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Add
@Default property wrapper for SwiftUI
Fixes sindresorhus#28
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| #if canImport(Combine) | ||
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| import SwiftUI | ||
| import Combine | ||
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| @available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *) | ||
| extension Defaults { | ||
| final class Observable<Value: Codable>: ObservableObject { | ||
| let objectWillChange = ObservableObjectPublisher() | ||
| private var observation: DefaultsObservation? | ||
| private let key: Defaults.Key<Value> | ||
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| var value: Value { | ||
| get { Defaults[key] } | ||
| set { | ||
| objectWillChange.send() | ||
| Defaults[key] = newValue | ||
| } | ||
| } | ||
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| init(_ key: Key<Value>) { | ||
| self.key = key | ||
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| self.observation = Defaults.observe(key, options: [.prior]) { [weak self] change in | ||
| guard change.isPrior else { | ||
| return | ||
| } | ||
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| DispatchQueue.mainSafeAsync { | ||
| self?.objectWillChange.send() | ||
| } | ||
| } | ||
| } | ||
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| /// Reset the key back to its default value. | ||
| func reset() { | ||
| key.reset() | ||
| } | ||
| } | ||
| } | ||
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| @available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *) | ||
| @propertyWrapper | ||
| public struct Default<Value: Codable>: DynamicProperty { | ||
| public typealias Publisher = AnyPublisher<Defaults.KeyChange<Value>, Never> | ||
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| private let key: Defaults.Key<Value> | ||
| @ObservedObject private var observable: Defaults.Observable<Value> | ||
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| /** | ||
| Get/set a `Defaults` item and also have the view be updated when the value changes. This is similar to `@State`. | ||
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| ``` | ||
| extension Defaults.Keys { | ||
| static let hasUnicorn = Key<Bool>("hasUnicorn", default: false) | ||
| } | ||
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| struct ContentView: View { | ||
| @Default(.hasUnicorn) var hasUnicorn | ||
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| var body: some View { | ||
| Text("Has Unicorn: \(hasUnicorn)") | ||
| Toggle("Toggle Unicorn", isOn: $hasUnicorn) | ||
| } | ||
| } | ||
| ``` | ||
| */ | ||
| public init(_ key: Defaults.Key<Value>) { | ||
| self.key = key | ||
| self.observable = Defaults.Observable(key) | ||
| } | ||
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| public var wrappedValue: Value { | ||
| get { observable.value } | ||
| nonmutating set { | ||
| observable.value = newValue | ||
| } | ||
| } | ||
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| public var projectedValue: Binding<Value> { $observable.value } | ||
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| /// Combine publisher that publishes values when the `Defaults` item changes. | ||
| public var publisher: Publisher { Defaults.publisher(key) } | ||
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| public mutating func update() { | ||
| _observable.update() | ||
| } | ||
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| /** | ||
| Reset the key back to its default value. | ||
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| ``` | ||
| extension Defaults.Keys { | ||
| static let opacity = Key<Double>("opacity", default: 1) | ||
| } | ||
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| struct ContentView: View { | ||
| @Default(.opacity) var opacity | ||
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| var body: some View { | ||
| Button("Reset") { | ||
| self._opacity.reset() | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
| */ | ||
| public func reset() { | ||
| key.reset() | ||
| } | ||
| } | ||
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| #endif |
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