For the reason that launch of iOS 16, it’s straightforward to create an interactive backside sheet utilizing SwiftUI. All it’s essential do is to embed a modifier known as presentationDetents in a Sheet view. Earlier, we printed a detailed tutorial to stroll you thru the API. Nonetheless, for those who’ve forgotten its utilization, let’s take a look at the pattern code beneath.
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struct BasicBottomSheet: View { @State personal var showSheet = false var physique: some View { VStack { Button(“Present Backside Sheet”) { showSheet.toggle() } .buttonStyle(.borderedProminent) .sheet(isPresented: $showSheet) { Textual content(“That is the expandable backside sheet.”) .presentationDetents([.medium, .large]) } Spacer() } } } |
You employ the sheet modifier to create a presentation sheet and insert the presentationDetents modifer contained in the sheet to manage the dimensions of the sheet. Each .medium and .peak are the built-in detents.
Other than adjusting the peak of the sheet, there aren’t many choices to customise it. However, with the upcoming launch of iOS 16.4, you’ll have the ability to create customized backgrounds, have management over the scrolling of the sheet, and plenty of extra.
Let’s see what customization choices are launched for the presentation sheet. Please be aware that you just want Xcode 14.3 (or up) to comply with this tutorial.
Customizing the Background of SwiftUI Backside Sheet
With the brand new presentationBackground modifier, now you can change the background coloration of the sheet like this:
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.presentationBackground(.yellow) |
By making use of a background materials kind, you’ll be able to create a blur impact to the sheet. Right here is the pattern code:
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struct ContentView: View { @State personal var showSheet = false
var physique: some View { ZStack(alignment: .high) { Picture(“wallpaper”) .resizable() .scaledToFill() .clipped() .ignoresSafeArea()
Button(“Present Backside Sheet”) { showSheet.toggle() } .tint(.black) .buttonStyle(.borderedProminent) .sheet(isPresented: $showSheet) { Textual content(“That is the expandable backside sheet.”) .presentationDetents([ .medium, .large]) .presentationBackground(.thinMaterial)
} } } } |
We set the presentation background to .thinMaterial to be able to add a translucent layer between the sheet and the background picture.
Optionally, you’ll be able to create a customized view because the sheet’s background utilizing the modifier like this:
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.presentationBackground { Picture(“wallpaper”) } |
Customizing the Nook Radius of the Presentation Sheet
This new replace additionally comes with a brand new modifier named presentationCornerRadius which lets you alter the nook radius of the presentation sheet. Right here is an instance.
Enabling Background Interplay
In earlier iOS variations, SwiftUI would disable the view behind the underside sheet, which made it unimaginable for customers to work together with it till they dismissed the sheet. Ranging from iOS 16.4, SwiftUI introduces one other modifier known as presentationBackgroundInteraction for builders to allow/disable the interplay.
To allow the background interplay, you connect the presentationBackgroundInteraction modifier to the sheet view and set its worth to .enabled:
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.presentationBackgroundInteraction(.enabled) |
On this case, customers can work together with the view behind the sheet.
You can too restrict the background interplay to a sure detent. As an illustration, the underside sheet comes with three completely different intents like this:
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.presentationDetents([ .height(100), .medium, .large]) |
In case you solely need your customers to work together with the background view for a selected intent, you’ll be able to write the presentationBackgroundInteraction modifier like beneath:
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.presentationBackgroundInteraction(.enabled(upThrough: .peak(100))) |
Defining the Scrolling Behaviour
By default, when a scroll view is included within the backside sheet, the sheet sometimes expands to the subsequent detent as a person swipes up on the scroll view. In case you don’t know what this implies, let’s take a look at one other instance.
For instance, you current an inventory of things in a backside sheet like this:
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.sheet(isPresented: $showSheet) { Record(1...20, id: .self) { index in Textual content(“Merchandise (index)“) } .presentationDetents([.medium, .large]) } |
If you activate the underside sheet, will probably be introduced as much as the medium detent. Nonetheless, you couldn’t scroll by means of the checklist. If you swipe up on the scroll view, the sheet merely expands to full display screen.
As a way to let customers scroll by means of the checklist even the sheet is half-opened, you’ll be able to embed the presentationContentInteraction modifier and set its worth to .scrolls:
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.sheet(isPresented: $showSheet) { Record(1...20, id: .self) { index in Textual content(“Merchandise (index)“) } .presentationDetents([.medium, .large]) .presentationContentInteraction(.scrolls) } |
Now when the sheet is half-opened, customers can nonetheless swipe up/all the way down to scroll by means of the checklist.
To resize the sheet, customers can maintain and drag the drag indicator.
Get a Sneak Peek
On the time of this writing, Apple continues to be testing iOS 16.4 in beta, however it’s anticipated to be launched to the general public quickly. If you want to experiment with the brand new SwiftUI adjustments, be sure that to obtain Xcode 14.3 (beta).
