interfaceorientation in certain views only - iphone

I have a Main View that contatins uitableview, and I am pushing another view when the user taps on a row. I want only the child views to rotate and have written code for that. But the problem is once I push the view, it also enables the orientation on the Main View.
When I rotate the main view to the left, the statusbar also changes to the left. I have not applied any orientation on the Main View. I have done the following on the MainView but code still the status bar doesn't change.
-(void) viewDidLoad
{
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver: self selector: #selector(receivedRotate:) name: UIDeviceOrientationDidChangeNotification object: nil];
}
-(void) receivedRotate: (NSNotification*) notification
{
UIDeviceOrientation interfaceOrientation = [[UIDevice currentDevice] orientation];
if(interfaceOrientation != UIDeviceOrientationUnknown)
{
if (interfaceOrientation==UIInterfaceOrientationLandscapeLeft)
{
[self shouldAutorotateToInterfaceOrientation:interfaceOrientation];
}
}
}
How can I disable interfaceOrientation in the Main view?

in your main view controller, override this delegate:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation; // Override to allow rotation. Default returns YES only for UIDeviceOrientationPortrait
{
if((toInterfaceOrientation == UIInterfaceOrientationLandscapeRight))
return YES;
return NO;
}
Now your main view controller will always be in landscape mode.
And remove all your code which you mentioned above.
you should not call the "shouldAutorotateToInterfaceOrientation:" method.

Related

Device Orientation Changed notification event not called in other controllers other than main view controller

In my application i have 3 view controllers each is navigating by a button click. In my first view controller i have added the command
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(Orientchanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
it works only on my first UIViewController which is added in appdelegate. But it donot work for other UIViewControllers and call the selector event. What is the reason? Should I add other view controllers to appdelagate.
An example of the code in the Orientchanged: method:
- (void)Orientchanged:(NSNotification *)notification
{
UIDeviceOrientation devOrientation = [UIDevice currentDevice].orientation;
scrollWidth_L = 1024;
scrollWidth_P = 768;
}
Add these methods:
- (BOOL)shouldAutorotate {
return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAll;
}
-(void)viewWillLayoutSubviews{
[super viewWillLayoutSubviews];
UIInterfaceOrientation devOrientation = self.interfaceOrientation;
CGFloat scrollWidth_L = self.view.bounds.size.width;
CGFloat scrollWidth_P = self.view.bounds.size.height;
if (UIInterfaceOrientationLandscapeLeft == devOrientation || UIInterfaceOrientationLandscapeRight == devOrientation) {
// Code for landscape setup
} else {
// Code for portrait setup
}
}
You have added an observer for the specific viewController. You will have to add in all other viewControllers for knowing the current visible viewController orientation changed.
If you want to know globally then add observer in appDelegate.
Note : Don't forget to remove observer when not needed.
EDIT : Observer depends on where it contains. Here in your case addObserver:self , self is your first view controller.

populate entire landscape screen with new uiview upon device orientation change from portrait to landscape

So my iPhone application currently has a tabviewcontroller that populates the entire screen. The app only runs in portrait mode. My task has been to detect device orientation changes, and once it changes to landscape, have a new uiview populate the entire screen.
I already have the device orientation change detection working. I've used an NSNotificationCenter to successfully call a helper method, deviceOrientationChanged, once an orientation change is detected. IF the change was to landscape mode, I run a certain block of code.
In this block of code I have already tried various things, none of which are successful. Simply saying self.view = newViewThing; does not work because the statusbar is still present at the top and the tabs are still present at the bottom.
I have also tried adding this newViewThing as a subview to the UIWindow. This did not work because while the view was added, it was not oriented correctly.
THE QUESTION IS: is there a way to load an entirely new uiview once a device orientation change is detected? Thank you in advance.
Yes, there is a way to load a new view. I make it in my app that way:
- (void)orientationChanged:(NSNotification *)notification
{
// We must add a delay here, otherwise we'll swap in the new view
// too quickly and we'll get an animation glitch
[self performSelector:#selector(updateLandscapeView) withObject:nil afterDelay:0];
}
- (void)updateLandscapeView
{
UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView)
{
[self presentModalViewController:self.landscapeView animated:YES];
isShowingLandscapeView = YES;
}
else if (deviceOrientation == UIDeviceOrientationPortrait && isShowingLandscapeView)
{
[self dismissModalViewControllerAnimated:YES];
isShowingLandscapeView = NO;
}
}
And also I have added this code to viewDidLoad:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification object:nil];
and this code to dealloc:
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];

Trying to understand how shouldAutorotateToInterfaceOrientation and UIDeviceOrientationDidChangeNotification

