UISplitViewController 始终在 iPad 纵向模式 iOS 9 中显示主视图

Question

I'm building a universal app using UISplitViewController and targeting iOS 9 and above. The app language is Objective-C.

Having started with the Xcode Master/Detail template and set up my views in the standard way, I'm realising that the app will be better if I keep the master view on screen at all times (on iPad), including when the device is in portrait mode. However, no matter how hard I search, I can't find anything to help me learn how this is achieved. I know this was previously achieved using splitViewController:shouldHideViewController:inOrientation:

However, this method is deprecated in iOS 9 and I can't figure out what replaces it and why. I've looked at the new delegate methods for UISplitViewController and find them completely lacking in any level of intuitiveness.

I'd really appreciate some pointers in regard to what replaces splitViewController:shouldHideViewController:inOrientation: and how it can be used to keep the master view displayed at all times on the iPad.

Answer 1

Subclass UISplitViewController

There is no need to specifically track orientation changes: Master and Detail will still be displayed in sequence on iPhone in portrait mode, and most iPhone in landscape mode.
preferredDisplayMode:.allVisible only affects the modes where both views can be simultaneously visible.

Swift

class SplitViewController: UISplitViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        preferredDisplayMode = .allVisible
    }
}

Obj-C

- (void)viewDidLoad {
    [super viewDidLoad];
    self.preferredDisplayMode = UISplitViewControllerDisplayModeAllVisible;

}

iPad Portrait & iPhone 8 Plus Landscape

Answer 2

如果有人最近检查了这个话题，IOS 14 中不推荐使用 .allVisible，请使用：splitVC.preferredDisplayMode = .oneBesideSecondary

aSplitViewController.preferredDisplayMode = .oneBesideSecondary