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

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


Printed on: June 6, 2022

This submit is updated for Xcode 14.0 Beta 1 and iOS 16 Beta 1. It supersedes a model of this submit that yow will discover right here

On iOS 15, Apple granted builders the power to current partially seen backside sheets utilizing a element referred to as UISheetPresentationController. Initially, we needed to resort to utilizing a UIHostingController to carry this element 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’s peak.

To do that, you possibly can 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 could possibly 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 and could be expanded to 70% of the display peak. If I need to enable the consumer to increase my sheet to the complete peak of the display I’d add the .massive choice to the listing 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.

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