I have an iPhone tab view application that has not been designed for iPad, and I am aiming to add a left-hand bar that summarises some content and keeps visible what is normally a sheet. What pattern would work best for this? At present, I pass the view to another view with a navigation stack containing an arrangement view with the previous view and then the sidebar as a secondary view within it—would that be the appropriate approach?

I’m testing a SwiftUI app on the iPhone Duo simulator running iOS 27\.1 and have noticed some unexpected behaviour when using pinned Picture in Picture\. When the device is unfolded in portrait and a PiP video is pinned to the top of the display, the available app height drops significantly, but `verticalSizeClass` remains `.regular`\. For comparison, these are the values reported by `GeometryReader`: |Configuration |Available size (pt)|Horizontal|Vertical | |------------------------------|-------------------|----------|----------| |Unfolded landscape |867 × 611 |`.regular`|`.regular`| |Unfolded portrait |669 × 786 |`.regular`|`.regular`| |Unfolded portrait + pinned PiP|669 × 348 |`.regular`|`.regular`| I’d expected the vertical size class to become `.compact` when pinned PiP reduces the available height to approximately 348 points\. Is this intentional behaviour, with size classes remaining tied to the unfolded display configuration rather than the available app window dimensions, or is it potentially a bug in iOS 27\.1? I’m currently working around it by checking the available geometry directly, but I’d be interested to know what the recommended approach is for adapting SwiftUI layouts in this configuration\.

I currently have an iPhone tab view application without iPad views, and I am aiming to add a left-hand bar that summarises content and keeps what is normally a sheet permanently visible. What pattern would work best for this? At present, I pass the view to another view with a navigation stack containing an arrangement view with the previous view and then the sidebar as a secondary view; would that be the appropriate approach?