Determine UIInterfaceOrientation on iPad - iphone

I don't need to specify the orientation in this case, I just need to detect it, but I'm having trouble. I have conditional code that should only work in portrait, and if the device is in landscape I need to do something else. Since the deviceOrientation is not necessarily the same as the interfaceOrientation, I can't come up with a way to test for portrait mode.
Most tutorials I find on Google are ways to force landscape or do some sort of rotation. The only thing I want to do is just determine what the orientation is. Here is my code, which is not working:
-(void)viewDidLoad {
[super viewDidLoad];
//currentOrientation is declared as UIInterfaceOrientation currentOrientation
currentOrientation = [[UIApplication sharedApplication] statusBarOrientation];
NSLog(#"%#",currentOrientation); // == NULL
}
I need to determine the value of the interfaceOrientation and program conditionally. Thanks for your help!

Are you aware of the interfaceOrientation property of the UIViewController class?
- (void) viewDidLoad {
[super viewDidLoad];
BOOL isPortrait = UIDeviceOrientationIsPortrait(self.interfaceOrientation);
// now do whatever you need
}
Or are you after [[UIDevice currentDevice] orientation]?

Especially at launch I have found the following to be always accurate for the UI, regardless of what the UIDevice says the orientation is.
[UIApplication sharedApplication].statusBarOrientation

self.interfaceOrientation is unreliable in certain situations. For example, re-arranging tabs in a tabbar application returns incorrect value.
However [UIApplication sharedApplication].statusBarOrientation is always reliable. You saved me a lot of time slycrel. Thank you.

UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if ((orientation == UIInterfaceOrientationLandscapeLeft)
|| (orientation == UIInterfaceOrientationLandscapeRight) )
{
//Landscape
}
else
{
//Portrait
}

I know it is a very old post. How ever I would like to add a point to say it is better to check status bar orientation is better. When ever you call self.interfaceorientation it is calling shouldRotateToOrientation every time. If you have written some code in that method it will be executed. So be cautious!.

UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
UIInterfaceOrientation statusBarOrientation = [UIApplication sharedApplication].statusBarOrientation;
if(deviceOrientation == UIDeviceOrientationFaceUp || deviceOrientation == UIDeviceOrientationFaceDown){
if(debug){
NSLog(#"Nothing to change because it is gone to Flat");
}
return;
}
if(deviceOrientation !=statusBarOrientation){
if(debug){
NSLog(#"\nApple has a bug?:\n UIDeviceOrientation : %d, UIInterfaceOrientation: %d",deviceOrientation, statusBarOrientation );
}
}
You won't believe me until you will see at the console the second output!
Some situations - and they exists! - is displayed the last NSLog content!
Than you have to do some workarounds to go on that way, where iOS has no bug, good luck for everyone!
Ah that ... forum moderator maybe will delete this post too, because this doesn't meant to be and answer in his opinion!
I hope it helps for somebody once, it happens on iphone too...(there I got)

Mix it up a little:
BOOL isLandscape = self.view.frame.size.width > self.view.frame.size.height;
(edit) Obviously the previous answers are the correct way to do this and this solution would fail in a situation where view controllers are not full-screen.

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{</br>
if (UIDeviceOrientationIsLandscape(toInterfaceOrientation)) {</br>
some instructions;
} else {
some instructions;
}
}
This is a snippet from one of my programs.
You could of course use the if statement in your ViewDidLoad notification as well.

