xcode SwiftUI - 半模态？
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SwiftUI - Half modal?
提问by ryannn
I'm trying to recreate a Modal just like Safari in iOS13 in SwiftUI:
我正在尝试在 SwiftUI 中重新创建一个类似于 iOS13 中的 Safari 的 Modal：
Here's what it looks like:
这是它的样子：
Does anyone know if this is possible in SwiftUI? I want to show a small half modal, with the option to drag to fullscreen, just like the sharing sheet.
有谁知道这在SwiftUI 中是否可行？我想显示一个小的半模态，可以选择拖动到全屏，就像共享表一样。
Any advice is much appreciated!
非常感谢任何建议！
回答by Andre Carrera
You can make your own and place it inside of a zstack: https://www.mozzafiller.com/posts/swiftui-slide-over-card-like-maps-stocks
您可以自己制作并将其放在 zstack 中：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
}
}
}
回答by Andrea Miotto
I've written a Swift Package that includes a custom modifier that allows you to use the half modal sheet.
我编写了一个 Swift 包，其中包含一个允许您使用半模态表的自定义修饰符。
Here is the link: https://github.com/AndreaMiotto/PartialSheet
这是链接：https: //github.com/AndreaMiotto/PartialSheet
Feel free to use it or to contribute
随意使用它或贡献
回答by arsenius
As of Beta 2Beta 3 you can't present a modal Viewas .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.
作为 测试版 2Beta 3 您不能将模态呈现View为.fullScreen. 它呈现为.automatic -> .pageSheet. 但是，即使修复了该问题，我也非常怀疑他们是否会免费为您提供拖动功能。它已经包含在文档中。
You can use this answerto present full screen for now. Gist here.
Then, after presentation, this is a quick and dirty example of how you can recreate that interaction.
然后，在演示之后，这是一个关于如何重新创建交互的快速而肮脏的示例。
@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)
})
)
}
}
回答by Viktor Maric
I have written a SwiftUI package which includes custom iOS 13 like half modal and its buttons.
我编写了一个 SwiftUI 包，其中包含自定义的 iOS 13，如半模态及其按钮。
GitHub repo: https://github.com/ViktorMaric/HalfModal
GitHub 存储库：https: //github.com/ViktorMaric/HalfModal
回答by Szymon W
Here's my naive bottom sheet which scales to its content. Without dragging but it should be relatively easy to add if needed :)
这是我的天真的底部工作表，可根据其内容进行缩放。无需拖动，但如果需要，添加应该相对容易:)
struct BottomSheet<SheetContent: View>: ViewModifier {
@Binding var isPresented: Bool
let sheetContent: () -> SheetContent
func body(content: Content) -> some View {
ZStack {
content
if isPresented {
VStack {
Spacer()
VStack {
HStack {
Spacer()
Button(action: {
withAnimation(.easeInOut) {
self.isPresented = false
}
}) {
Text("done")
.padding(.top, 5)
}
}
sheetContent()
}
.padding()
}
.zIndex(.infinity)
.transition(.move(edge: .bottom))
.edgesIgnoringSafeArea(.bottom)
}
}
}
extension View {
func customBottomSheet<SheetContent: View>(
isPresented: Binding<Bool>,
sheetContent: @escaping () -> SheetContent
) -> some View {
self.modifier(BottomSheet(isPresented: isPresented, sheetContent: sheetContent))
}
}
and use like below:
并使用如下：
.customBottomSheet(isPresented: $isPickerPresented) {
DatePicker(
"time",
selection: self.$time,
displayedComponents: .hourAndMinute
)
.labelsHidden()
}
回答by Belickas Kristupas
Andre Carrera's answer is great and feel free to use this guide he provided: https://www.mozzafiller.com/posts/swiftui-slide-over-card-like-maps-stocks
Andre Carrera 的回答很棒，可以随意使用他提供的指南：https: //www.mozzafiller.com/posts/swiftui-slide-over-card-like-maps-stocks
I have modified the SlideOverCard structure so it uses actual device height to measure where the card is supposed to stop (you can play with bounds.height to adjust for your needs):
我已经修改了 SlideOverCard 结构，因此它使用实际设备高度来测量卡应该停止的位置（您可以使用 bounds.height 来根据您的需要进行调整）：
struct SlideOverCard<Content: View>: View {
var bounds = UIScreen.main.bounds
@GestureState private var dragState = DragState.inactive
@State var position = UIScreen.main.bounds.height/2
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 + self.dragState.translation.height)
.animation(self.dragState.isDragging ? nil : .interpolatingSpring(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 + drag.translation.height
let positionAbove: CGFloat
let positionBelow: CGFloat
let closestPosition: CGFloat
if cardTopEdgeLocation <= bounds.height/2 {
positionAbove = bounds.height/7
positionBelow = bounds.height/2
} else {
positionAbove = bounds.height/2
positionBelow = bounds.height - (bounds.height/9)
}
if (cardTopEdgeLocation - positionAbove) < (positionBelow - cardTopEdgeLocation) {
closestPosition = positionAbove
} else {
closestPosition = positionBelow
}
if verticalDirection > 0 {
self.position = positionBelow
} else if verticalDirection < 0 {
self.position = positionAbove
} else {
self.position = closestPosition
}
}
}
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
}
}
}
