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@bermudalocket
Last active August 29, 2023 00:47
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import Combine
import Foundation
let preferenceKey = "com.bermudalocket.myapp"
@propertyWrapper
struct Persistable<T> {
let key: String
let publisher: CurrentValueSubject<T, Never>
var projectedValue: Persistable<T> { return self }
var wrappedValue: T {
get {
self.publisher.value
}
set {
publisher.send(newValue)
UserDefaults.standard.set(newValue, forKey: self.key)
}
}
init(_ key: String, defaultValue: T) {
self.key = "\(preferenceKey).\(key)"
var value: T = defaultValue
if let currentValue = UserDefaults.standard.object(forKey: self.key) as? T {
value = currentValue
}
self.publisher = CurrentValueSubject<T, Never>(value)
}
}
class Preferences {
static let shared = Preferences()
@Persistable("blur", defaultValue: 10) var blur: Double
@Persistable("vibrancy", defaultValue: 17.5) var vibrancy: Double
@Persistable("tint", defaultValue: .someEnumValue) var tint: SomeEnumType
}
class SomePreferenceImplClass {
var cancellables = [Cancellable]()
var blur: Double
init() {
let cancellable = Preferences.shared.$blur.publisher.sink(receiveValue: { blur in
self.blur = blur
})
self.cancellables.append(cancellable)
}
deinit {
self.cancellables.forEach { $0.cancel() }
}
}
@JustinGanzer
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Crashes as well when optionals are used since you can not set userdefaults to nil, though that's easy to circumvent with the widely adopted AnyOptional protocol.

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