I already voted up the answer by #slycrel, but I would like to take the time to write this, and point some things out that seems to be lost in this old question, and lots of other questions on the subject.
It's true that Apple does not really want us to update most of our UI based on orientation changes, but it is still totally possible and sometimes necessary on a case by case scenario, and it will be that way until Apple improves their new(ish) APIs (e.g. viewWillTransitionToFrame: would be way more useful than viewWillTransitionToSize:. Just sayin')
Why I voted up the answer by #slycrel is related to what you need to keep in mind as the logical difference between UIDeviceOrientation and UIInterfaceOrientation.
Tthe status bar is what denotes an application's currently known UIInterfaceOrientation. All this stuff about FaceUp, FaceDown is only related to a device's orientation, not necessarily your application's. An application does not support device orientations anyway. Really, UIDeviceOrientation can be ignored completely if all you have to do is make sure you layout and animate things appropriately in your interface, which is 99% of an application developer's use cases. This is currently achieved with the status bar's UIInterfaceOrientation from #slycrel's answer:
[UIApplication sharedApplication].statusBarOrientation
It should be noted, the readwrite version of this property is deprecated, the readonly version is not.
Take this example:
I have an application that supports ALL interfaces orientations, and a root view controller that supports them as well.
Now, I am presenting a UIViewController that will result in the status bar orientation to become landscape.
Which landscape orientation (left or right) it goes to is based on what is returned by preferredInterfaceOrientationForPresentation for that view controller, what the current device orientation is, and what interface orientations the view controller supports (see next point).
The status bar will go to landscape, regardless of what the current device orientation is, because this view controller only supports landscape based on what is returned by supportedInterfaceOrientations. Lets say we support both landscape left and right with UIInterfaceOrientationMaskLandscape.
I also want to conditionally animate this view controller into position with a rotation transform. This will only be necessary when going from portrait or portrait upside down, to landscape left or landscape right. Otherwise it will be a more simple presentation animation without rotation.
Then, after some time and device use, I dismiss that view controller.
Now I want to conditionally animate this view controller off the screen with another rotation transform. This will only be necessary when going from landscape left or landscape right, to portrait or portrait upside down. Otherwise it will be a more simple dismissal animation without rotation.
At this point, the status bar's orientation will become whatever the system decides is appropriate for the combination of your root view controller's preferred interface orientation and supported interface orientations, as well as the device's current UIDeviceOrientation.
Since the view controller we are going to supports ALL interface orientations, if your device's orientation is FaceUp or FaceDown, you can not reliably guess the next UIInterfaceOrientation based on UIDeviceOrientation, and you do not have to anyway.
So... status bar orientation to the rescue!
The previous example is possible, because the status bar orientation is not updated when a view controller transition is about to start (the system asks a transition delegate for an animator, etc.). Then it is updated when the transition starts animating (e.g. by the time animationTransition: is called). This way you should have a good comparison just using the initial and current values of the status bar's UIInterfaceOrientation.
Even without using view controller transitions, it should still be safe to update views based on the status bar orientation.
Keep in mind, if you are manually updating the status bar, and if you are not using "View controller-based status bar appearance" in your Info.plist, then your application's logic must be aware when the status bar will and did change orientation. You will probably be looking for a couple NSNotification names for these cases, which are:
UIApplicationWillChangeStatusBarOrientationNotification
UIApplicationDidChangeStatusBarOrientationNotification
As well as these UIApplicationDelegate methods:
- (void)application:(UIApplication *)application willChangeStatusBarOrientation:(UIInterfaceOrientation)newStatusBarOrientation duration:(NSTimeInterval)duration;
- (void)application:(UIApplication *)application didChangeStatusBarOrientation:(UIInterfaceOrientation)oldStatusBarOrientation;
- (UIInterfaceOrientationMask)supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window
And this other helpful UIApplication property:
#property(nonatomic,readonly) NSTimeInterval statusBarOrientationAnimationDuration;

As of iOS8, APIs have been deprecated or return unhelpful results such as .FaceUp .FaceDown
This is because Apple does NOT want you to update your UI using orientation, but rather by using size classes, constraints, and proportion (using n% of superview).
Indeed, orientation dependent code might fail to provide good results across the whole range of device and use case (especially multitasking)

Related

Device orientation - change in legal way (iOS 4.0+)

My app has navigation bar, where 1st screen returns YES to orientation, the second one is set to some orientation basing on what user choose in 1st screen. After going back to 1st screen from 2nd one, if user had device in hand in portrait but interface was in landscape, 1st screen is set to landscape. This happens because of
(BOOL)shouldAutorotateToInterfaceOrientation(UIInterfaceOrientation)interfaceOrientation
Is called only after changing device orientation.
I want to check what is device orientation atm and set interface orientation to this one.
Tried:
//1st method:
UIViewController *rotateTheScreen = [[UIViewController alloc]init];
[self presentModalViewController:rotateTheScreen animated:NO];
[self dismissModalViewControllerAnimated:NO];
[rotateTheScreen release];
//2nd method:
UIInterfaceOrientation interfaceOrientation = self.interfaceOrientation;
//3rd method:
UIInterfaceOrientation orientation = [[UIDevice currentDevice] orientation];
1st is acting strange, rotates all cases besides coming back from interface orientation = landscape and device orientation = landscape (here is a bug, he rotates to landscape)
2nd checks interface, like the name tells, and tho doesnt work for my problem
3rd as far as i heard is private and Apple rejects apps using this.
Take a look at this thread.
Basically, there's no way to force a device orientation and get your application approved by Apple.
Shortly, the method exists but is an undocumented method of the UIDevice class.
[[UIDevice currentDevice] setOrientation: UIInterfaceOrientationLandscapeRight animated:YES];
This gives a compiler warning that you can get rid of with a category.
#interface UIDevice (MyAwesomeMethodsThatAppleWillNeverAllowMeToUse)
-(void)setOrientation:(UIInterfaceOrientation)orientation animated:(BOOL)animated;
-(void)setOrientation:(UIInterfaceOrientation)orientation;
#end
Also, some say that you can call these methods indirectly using performSelector to get around Apple's static code analysis, as you can read in the comments here.
as I know there are no legal way. If I wrong, please, correct me somebody!
change the 'Initial interface orientation' in your project plist file

