geometryGroup()
Isolates the geometry (e.g. position and size) of the view from its parent view.
Declaration
nonisolated func geometryGroup() -> some View
Discussion
By default SwiftUI views push position and size changes down through the view hierarchy, so that only views that draw something (known as leaf views) apply the current animation to their frame rectangle. However in some cases this coalescing behavior can give undesirable results; inserting a geometry group can correct that. A group acts as a barrier between the parent view and its subviews, forcing the position and size values to be resolved and animated by the parent, before being passed down to each subview.
The example below shows one use of this function: ensuring that the member views of each row in the stack apply (and animate as) a single geometric transform from their ancestor view, rather than letting the effects of the ancestor views be applied separately to each leaf view. If the members of ItemView may be added and removed at different times the group ensures that they stay locked together as animations are applied.
VStack {
ForEach(items) { item in
ItemView(item: item)
.geometryGroup()
}
}Returns: a new view whose geometry is isolated from that of its parent view.