SwiftUI - Half modal?
Solution 1:
I've written a Swift Package that includes a custom modifier that allows you to use the half modal sheet.
Here is the link: https://github.com/AndreaMiotto/PartialSheet
Feel free to use it or to contribute
Solution 2:
You can make your own and place it inside of a zstack: https://www.mozzafiller.com/posts/swiftui-slide-over-card-like-maps-stocks
struct SlideOverCard<Content: View> : View {
@GestureState private var dragState = DragState.inactive
@State var position = CardPosition.top
var content: () -> Content
var body: some View {
let drag = DragGesture()
.updating($dragState) { drag, state, transaction in
state = .dragging(translation: drag.translation)
}
.onEnded(onDragEnded)
return Group {
Handle()
self.content()
}
.frame(height: UIScreen.main.bounds.height)
.background(Color.white)
.cornerRadius(10.0)
.shadow(color: Color(.sRGBLinear, white: 0, opacity: 0.13), radius: 10.0)
.offset(y: self.position.rawValue + self.dragState.translation.height)
.animation(self.dragState.isDragging ? nil : .spring(stiffness: 300.0, damping: 30.0, initialVelocity: 10.0))
.gesture(drag)
}
private func onDragEnded(drag: DragGesture.Value) {
let verticalDirection = drag.predictedEndLocation.y - drag.location.y
let cardTopEdgeLocation = self.position.rawValue + drag.translation.height
let positionAbove: CardPosition
let positionBelow: CardPosition
let closestPosition: CardPosition
if cardTopEdgeLocation <= CardPosition.middle.rawValue {
positionAbove = .top
positionBelow = .middle
} else {
positionAbove = .middle
positionBelow = .bottom
}
if (cardTopEdgeLocation - positionAbove.rawValue) < (positionBelow.rawValue - cardTopEdgeLocation) {
closestPosition = positionAbove
} else {
closestPosition = positionBelow
}
if verticalDirection > 0 {
self.position = positionBelow
} else if verticalDirection < 0 {
self.position = positionAbove
} else {
self.position = closestPosition
}
}
}
enum CardPosition: CGFloat {
case top = 100
case middle = 500
case bottom = 850
}
enum DragState {
case inactive
case dragging(translation: CGSize)
var translation: CGSize {
switch self {
case .inactive:
return .zero
case .dragging(let translation):
return translation
}
}
var isDragging: Bool {
switch self {
case .inactive:
return false
case .dragging:
return true
}
}
}
Solution 3:
In Swift 5.5 iOS 15+ and Mac Catalyst 15+ there is a
There is a new solution with adaptiveSheetPresentationController
https://developer.apple.com/documentation/uikit/uipopoverpresentationcontroller/3810055-adaptivesheetpresentationcontrol?changes=__4
@available(iOS 15.0, *)
struct CustomSheetParentView: View {
@State private var isPresented = false
var body: some View {
VStack{
Button("present sheet", action: {
isPresented.toggle()
}).adaptiveSheet(isPresented: $isPresented, detents: [.medium()], smallestUndimmedDetentIdentifier: .large){
Rectangle()
.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
.foregroundColor(.clear)
.border(Color.blue, width: 3)
.overlay(Text("Hello, World!").frame(maxWidth: .infinity, maxHeight: .infinity)
.onTapGesture {
isPresented.toggle()
}
)
}
}
}
}
@available(iOS 15.0, *)
struct AdaptiveSheet<T: View>: ViewModifier {
let sheetContent: T
@Binding var isPresented: Bool
let detents : [UISheetPresentationController.Detent]
let smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier?
