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

This put up is updated for Xcode 14.0 Beta 1 and iOS 16 Beta 1. It supersedes a model of this put up that you could find right here

On iOS 15, Apple granted builders the power to current partially seen backside sheets utilizing a part known as UISheetPresentationController. Initially, we needed to resort to utilizing a UIHostingController to carry 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 totally 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 {
                Shade(pink: 0.95, inexperienced: 0.9, blue: 1)
                Textual content("That is my sheet. It may very well be an entire 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 will be expanded to 70% of the display screen peak. If I need to permit the consumer to develop my sheet to the complete peak of the display screen I’d add the .massive choice to the record of presentationDetents.

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