine position. Only one minor detail to consider. If the view was launched in landscape, the view was still displaying portrait until rotated to portrait and back to landscape.
That was easily tweaked by editing viewDidLoad as follows:
PageContentViewController *page1 = [[PageContentViewController alloc] initWithNibName:#"PageContent" bundle:nil];
NSDictionary *pageViewOptions = nil;
NSMutableArray *pagesArray = [NSMutableArray array];
if (IS_IPAD && UIInterfaceOrientationIsLandscape(self.interfaceOrientation))
{
pageViewOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:UIPageViewControllerSpineLocationMid]
forKey:UIPageViewControllerOptionSpineLocationKey];
PageContentViewController *page2 = [[PageContentViewController alloc] initWithNibName:#"PageContent" bundle:nil];
[pagesArray addObject:page1];
[pagesArray addObject:page2];
}
else
{
[pagesArray addObject:page1];
}
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
options:pageViewOptions];
self.pageViewController.delegate = self;
[self.pageViewController setViewControllers:pagesArray
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:NULL];
Job done and problem solved.
I am facing problem updating UIView asynchronously with device orientation in place. I have implemented device orientation in viewDidload as below
- (void)viewDidLoad{
[super viewDidLoad];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged) name:UIDeviceOrientationDidChangeNotification object:nil];
[self initialize];}
In orientationChanged method, I have following code
-(void)orientationChanged {
UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
if(UIInterfaceOrientationIsLandscape(orientation)){
UINib *nib = [UINib nibWithNibName:#"ConsoleViewControllerLandscape" bundle:nil];
UIView *portraitView = [[nib instantiateWithOwner:self options:nil] objectAtIndex:0];
self.view = portraitView;
[self initialize];
} else {
UINib *nib = [UINib nibWithNibName:#"ConsoleViewController" bundle:nil];
UIView *portraitView = [[nib instantiateWithOwner:self options:nil] objectAtIndex:0];
self.view = portraitView;
[self initialize];
}
In initialize method, I actually update UI asynchronously with codes like
[self performSelectorOnMainThread:#selector(arrangeAsynchronously) withObject:nil waitUntilDone:NO];
- (void) arrangeAsynchronously{
//Some complex calculation and finally
[self.view addSubview:imageview];
}
The problem is when orientation changed imageViews are not added to main view. Lets say I am starting with portrait view then I can see all imageviews in portrait view and if it changed to landscape, then view is blank. Again if I switched to portrait, then all subviews i.e. imageViews are properly added. The problem is when orientation changed, I am loading a new nib file however the code still refers to old view loaded from old nob file. How can I change reference. This problem only occurs when I do in asynchronous mode.
Its not problem with uiview rather its with calculation of subview positions after device rotation. Earlier my code was
CGAffineTransform inverseTransform = CGAffineTransformInvert(self.view.transform);
fixedPoint = CGPointApplyAffineTransform(fixedPoint,inverseTransform);
fixedPoint = CGPointMake(fixedPoint.x+126, fixedPoint.y-109);
And I changed it to
fixedPoint = CGPointMake(fixedPoint.x+126, fixedPoint.y-109);
But still I am clueless why affinetransform does not work waitUntilDone:NO and works in waitUntilDone:YES.
Your strategy is a bit problematic. self.view is presented somehow, and just because you make a new UIView, doesn't mean it's get replaced in the presented window.
I suggest that you have a container view added to your main UIView (the one you replace here), and then change the content of the container view when device orientation is changed.
EDIT
My answer might seem a bit unclear so let me try to explain it more detailed.
the UIView of a UIViewController is presented by a UIWindow. It means that the window has a reference to the view. When you change the UIView of a UIViewController (by constructing a new UIView) it does NOT mean that it will reflect in the UIWindow.
Initial scenario:
UIViewController->UIView1<-UIWindow
After you construct a new UIView:
UIViewController->UIView2
UIWindow->UIView1
As you can see on the above figure, you don't gen any errors, but you now have two views, and changes made in your UIViewController does not reflect on the screen.
You might be so lucky that it works the first time however: If you reconstruct the UIView BEFORE it is presented by the UIWindow everything still works, but it is still a bad design, that might easily break (like you are seeing after the timing is changed).
This is the case where things might actually work:
Initial scenario:
*UIViewController->UIView1
After you construct a new UIView:
*UIViewController->UIView2
the window present the view on screen:
UIViewController->UIView2<-UIWindow
Basically you should NEVER throw away your handle to the UIView of a UIViewController after it has been presented.
I hope this helps on your understanding of how referencing/pointers works.
I have the following question:
I got some code that gets called when an user logs in. The code has to call another view controller and has to show another view. To show to new view, i got the following code:
[scrollView removeFromSuperview];
Form1 *formcontroller1 = [[Form1 alloc] initWithNibName:#"Form1" bundle:[NSBundle mainBundle]];
[self.view setAutoresizesSubviews:YES];
[self.view addSubview:formcontroller1.view];
[scrollView release];
The problem is, when the other view is loaded and i rotate the device, the view of the new nib is not resizing correctly.
EDIT:
I wasn't dismissing the current viewcontroller so some properties remained. What i did is this:
[scrollView removeFromSuperview];
[self dismissModalViewControllerAnimated:YES];
Form1 *formcontroller = [[Form1 alloc] init];
[self presentModalViewController:formcontroller animated:YES];
[scrollView release];
You should check the autoresizing properties of your nib view in Interface Builder...
It should look like in the picture:
The middle arrows are dimmed, but still active. This is where autoresizing is set. You could try and set that property programmatically by assigning in your controller viewDidLoad method:
self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
You should also ensure that both your view and its superviewhave the "autoresize subviews" button checked (in the first pane of the inspector in IB)
OLD ANSWER:
How is Form1 – shouldAutorotateToInterfaceOrientation: defined?
By default, this method returns YES for the UIInterfaceOrientationPortrait orientation only. If your view controller supports additional orientations, override this method and return YES for all orientations it supports.
Your implementation of this method should simply return YES or NO based on the value in the interfaceOrientation parameter. Do not attempt to get the value of the interfaceOrientation property or check the orientation value reported by the UIDevice class. Your view controller is either capable of supporting a given orientation or it is not.
E.g.:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
to support all orientations.