iOS how to stop view rotate

I want my iPad app to stop rotation as you rotate the iPad. I want to stop rotate every view.
Any ideas help?
if you want stop rotation for whole app then simply in app info.plist file changed Supported interface orientations ,Initial interface orientation property to portrait or landscape depends on you
In iOS6 shouldAutorotateToInterfaceOrientation has be deprecated. Override both supportedInterfaceOrientations and preferredInterfaceOrientationForPresentation instead.
Please see
Just check the auto-resizing property of your view controller.
(Fixed syntax error)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if(interfaceOrientation == UIInterfaceOrientationPortrait)
return YES;
return NO;
}
In My Project's info.plist I have deleted some key on the iPad Supported interface orientations like the following image (I have only given support for the portrait orientation)
The main idea of global controllable rotation lock is to write UIViewController category containing lock mechanism for every view controller.
You simply need to modify supportedInterfaceOrientations method globally
- (NSUInteger)supportedInterfaceOrientations
{
return __orientation;
}
Here __orientation is the static variable which can be set via category method.
The full realization of the category is presented here
Please update your projectname.plist like this. Supported interface orientations have only one object "Portrait (bottom home button)"
I strongly advise against stop rotation on iPad because supporting rotation is a must on the iPad. This is because the iPad does not have a normal way in which it will be held unlike the iPhone, which is normally held in portrait view (AKA Vertical). So you have to leave the choice to the user to eventually lock the orientation
The HIG do not actually state this as a requirement, but as a recommendation but there are many app that was rejected by this issue.
By the way if you want to this for a limit number of view controller you should implement:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if(interfaceOrientation == UIInterfaceOrientationPortrait){
return YES;
}
}

Get launch orientation of iPad app

In my iPad app, I need to run some layout code to set the proper layout depending on the orientation. By default, the layout is configured for the landscape orientation, so in the case that the app starts in portrait mode, I need to take extra action to configure the views properly for display in portrait.
In my -application:didFinishLaunchingWithOptions: method, I check the orientation using [[UIDevice currentDevice] orientation]. The problem here is that it always returns portrait even if the app is starting in landscape. Is there any way around this?
This is expected behavior. Quoth the UIViewController documentation:
Note: At launch time, applications should always set up their interface in a portrait orientation. After the application:didFinishLaunchingWithOptions: method returns, the application uses the view controller rotation mechanism described above to rotate the views to the appropriate orientation prior to showing the window.
In other words, as far as the device is concerned the orientation is portrait while the application is launching. At some point after application:didFinishLaunchingWithOptions: it will detect the different orientation and call your shouldAutorotateToInterfaceOrientation: method and then your other view rotation methods, which you should handle as normal.
This is the best way to check for orientation on launch. First, create a new method in your AppDelegate that checks the orientation:
-(void)checkLaunchOrientation:(id)sender{
UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
BOOL isLandscape = UIDeviceOrientationIsLandscape(self.viewController.interfaceOrientation);
if (UIInterfaceOrientationIsLandscape(orientation) || isLandscape) {
//do stuff here
}
}
At the end of -application:didFinishLaunchingWithOptions: run
[self performSelectorOnMainThread:#selector(checkLaunchOrientation:) withObject:nil waitUntilDone:NO];
Use self.interfaceOrientation in your view controller - it's a property of UIViewController that is set by iOS for you, and in some cases is more reliable than [[UIDevice currentDevice] orientation].
Here's a detailed description: http://bynomial.com/blog/?p=25
As mentioned in a blog post above, there is a set of macros for testing orientation. That blog post however mentions UIDeviceOrientationIsPortrait. I like the following below, it's a minor twist.
if(UIInterfaceOrientationIsPortrait(self.interfaceOrientation))
{
NSLog(#"Portrait");
}
else
{
NSLog(#"Landscape");
}
An observation I've made is that you can't call this code in a table view, pushed on to a Navigation Controller embedded in the split view controller. So in other words you can't call it from the master view controller. You have to replace the "self.interfaceOrientation" with splitviewcontroller.interfaceOrientation, assuming you maintain a reference to the parent split view controller.
Use the status bar orientation instead to detect it.
UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
then perform the if's on the "orientation" you have obtained from above.
So the question is about checking orientation at startup. The answer is sadly "You can't".
But AFTER startup, you can check orientation the normal way (as others have described).
If anyone else comes here looking for an answer, simply stop looking since, at startup the orientation variable is not set (all views frames/bounds also report being in portrait even if they aren't).
You want to make sure you set the proper keys in your Info.plist to allow for the orientations you want:
UISupportedInterfaceOrientations
UIInterfaceOrientationPortrait
UIInterfaceOrientationPortraitUpsideDown
UIInterfaceOrientationLandscapeLeft
UIInterfaceOrientationLandscapeRight
Not that you need another answer, but I thought I should add that you almost never want to use [[UIDevice currentDevice] orientation]. That method returns the orientation of the device, which isn't necessarily the same as the orientation of the interface.
It's not true that you can't figure out the launch orientation, it is true that it's a pain in the rear to do so.
here's what you need to do.
your first UIViewController needs to have some special logic to nab the information you'd like.
you might even want to create a UIStartupController just for these purposes if it's that important to your flow.
in the case of my project, we already had such a startup controller present.
all you need is the following code
-(id) initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.launchOrientation = UIDeviceOrientationUnknown;
}
return self;
}
-(void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
duration:(NSTimeInterval)duration
{
[super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
if (self.launchOrientation == UIDeviceOrientationUnknown && duration > 0)
self.launchOrientation = UIInterfaceOrientationPortrait;
else
self.launchOrientation = toInterfaceOrientation;
}
basically, if we're not launching in UIInterfaceOrientationPortrait, the first rotation callback sequence will actually reveal the launch orientation.
if launched in UIInterfaceOrientationPortrait, then we need to check that the first rotation's duration is non zero, and then we know that it was launched from portrait.

