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feat: add propertywrapper to userdefaults
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88 changes: 88 additions & 0 deletions
88
Sources/CombineExtensionUserDefaults/UserDefaults/DefaultsStorage.swift
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Original file line number | Diff line number | Diff line change |
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// | ||
// File.swift | ||
// | ||
// | ||
// Created by amine on 27/12/2022. | ||
// | ||
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import Combine | ||
#if canImport(SwiftUI) | ||
import SwiftUI | ||
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/// A property wrapper type that reflects a value from `UserDefaults` and | ||
/// invalidates a view on a change in value in that user default. | ||
@frozen @propertyWrapper | ||
public struct DefaultsStorage<Value: PropertyListValue>: DynamicProperty { | ||
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@ObservedObject private var _value: DefaultsObservationStorage<Value> | ||
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private init( | ||
value: Value, | ||
userDefaults: UserDefaults = .standard, | ||
key: UserDefaultsKey | ||
) { | ||
_value = DefaultsObservationStorage( | ||
defaultValue: value, | ||
key: key, | ||
userDefaults: userDefaults | ||
) | ||
} | ||
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public var wrappedValue: Value { | ||
get { | ||
_value.value | ||
} | ||
nonmutating set { | ||
_value.value = newValue | ||
} | ||
} | ||
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public var projectedValue: Binding<Value> { | ||
Binding( | ||
get: { self.wrappedValue }, | ||
set: { self.wrappedValue = $0 } | ||
) | ||
} | ||
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public var publisher: AnyPublisher<Value, Never> { | ||
_value.publisher | ||
} | ||
} | ||
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@usableFromInline | ||
final class DefaultsObservationStorage<T: PropertyListValue>: NSObject, ObservableObject { | ||
var defaultValue: T | ||
let key: UserDefaultsKey | ||
var isDisposed: Bool = false | ||
var userDefaults: UserDefaults | ||
var value: T { | ||
get { userDefaults.value(forKey: key.rawValue) as? T ?? defaultValue } | ||
set { userDefaults.setValue(newValue, forKey: key.rawValue) } | ||
} | ||
var publisher: AnyPublisher<T, Never> { subject.eraseToAnyPublisher() } | ||
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private var subject: CurrentValueSubject<T, Never> | ||
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init( | ||
defaultValue: T, | ||
key: UserDefaultsKey, | ||
userDefaults: UserDefaults = .standard | ||
) { | ||
self.defaultValue = defaultValue | ||
self.key = key | ||
self.userDefaults = userDefaults | ||
self.subject = CurrentValueSubject(defaultValue) | ||
super.init() | ||
self.userDefaults.addObserver(self, forKeyPath: key.rawValue, options: [.new], context: nil) | ||
} | ||
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// swiftlint:disable block_based_kvo | ||
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context _: UnsafeMutableRawPointer?) { | ||
guard let change = change, object != nil, keyPath == key.rawValue else { return } | ||
let newValue = change[.newKey] as? T | ||
subject.send(newValue ?? defaultValue) | ||
} | ||
// swiftlint:enable block_based_kvo | ||
} | ||
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#endif |
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