62 lines
1.6 KiB
Swift
62 lines
1.6 KiB
Swift
//
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// Copyright 2021-2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only
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// Please see LICENSE in the repository root for full details.
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//
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// Taken from https://www.swiftbysundell.com/articles/property-wrappers-in-swift/
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import Foundation
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@propertyWrapper
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struct UserDefault<Value> {
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private let key: String
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private let defaultValue: Value
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private let storage: UserDefaults
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init(key: String, defaultValue: Value, storage: UserDefaults = .standard) {
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self.defaultValue = defaultValue
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self.key = key
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self.storage = storage
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}
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var wrappedValue: Value {
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get {
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let value = storage.value(forKey: key) as? Value
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return value ?? defaultValue
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}
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set {
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if let optional = newValue as? AnyOptional, optional.isNil {
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storage.removeObject(forKey: key)
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} else {
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storage.setValue(newValue, forKey: key)
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}
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let tmpKey = key
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .userDefaultValueUpdated,
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object: tmpKey)
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}
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}
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}
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}
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extension UserDefault where Value: ExpressibleByNilLiteral {
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init(key: String, storage: UserDefaults = .standard) {
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self.init(key: key, defaultValue: nil, storage: storage)
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}
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}
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private protocol AnyOptional {
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var isNil: Bool { get }
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}
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extension Optional: AnyOptional {
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var isNil: Bool { self == nil }
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}
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extension Notification.Name {
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static let userDefaultValueUpdated = Notification.Name("userDefaultValueUpdated")
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}
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