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
Related
I am using the following code to set the device orientation
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];
when i used i got the warning and i found the below code to fix that warning.
#interface UIDevice (MyPrivateNameThatAppleWouldNeverUseGoesHere)
- (void) setOrientation:(UIInterfaceOrientation)orientation;
#end
Now what i would like to know is ...
Can the app store accepts this code to be in an application?
Thanks for any help!.
oh god, no. The warning you're getting is because this is not a readwrite property; merely adding a category that declares the method will not let you set the orientation. Not only will the AppStore not accept this, it will crash the first time it's called, as there's no accessor. (well, it will PROBABLY crash. There may be an undocumented API here, in which case you'll JUST get rejected).
If you are trying to rotate the view programmatically, you should look at shouldAutorotateToInterfaceOrientation and if you just want the App to be of a specific orientation, try using UIInterfaceOrientation set in plist.
Another useful post:
Forcing UIInterfaceOrientation changes on iPhone
Instead of setting an orientation, the proper way to do it is by having your application listen for when the user rotates the phone, then return YES or NO to indicate that the app should, in fact, rotate (i.e. always return NO if you want the app to always remain in its initial state.) The shouldAutorotateToInterfaceOrientation: method is automatically called whenever the user changes orientation.
For example, in your view controller, implement the method to only allow the phone to be used in landscape right/left:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if (UIDeviceOrientationIsLandscape) { return YES };
return NO;
}
You will also want to set your app's default orientation (so it doesn't start in portrait mode) by adding the UIInterfaceOrientation tag to your app's info.plist file with the value UIInterfaceOrientationLandscapeRight. Otherwise, the default value is portrait, and the user will have to tilt the phone to get it into the expected orientation.
I have the following code:
-(void)viewWillAppear:(BOOL)animated {
UIDeviceOrientation orientation = [[UIDevice currentDevice] UIInterface];
if(orientation==UIDeviceOrientationLandscapeLeft || orientation==UIDeviceOrientationLandscapeRight) {
NSLog(#"Device Landscape");
} else {
NSLog(#"Device Portrait");
}
}
This works perfectly for the simulator and on the device but only if the iPad is not flat on a surface, for example if i lay the iPad on my desk and load the view it will say its portrait and so I cant detect the orientation when the view appears.
Any ideas of the best way to detect the interface orientation when the viewWillAppear is called?
Thanks
You should use [self interfaceOrientation] instead of the device orientation.
[[UIApplication sharedApplication] statusBarOrientation] also works if you are somewhere in the code that does not have access to [self interfaceOrientation]
First, do you know about the interfaceOrientation property of UIViewController? It looks like you are trying to duplicate it. If you really want to do that, simply subscribe to device orientation change notifications, check if the new orientation is valid interface orientation (the is a macro for that) and if yes, store the value to some variable (like lastSeenOrientation). Then you can rely on that value wherever you want.
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.
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)
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?