let prefersScrollingExpandsWhenScrolledToEdge: Bool
let prefersEdgeAttachedInCompactHeight: Bool
init(isPresented: Binding<Bool>, detents : [UISheetPresentationController.Detent] = [.medium(), .large()], smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier? = .medium, prefersScrollingExpandsWhenScrolledToEdge: Bool = false, prefersEdgeAttachedInCompactHeight: Bool = true, @ViewBuilder content: @escaping () -> T) {
self.sheetContent = content()
self.detents = detents
self.smallestUndimmedDetentIdentifier = smallestUndimmedDetentIdentifier
self.prefersEdgeAttachedInCompactHeight = prefersEdgeAttachedInCompactHeight
self.prefersScrollingExpandsWhenScrolledToEdge = prefersScrollingExpandsWhenScrolledToEdge
self._isPresented = isPresented
}
func body(content: Content) -> some View {
ZStack{
content
CustomSheet_UI(isPresented: $isPresented, detents: detents, smallestUndimmedDetentIdentifier: smallestUndimmedDetentIdentifier, prefersScrollingExpandsWhenScrolledToEdge: prefersScrollingExpandsWhenScrolledToEdge, prefersEdgeAttachedInCompactHeight: prefersEdgeAttachedInCompactHeight, content: {sheetContent}).frame(width: 0, height: 0)
}
}
}
@available(iOS 15.0, *)
extension View {
func adaptiveSheet<T: View>(isPresented: Binding<Bool>, detents : [UISheetPresentationController.Detent] = [.medium(), .large()], smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier? = .medium, prefersScrollingExpandsWhenScrolledToEdge: Bool = false, prefersEdgeAttachedInCompactHeight: Bool = true, @ViewBuilder content: @escaping () -> T)-> some View {
modifier(AdaptiveSheet(isPresented: isPresented, detents : detents, smallestUndimmedDetentIdentifier: smallestUndimmedDetentIdentifier, prefersScrollingExpandsWhenScrolledToEdge: prefersScrollingExpandsWhenScrolledToEdge, prefersEdgeAttachedInCompactHeight: prefersEdgeAttachedInCompactHeight, content: content))
}
}
@available(iOS 15.0, *)
struct CustomSheet_UI<Content: View>: UIViewControllerRepresentable {
let content: Content
@Binding var isPresented: Bool
let detents : [UISheetPresentationController.Detent]
let smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier?
let prefersScrollingExpandsWhenScrolledToEdge: Bool
let prefersEdgeAttachedInCompactHeight: Bool
init(isPresented: Binding<Bool>, detents : [UISheetPresentationController.Detent] = [.medium(), .large()], smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier? = .medium, prefersScrollingExpandsWhenScrolledToEdge: Bool = false, prefersEdgeAttachedInCompactHeight: Bool = true, @ViewBuilder content: @escaping () -> Content) {
self.content = content()
self.detents = detents
self.smallestUndimmedDetentIdentifier = smallestUndimmedDetentIdentifier
self.prefersEdgeAttachedInCompactHeight = prefersEdgeAttachedInCompactHeight
self.prefersScrollingExpandsWhenScrolledToEdge = prefersScrollingExpandsWhenScrolledToEdge
self._isPresented = isPresented
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIViewController(context: Context) -> CustomSheetViewController<Content> {
let vc = CustomSheetViewController(coordinator: context.coordinator, detents : detents, smallestUndimmedDetentIdentifier: smallestUndimmedDetentIdentifier, prefersScrollingExpandsWhenScrolledToEdge: prefersScrollingExpandsWhenScrolledToEdge, prefersEdgeAttachedInCompactHeight: prefersEdgeAttachedInCompactHeight, content: {content})
return vc
}
func updateUIViewController(_ uiViewController: CustomSheetViewController<Content>, context: Context) {
if isPresented{
uiViewController.presentModalView()
}else{
uiViewController.dismissModalView()
}
}
class Coordinator: NSObject, UIAdaptivePresentationControllerDelegate {
var parent: CustomSheet_UI
init(_ parent: CustomSheet_UI) {
self.parent = parent
}
//Adjust the variable when the user dismisses with a swipe
func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
if parent.isPresented{
parent.isPresented = false
}
}
}
}
@available(iOS 15.0, *)
class CustomSheetViewController<Content: View>: UIViewController {
let content: Content
let coordinator: CustomSheet_UI<Content>.Coordinator
let detents : [UISheetPresentationController.Detent]
let smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier?
