在iPad的UIPageViewController中强制使用肖像模式

Question

I have an iPad app which supports Portrait and Landscape in the entire app. This is an iOS 7 and iOS 8 version of an app.

The app is a UITableViewController with multiple segues to a different set of UIViewControllers . I have one option in the app to show the Tutorial again and I have created the images in a Portrait mode only orientation because it just wouldn't make too much sense (or look good in Landscape).

With this in mind, the tutorial is in the form of images loaded into a UIPageViewController . The images are loaded in the viewDidLoad and the buttons and layout work really well.

Issue I want to restrict the UIPageViewController to be in a Portrait orientation only.

Currently, I have:

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    [[UIDevice currentDevice] setValue:
     [NSNumber numberWithInteger: UIInterfaceOrientationPortrait]
                                forKey:@"orientation"];

}

That works to some extent. If the device is in Landscape mode and the tutorial is invoked, it rotates it to Portrait.

However, if the device is in Portrait and I rotate it to Landscape after invoking the Tutorial, the tutorial then rotates.

How exactly do I prevent this view from rotating in my custom UIPageViewController class, so that it never rotates to Landscape whether it's at the start, middle, or end of the tutorial.

Any guidance on this would really be appreciated.

Answer 1

Take a look at UIViewController docs for Orientation support, specifically shouldAutorotate: and supportedInterfaceOrientations - https://developer.apple.com/library/ios/DOCUMENTATION/UIKit/Reference/UIViewController_Class/index.html#//apple_ref/occ/instm/UIViewController/supportedInterfaceOrientations

My first guess would be you would want to set the value like you're doing now, and then override shouldAutorotate in your custom UIPageViewController subclass and return NO.

However, be aware you could get hit in the review process for HIG compliance, because your app claims to support all orientations, but parts of it don't. Obviously this is totally up to the reviewer and whether or not they catch it as plenty of other apps do this.