Presenting {a partially} seen backside sheet in SwiftUI on iOS 16

This submit is updated for Xcode 14.0 Beta 1 and iOS 16 Beta 1. It supersedes a model of this submit that you’ll find right here

On iOS 15, Apple granted builders the flexibility to current partially seen backside sheets utilizing a part referred to as UISheetPresentationController. Initially, we needed to resort to utilizing a UIHostingController to convey this part to SwiftUI.

With iOS 16, we do not have to do that anymore. You can also make use of the presentationDetents view modifier to configure your sheets to be absolutely seen, roughly half seen, or some customized fraction of the display screen’s peak.

To do that, you may apply the presentationDetents modifier by making use of it to your sheet’s content material:

struct DetentsView: View {
    @State var isShowingSheet = false

    var physique: some View {
        Button("Present the sheet!") {
            isShowingSheet = true
        }
        .sheet(isPresented: $isShowingSheet) {
            ZStack {
                Colour(pink: 0.95, inexperienced: 0.9, blue: 1)
                Textual content("That is my sheet. It may very well be a complete view, or only a textual content.")
            }
            .presentationDetents([.medium, .fraction(0.7)])
        }
    }
}

Here is what the sheet appears to be like like when it is offered on an iPhone:

On this instance, my sheet will initially take up about half the display screen and might be expanded to 70% of the display screen peak. If I need to enable the person to develop my sheet to the total peak of the display screen I’d add the .massive choice to the checklist of presentationDetents.

By default, sheets will solely assist the .massive detent so that you needn’t use the presentationDetents view modifier once you need your sheet to solely assist the view’s full peak.