I have an interface that I want to startup in landscape orientation. After startup when the user rotates the device to portrait I am displaying a day view calendar. When returning to landscape orientation the calendar is dismissed. Everything works great in every orientation with my application user interface displaying properly in landscape orientation and the calendar displaying properly in portrait orientation.
The problem is if the user is holding the iPhone in landscape orientation on startup. No matter what I do I cannot get it to startup with my user interface in landscape mode. My UIDeviceOrientationDidChangeNotification method fires twice, the first time [UIDevice currentDevice].orientation is landscape, the second in it is portrait. The end result is the the user interface rotates to portrait mode and displays the day view. Not what I want. I want the user interface to stay in landscape orientation until the user physically rotates the device from landscape to portrait.
I don't understand why it fires with a landscape [UIDevice currentDevice].orientation when the user is holding the device in portrait orientation.
Here is what my code looks like in the viewController...
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if ((interfaceOrientation == UIDeviceOrientationPortrait)|| (interfaceOrientation == UIDeviceOrientationPortraitUpsideDown)) {
return NO;
}
return YES;
}
- (void)viewDidLoad {
[super viewDidLoad];
showingCalendar = NO;
initializing=YES;
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(didRotate:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
}
-(void)didRotate:(NSNotification *)notification {
UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
if ((deviceOrientation == UIDeviceOrientationPortrait) || (deviceOrientation == UIDeviceOrientationPortraitUpsideDown)) {
if ((!showingCalendar) && (!initializing)) {
showingCalendar = YES;
[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:YES];
GCCalendarPortraitView *calendar = [[[GCCalendarPortraitView alloc] init] autorelease];
navigationController = [[UINavigationController alloc] initWithRootViewController:calendar];
[self presentModalViewController:navigationController animated:YES];
}
}else if ((deviceOrientation == UIDeviceOrientationLandscapeRight) || (deviceOrientation == UIDeviceOrientationLandscapeLeft)) {
if (showingCalendar) {
showingCalendar = NO;
if (deviceOrientation == UIDeviceOrientationLandscapeRight){
[self dismissModalViewControllerAnimated:YES];
}else if (deviceOrientation == UIDeviceOrientationLandscapeLeft){
[self dismissModalViewControllerAnimated:YES];
}
}else {
initializing = NO;
}
}
}
I found a workaround to my problem. In viewDidLoad I started a scheduledTimerWithTimeInterval and moved beginGeneratingDeviceOrientationNotifications to the selector method.
Now the notification never fires more than once. The user gets landscape at startup no matter which way the device is being held and after startup all the rotations work perfectly.
Here is my modified code. Everything else stayed the same...
- (void)viewDidLoad {
[super viewDidLoad];
showingCalendar = NO;
initializing=YES;
timer = [NSTimer scheduledTimerWithTimeInterval:.55 target:self selector:#selector(startOrientationNotifications) userInfo:nil repeats: NO];
}
-(void)startOrientationNotifications {
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(didRotate:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
}
i wouldn't generate a beginGeneratingDeviceOrientationNotifications,
a simple way could be to use a BOOL to check when portrait is allowed in
shouldAutorotateToInterfaceOrientation
something like this:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if ((interfaceOrientation == UIDeviceOrientationPortrait)|| (interfaceOrientation == UIDeviceOrientationPortraitUpsideDown)) {
return portraitIsAllowed;
}
return YES;
}
then just change it when needed in other methods .
And keep in mind that shouldAutorotateToInterfaceOrientation is called every time user rotate device AND also when you load (instantiate) your controller the first time

IOS rotate device without rotation animation

What would be the correct way to achieve an effect similar to the one in the standard iPod app of the iPhone - when the device is rotated to landscape mode, the view changes to cover flow, but the type of transition is fade and not the rotating screen?
This is how I am loading the modal view:
- (void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation)) {
carouselView.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:carouselView animated:YES];
}
}
Thanks!
Andrius
I later found that it is more stable to use this solution:
In the parent view controller (in my case it is tab view controller) viewdidload method add this:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(didRotate:) name:#"UIDeviceOrientationDidChangeNotification" object:nil];
and then add this method:
- (void) didRotate:(NSNotification *)notification {
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (UIInterfaceOrientationIsLandscape(orientation) && !self.modalViewController) {
[self presentModalViewController:carouselView animated:YES];
[Globals sharedGlobals].startedAtLandscape = YES;
}
if (UIInterfaceOrientationIsPortrait(orientation) && self.modalViewController) {
[self dismissModalViewControllerAnimated:YES];
[Globals sharedGlobals].startedAtLandscape = NO;
}
}
And finally if you want to prevent the rotation animation, modify this method like this:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if(UIInterfaceOrientationIsLandscape(interfaceOrientation)) {
return NO;
}
return YES;
}

Change View on only one Tab in Tabbar-Application (Landscape-Portrait)?

How can I change the view when rotating the iphone (change nib's).
But it should only happens in one single tab!
I tried it with:
- (void)viewDidLoad {
LandscapeViewController *viewController = [[LandscapeViewController alloc]
initWithNibName:#"LandscapeView" bundle:nil];
self.landscapeViewController = viewController;
[viewController release];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification object:nil]; }
- (void)orientationChanged:(NSNotification *)notification
{
[self performSelector:#selector(updateLandscapeView) withObject:nil afterDelay:0];
}
- (void)updateLandscapeView
{
UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView)
{
[self presentModalViewController:self.landscapeViewController animated:YES];
isShowingLandscapeView = YES;
}
else if (deviceOrientation == UIDeviceOrientationPortrait && isShowingLandscapeView)
{
[self dismissModalViewControllerAnimated:YES];
isShowingLandscapeView = NO;
}
}
But then the Landscape-View appears in all Tabs. (When this code is loaded once).
Any idea?
What's happening is your view controller is receiving the UIDeviceOrientationDidChangeNotification notification whenever the rotation changes, whether or not it is being displayed. Instead try using the built-in methods of UIViewController that are meant for responding to rotations.
http://tinyurl.com/ycb8of2
This is from Apple's Docs (View Controller Programming Guide):
Tab Bar Controllers and View Rotation
Tab bar controllers support a portrait
orientation by default and do not
rotate to a landscape orientation
unless all of the root view
controllers support such an
orientation. When a device orientation
change occurs, the tab bar controller
queries its array of view controllers.
If any one of them does not support
the orientation, the tab bar
controller does not change its
orientation.
So, I'm not sure that the Tab Bar Controller is designed to rotate just for a single view.
Tanks for your comments!
I found a workaround:
//Remove Observer if not in Landscape
- (void)viewDidDisappear:(BOOL)animated {
if (isShowingLandscapeView == NO) {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}
}
//Add Observer if not in Landscape
- (void)viewDidAppear:(BOOL)animated {
if (isShowingLandscapeView == NO) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
}
}