On iPadOS 14, UISplitViewController embedded in UITabBarController is always collapsed
Originator: | simon.liotier | ||
Number: | rdar://FB8349717 | Date Originated: | 08/11/2020 |
Status: | Open | Resolved: | |
Product: | UIKit | Product Version: | iOS 14 |
Classification: | Reproducible: |
Example project: https://github.com/simonliotier/FB8349717 On iPadOS 14 (beta 4), UISplitViewController embedded in UITabBarController is always collapsed, preventing to display 2 or 3 columns side by side. 1. Create a `UISplitViewController` with a `doubleColumn` or `tripleColumn` style. 2. Set its `preferredDisplayMode` to `.oneBesideSecondary` (or `.twoBesideSecondary` for the `tripleColumn` style). 3. Embed the split view controller in a `UITabBarController`. 4. Launch the app on iPad. - Expected behavior: both the primary and secondary view controllers should be displayed side by side (expanded interface). - Actual behavior: only the secondary view controller is displayed in the `UITabBarController` (collapsed interface). 5. Print the split view controller `horizontalSizeClass`. It is `.compact`. It should be `.regular`. That is why the split view controller is collapsed instead of expanded. This is a regression. Embedding a `UISplitViewController` in a `UITabBarController` works well on iOS 13 (and before).
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