Because the launch of iOS 16, it’s simple to create an interactive backside sheet utilizing SwiftUI. All it is advisable to 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, in case you’ve forgotten its utilization, let’s try the pattern code under.
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()
}
}
}
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struct BasicBottomSheet: View { @State non-public 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 utilize 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 .top
are the built-in detents.
Aside from 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 be capable 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 notice 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:
.presentationBackground(.yellow) |
By making use of a background materials kind, you may create a blur impact to the sheet. Right here is the pattern code:
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)
}
}
}
}
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struct ContentView: View { @State non-public 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
with the intention to add a translucent layer between the sheet and the background picture.
Optionally, you may create a customized view because the sheet’s background utilizing the modifier like this:
.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 unattainable 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
:
.presentationBackgroundInteraction(.enabled) |
On this case, customers can work together with the view behind the sheet.
You may as well restrict the background interplay to a sure detent. As an example, the underside sheet comes with three completely different intents like this:
.presentationDetents([ .height(100), .medium, .large]) |
Should you solely need your customers to work together with the background view for a particular intent, you may write the presentationBackgroundInteraction
modifier like under:
.presentationBackgroundInteraction(.enabled(upThrough: .top(100))) |
Defining the Scrolling Behaviour
By default, when a scroll view is included within the backside sheet, the sheet usually expands to the subsequent detent as a consumer swipes up on the scroll view. Should you don’t know what this implies, let’s try one other instance.
For instance, you current a listing of things in a backside sheet like this:
.sheet(isPresented: $showSheet) { Listing(1...20, id: .self) { index in Textual content(“Merchandise (index)“) } .presentationDetents([.medium, .large]) } |
While you activate the underside sheet, it is going to be introduced as much as the medium detent. Nonetheless, you couldn’t scroll by way of the listing. While you swipe up on the scroll view, the sheet merely expands to full display.
With the intention to let customers scroll by way of the listing even the sheet is half-opened, you may embed the presentationContentInteraction
modifier and set its worth to .scrolls
:
.sheet(isPresented: $showSheet) { Listing(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 way of the listing.
To resize the sheet, customers can maintain and drag the drag indicator.
Get a Sneak Peek
On the time of this writing, Apple remains to be testing iOS 16.4 in beta, however it’s anticipated to be launched to the general public quickly. If you need to experiment with the brand new SwiftUI adjustments, ensure that to obtain Xcode 14.3 (beta).