iPhone SDK: Forcing landscape mode for a single part of an app

Yet another landscape mode question.
We've all seen the
[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];
Nonsense. I have not been able to get this to work on the simulator or on the device.
What I get is this:
http://i47.tinypic.com/zl9egh.png
when I really want this:
http://i45.tinypic.com/xms6cm.png
As you might be able to tell, it's flipping the phone but it's not realizing it has been flipped.
I've seen the hidden method
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];
But I need this app to be on the app store, and I don't know if they will crack down on that.
Does anyone have any idea on how to get this damn thing to straighten itself out?
Ideally your view controller should implement:
- (BOOL)shouldAutorotateToInterfaceOrientation:
(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft ||
interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
Then the only allowed orientation for that view controller is one of the landscape orientations.
Unless you have a pretty complex view hierarchy that utilizes a tab bar controller, this should cause the view to rotate when it's pushed.
If it doesn't work you can try:
[[UIDevice currentDevice] performSelector:
#selector(setOrientation:)
withObject:(id)UIInterfaceOrientationLandscapeRight];
I have an app in the AppStore that uses this code because in my case I do have a complex hierarchy of views that keeps the one I need to be landscape only from working.
If you want to rotate a single part of the app you can use the CGAffineTransform transform property of a UIView. For an example check this thread:
How do I apply a perspective transform to a UIView?

How do you handle Portrait and Landscape Views?

I understand you can specify a landscape, for the entire application but what if it's partially in landscape and partially in portrait.
Currently I have some views that are basically Images. These images have been rotated so that the user knows certain sections of the application are going to be in Landscape mode. All my UILabels are also rotated to give this effect as well.
My question is, is there a better way to handle this. Is there a way to set the orientation programmatically at run time? In which case I would no longer need to rotate my images/uilabels.
Just to clarify, I do not need auto rotation functionality, the way that it is being implemented now is captures all the functionality I want to include in the app but I just wanted to know if there is a less cumbersome way of handling landscape/portrait views within the same application.
You can force rotation at any time by calling;
UIApplication *application = [UIApplication sharedApplication];
[application setStatusBarOrientation: UIInterfaceOrientationWHATEVER animated:NO];
My current application is primarily landscape, but has a few portrait views. In the view controllers corresponding to views the user should be able to rotate, I am allowing the rotation but preventing animation. This gives you a switch to another view in your NIB, without any weird slide-off-the-screen screwyness that normally happens is you pile on a view during the animation.
Hopefully you find this helpful!
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if (interfaceOrientation == UIInterfaceOrientationPortrait) {
rotatingToPortrait = YES;
[UIView setAnimationsEnabled:NO];
return YES;
} else if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
rotatingToPortrait = NO;
[UIView setAnimationsEnabled:NO];
return YES;
}
// Catch upside-down
return NO; }
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
[UIView setAnimationsEnabled:YES];
if (rotatingToPortrait) {
// Swap in portrait view here
} else {
// Swap it out here
} }
Currently I do not know of any way to control orientation programatically. Meaning there is no way to tell the device "rotate to landscape now". You can only specify things like:
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
You can specify what view controllers support what orientations, and react to the orientation changes by overriding functions, however when and how those functions are called is determined by the system. You can get more detailed messages from the UIDevice class too.
If I understand correctly what you are saying, your app is essentially always in one single orientation, however you are just drawing your various views differently to make it seem like certain parts of the app are in portrait/landscape mode? It sounds like you are trying to fit a square in a round hole, the iPhone's orientation API's weren't designed for that kind of behavior, and you are better off working with the API's than against them.