Ipad – UISplitViewController not showing popup button when launching portrait

ipadlaunchportraituisplitviewcontroller

I am doing an iPad app based on a UISplitViewController. I have a little problem with the toobar button when my app launched in potrait. The button to show the popover is not displayed.
However when I rotate my iPad into landscape and then back to portrait, the button shows !

It looks like the following method is not called on launch (this is were I have the code showing the button):

- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController: (UIPopoverController *)pc

This method is not called when the app launches but only when there is a rotation. What is even stranger is that I made a test app using Xcode UISplitViewController template + core data (which is similar to the app I am working on, and is the template I used to make this app). On the test app on which I have not made a single line of code, the button shows when I launch my app in portrait mode and the method above is also called upon launching, as opposed to my other app. Does anyone had a similar problem ?

Finally, it is not very clear from apple documentation whether this method is supposed to be called when a UISplitViewController is first shown:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UISplitViewControllerDelegate_protocol/Reference/Reference.html%23//apple_ref/doc/uid/TP40009454

Best Answer

"Kshitiz" has the right concept. first I set the self.splitviewController.delegate = self in the viewDidLoad method, which it is a bit late to set this delegation. So, I tried to set the delegation in earlier stage which is awakeFromNib method. Then it works well.

So, the problem is after view already loaded by viewDidLoad, then the delegation will not work, it will work some time after some activities (such as rotate the iPad). So the earlier stage than viewDidLoad is awakeFromNib.

Here is the code that works:

- (void) awakeFromNib{
    [super awakeFromNib];
    self.splitViewController.delegate = self;
}

Related Solutions

Ipad – UISplitViewController: How force to show master popover in app launch? (portrait)

No suggestion here for 5.1, but one for 8.0:

Now with iOS8, there are a bunch of new methods for UISplitViewController configuration.

In your case, juste set the right value in preferredDisplayMode, for example in the masterViewController viewDidLoad.

Objective-C:

- (void)viewDidLoad {
    // configuring splitviewcontroller
    self.splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModeAllVisible;

    //....
}

Swift:

    override func viewDidLoad() {
        self.splitViewController?.preferredDisplayMode = UISplitViewControllerDisplayMode.AllVisible
    }

But it's of course iOS8 only.

Ios – UISplitViewController in portrait on iPhone shows detail VC instead of master

Oh man, this was causing me a headache for a few days and could not figure out how to do this. The worst part was that creating a new Xcode iOS project with the master-detail template worked just fine. Fortunately, in the end, that little fact was how I found the solution.

There are some posts I've found that suggest that the solution is to implement the new primaryViewControllerForCollapsingSplitViewController: method on UISplitViewControllerDelegate. I tried that to no avail. What Apple does in the master-detail template that seems to work is implement the new (take a deep breath to say all of this one) splitViewController:collapseSecondaryViewController:ontoPrimaryViewController: delegate method (again on UISplitViewControllerDelegate). According to the docs, this method:

Asks the delegate to adjust the primary view controller and to incorporate the secondary view controller into the collapsed interface.

Make sure to read up on the discussion part of that method for more specific details.

The way that Apple handles this is:

- (BOOL)splitViewController:(UISplitViewController *)splitViewController
collapseSecondaryViewController:(UIViewController *)secondaryViewController
  ontoPrimaryViewController:(UIViewController *)primaryViewController {

    if ([secondaryViewController isKindOfClass:[UINavigationController class]]
        && [[(UINavigationController *)secondaryViewController topViewController] isKindOfClass:[DetailViewController class]]
        && ([(DetailViewController *)[(UINavigationController *)secondaryViewController topViewController] detailItem] == nil)) {

        // Return YES to indicate that we have handled the collapse by doing nothing; the secondary controller will be discarded.
        return YES;

    } else {

        return NO;

    }
}

This implementation basically does the following:

If secondaryViewController is what we're expecting (a UINavigationController), and it's showing what we're expecting (a DetailViewController -- your view controller), but has no model (detailItem), then "Return YES to indicate that we have handled the collapse by doing nothing; the secondary controller will be discarded."
Otherwise, return "NO to let the split view controller try and incorporate the secondary view controller’s content into the collapsed interface"

The results are the following for the iPhone in portrait (either starting in portrait or rotating to portrait -- or more accurately compact size class):

If your view is correct
- and has a model, show the detail view controller
- but has no model, show the master view controller
If your view is not correct
- show the master view controller

Clear as mud.

Best Answer

Related Solutions

Ipad – UISplitViewController: How force to show master popover in app launch? (portrait)

Ios – UISplitViewController in portrait on iPhone shows detail VC instead of master

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