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SwiftUI Updating Environment and Sheets
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// | |
// ContentView.swift | |
// EnvTest | |
// | |
// Created by Kai Oelfke on 03.02.23. | |
// | |
import SwiftUI | |
struct Inner: View { | |
@Environment(\.myCustomValue) private var value | |
var body: some View { | |
Text("Inner Child: \(value)") | |
.transformEnvironment(\.myCustomValue, transform: { print("inner", $0) }) | |
} | |
} | |
struct SheetView: View { | |
@Environment(\.myCustomValue) private var value | |
var body: some View { | |
Text("Child Sheet: \(value)") | |
} | |
} | |
struct ContentView: View { | |
@State private var showSheet = true | |
var body: some View { | |
VStack { | |
Inner() | |
Button("Show sheet") { | |
showSheet = true | |
} | |
.sheet(isPresented: $showSheet) { | |
SheetView() | |
.transformEnvironment(\.myCustomValue, transform: { print("sheet", $0) }) | |
// Applying it inside makes updates available. | |
// .modifier(MyModifier()) | |
//.presentationDetents([.fraction(0.1)]) // to see both values | |
} | |
} | |
.modifier(MyModifier()) | |
} | |
} | |
struct MyModifier: ViewModifier { | |
@State var value = "Initial value from modifier" | |
@State var color: Color = .primary | |
func body(content: Content) -> some View { | |
content | |
.onAppear { | |
Task { | |
while true { | |
try? await Task.sleep(nanoseconds: NSEC_PER_SEC) | |
value = "value \((0...100).randomElement()!)" | |
color = [Color.blue, .red, .yellow, .orange, .green].randomElement()! | |
} | |
} | |
} | |
.myCustomValue(value) | |
.foregroundColor(color) | |
} | |
} | |
private struct MyEnvironmentKey: EnvironmentKey { | |
static let defaultValue: String = "Default value from Environment Key" | |
} | |
extension EnvironmentValues { | |
var myCustomValue: String { | |
get { self[MyEnvironmentKey.self] } | |
set { self[MyEnvironmentKey.self] = newValue } | |
} | |
} | |
extension View { | |
func myCustomValue(_ myCustomValue: String) -> some View { | |
environment(\.myCustomValue, myCustomValue) | |
} | |
} | |
struct ContentView_Previews: PreviewProvider { | |
static var previews: some View { | |
ContentView() | |
} | |
} |
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