Hiding UISplitViewController overlay in portrait

Question

In adopting the new UISplitViewController I'm trying to make a change a default behaviour that occurs when using the UISplitViewControllerDisplayModeAutomatic mode.

When working in portrait I want the primary overlay to hide when the user triggers a push to the detail side. By default the overlay remains onscreen until the user taps over on the detail side.

I've tried using the following with the delegate:

- (BOOL)splitViewController:(UISplitViewController *)splitViewController showDetailViewController:(UIViewController *)vc sender:(id)sender
{
    if (splitViewController.displayMode == UISplitViewControllerDisplayModePrimaryOverlay) {
        [UIView animateWithDuration:0.3 animations:^{
            splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModePrimaryHidden;
        }];
    }
    return NO;
}

This gives me the desired behavior in portrait, but this breaks landscape mode (which I want to behave like UISplitViewControllerDisplayModeAllVisible). If you've done a push and then rotate the device the left side is still hidden (as expected). I can't find an appriprite place to hook in to re-set the prefered mode on rotation to show the left side (since trait collections can't be used to tell landscape vs portrait on the iPad).

How can I manually trigger a dismissal of the overlay?

Dupe note: iOS8 has changed UISplitViewController entirely, so all other SO answers before June '14 are probably wrong (and I've dug through many of them, just incase)

Answer 1

I was having the same problem as you. I am doing this on Xamarin's mono touch platform, but I would think the result would be the same.

Like what LaborEtArs said, move your code to the prepareForSegue:sender: method of the master view controller. Then just set the mode to automatic after you set it to hidden:

if (splitViewController.displayMode == UISplitViewControllerDisplayModePrimaryOverlay) {
    splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModePrimaryHidden;
    splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModeAutomatic;
}

After doing it this way, it's no longer breaking landscape mode.

Answer 2

Just place your code (without the return NO;) in the master view controllers prepareForSegue:sender: or tableView:didSelectRowAtIndexPath: method. There it works perfectly!

Answer 3

In addition to the advice from LaborEtArs to do your animation in prepareForSegue:sender: or tableView:didSelectRowAtIndexPath:, if your app normally has splitViewController:preferredDisplayMode set to UISplitViewControllerDisplayModeAutomatic, simply use the animateWithDuration: method with a completion handler to restore the displayMode after the animation:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"showDetail"]) {

        // configure the detail controller

        if (self.splitViewController.displayMode == UISplitViewControllerDisplayModePrimaryOverlay) {
            [UIView animateWithDuration:0.3 animations:^{
                self.splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModePrimaryHidden;
            } completion:^(BOOL finished){
                self.splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModeAutomatic;
        }];
    }
}