let prefersScrollingExpandsWhenScrolledToEdge: Bool
let prefersEdgeAttachedInCompactHeight: Bool
private var isLandscape: Bool = UIDevice.current.orientation.isLandscape
init(coordinator: CustomSheet_UI<Content>.Coordinator, detents : [UISheetPresentationController.Detent] = [.medium(), .large()], smallestUndimmedDetentIdentifier: UISheetPresentationController.Detent.Identifier? = .medium, prefersScrollingExpandsWhenScrolledToEdge: Bool = false, prefersEdgeAttachedInCompactHeight: Bool = true, @ViewBuilder content: @escaping () -> Content) {
self.content = content()
self.coordinator = coordinator
self.detents = detents
self.smallestUndimmedDetentIdentifier = smallestUndimmedDetentIdentifier
self.prefersEdgeAttachedInCompactHeight = prefersEdgeAttachedInCompactHeight
self.prefersScrollingExpandsWhenScrolledToEdge = prefersScrollingExpandsWhenScrolledToEdge
super.init(nibName: nil, bundle: .main)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func dismissModalView(){
dismiss(animated: true, completion: nil)
}
func presentModalView(){
let hostingController = UIHostingController(rootView: content)
hostingController.modalPresentationStyle = .popover
hostingController.presentationController?.delegate = coordinator as UIAdaptivePresentationControllerDelegate
hostingController.modalTransitionStyle = .coverVertical
if let hostPopover = hostingController.popoverPresentationController {
hostPopover.sourceView = super.view
let sheet = hostPopover.adaptiveSheetPresentationController
//As of 13 Beta 4 if .medium() is the only detent in landscape error occurs
sheet.detents = (isLandscape ? [.large()] : detents)
sheet.largestUndimmedDetentIdentifier =
smallestUndimmedDetentIdentifier
sheet.prefersScrollingExpandsWhenScrolledToEdge =
prefersScrollingExpandsWhenScrolledToEdge
sheet.prefersEdgeAttachedInCompactHeight =
prefersEdgeAttachedInCompactHeight
sheet.widthFollowsPreferredContentSizeWhenEdgeAttached = true
}
if presentedViewController == nil{
present(hostingController, animated: true, completion: nil)
}
}
/// To compensate for orientation as of 13 Beta 4 only [.large()] works for landscape
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
if UIDevice.current.orientation.isLandscape {
isLandscape = true
self.presentedViewController?.popoverPresentationController?.adaptiveSheetPresentationController.detents = [.large()]
} else {
isLandscape = false
self.presentedViewController?.popoverPresentationController?.adaptiveSheetPresentationController.detents = detents
}
}
}
@available(iOS 15.0, *)
struct CustomSheetView_Previews: PreviewProvider {
static var previews: some View {
CustomSheetParentView()
}
}
Solution 4:
As of Beta 2 Beta 3 you can't present a modal View as .fullScreen. It presents as .automatic -> .pageSheet. Even once that's fixed, though, I highly doubt they will give you the drag capability there for free. It would be included in the docs already.
You can use this answer to present full screen for now. Gist here.
Then, after presentation, this is a quick and dirty example of how you can recreate that interaction.
@State var drag: CGFloat = 0.0
var body: some View {
ZStack(alignment: .bottom) {
Spacer() // Use the full space
Color.red
.frame(maxHeight: 300 + self.drag) // Whatever minimum height you want, plus the drag offset
.gesture(
DragGesture(coordinateSpace: .global) // if you use .local the frame will jump around
.onChanged({ (value) in
self.drag = max(0, -value.translation.height)
})
)
}
}