Duo Probe: what a Flutter app can see on the Duo
Juan Carlos Ramón Condezo ran a Flutter probe app through 21 Duo simulator setups and logged each. Flutter cannot see the fold, so half-open and open look the same, and Split View leaves only 469 points of width.
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More ideas
The whole wall
10 things to know before you design for iPhone Duo
Craig Clayton's animated explainer, with the SwiftUI code for each point: controls moving to the side when closed, content shifting off the hinge half-folded, sheets placing themselves, and two apps side by side.
CompatArrangementView: a sign-in page split at the fold
by codelaby
codelaby's SwiftUI layout in the Duo simulator. On the cover, the artwork fills the screen behind the sign-in button. Open or half-folded, artwork and sign-in take one half each, and it still fits a Split View pane.