71 lines
2.1 KiB
Swift
71 lines
2.1 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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