Using UIImagePicker in iPad with Landscape only on iOS 6 - ipad

Question

I am making an iPad app that only supports landscape orientations, and in that app i am calling the photo Library using the following code
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType =
UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.mediaTypes = [NSArray arrayWithObjects: (NSString *) kUTTypeImage, nil];
self.iPadPopoverController = [[UIPopoverController alloc] initWithContentViewController:imagePicker];
[self.iPadPopoverController setDelegate:self];
[self.iPadPopoverController presentPopoverFromRect:CGRectMake(490, 638, 44, 44) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
However, This causes a crash with the following exception:
Uncaught exception: Supported orientations has no common orientation with the application, and shouldAutorotate is returning YES
The Reason for the Crash:
After researching I found that the crash was due to the UIImagePickerController always being displayed in Portrait mode even when the interface orientation is Landscape.
How I tried to solve it:
After reading the
iOS6 release notes and several questions previously posted; I found that the method from which the crash was originating was in the Application Delegate's
- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
the obvious solution was to have it return UIInterfaceOrientationMaskLandscape|UIInterfaceOrientationMaskPortrait
however, I want my app to support Landscape only! so my first solution was to add a Boolean flag to the App Delegate and set it to YES just before I call the UIImagePickerController and set back to NO after I dismiss it.
And it worked, but I was not happy with it, it felt like a messy solution. So instead I had the method check for its caller and if it were the function that initializes the UIImagePickerController then the method would return UIInterfaceOrientationMaskPortrait.
-(BOOL) iPadPopoverCallerFoundInStackSymbols{
NSArray *stackSymbols = [NSThread callStackSymbols];
for (NSString *sourceString in stackSymbols) {
if ([sourceString rangeOfString:#"[UIViewController(PhotoImport) importPhotoFromAlbum]"].location == NSNotFound) {
continue;
}else{
return YES;
}
}
return NO;
}
That solution worked on the simulator and on the device.
Here is the weird part
After submitting my app to the store, all my users were reporting that the app was crashing whenever they would access the photo library. I looked over the crash reports and found that the crash was occurring due to the exception mentioned above. I could not understand why this was happening.
So I submitted a TSI(Technical Support Incident) to apple about this issue. They replied that the stack symbols are not human readable after the app is archived and that is why my check would always fail.
They also suggested testing on devices by archiving the project first into a .ipa file and installing it through iTunes inorder to detect issues like this in the future.
That's Great but my problem still exists
Does anyone know how to solve this problem?

Answer 1

In info.plist declare all orientations as supported.
You no longer need method application:supportedInterfaceOrientationsForWindow:, so it can be deleted.
Subclass root view controller
Add following methods:
- (BOOL)shouldAutorotate {
return YES;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}
- (NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskLandscape;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
if (UIInterfaceOrientationIsLandscape(self.interfaceOrientation)) {
return self.interfaceOrientation;
} else {
return UIInterfaceOrientationLandscapeRight;
}
}
If you present modal view controllers and don't want them to be rotated, then you need to add this code to their root controllers too.