UISplitViewController.showDetailViewController() not working in iPhone version.

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Created 1w

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Since updating to Tahoe and Xcode 26 I have found that the UISplitViewController.showDetailViewController() is not working in the iPhone version of my app (it is a universal app). I'm just trying to show a detail view after a tap on a UITableView item. The iPad versions are all working correctly. Has anyone else experienced this or have any advice about what may have changed? Thanks in advance.

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Answer 1

AnthonyB OP

1w

I thought I should supply a code sample to make my question more clear. I misspoke earlier, I'm showing the detail view from a UICollectionView. My detailVC just displays a piece of sheet music as a PDF. Any help would be appreciated.

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    guard let tuneID = self.dataSource.itemIdentifier(for: indexPath),
          let tune = try? self.dataController.mainContext?.existingObject(with: tuneID) as? Tune
    else { return }

    collectionView.deselectItem(at: indexPath, animated: true)

    guard let detailNC = TuneDetailVC.tuneDetailViewController(dataController: dataController),
          let detailVC = detailNC.topViewController as? TuneDetailVC
    else { return }

    detailVC.tune = tune
    splitViewController?.showDetailViewController(detailNC, sender: self)
    
    if splitViewController?.displayMode == .twoBesideSecondary {
        // Note: This should only occur in landscape on iPad.
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.25) { [weak self] in
            // Use 'hide' instead of settint 'preferredDisplayMode' for a smoother transition.
            self?.splitViewController?.hide(.primary)
        }
    }
}

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