StorablePropertyWrapper

A swift property wrapper for type safe storing objects in Key-Value stores. Perfecctly tailored for UserDefaults and usable for SwiftUI bindings

Define your storable properties as usual and prepend them with the @Storable keyword. As any other property wrapper it supports static and non static properties.

class MyStorableValuesContainer {

    @Storable(key: "myStorableValueStringKey", default: "Hello")
    static var myStorableValueString: String

    @Storable(key: "myStorableValueBoolKey", default: false)
    static var myStorableBoolValue: Bool

    @Storable(key: "myStorableValueDateKey", default: nil)
    var myStorableDateValue: Date?

}

Many standard types are supported by default and also containers of those types are supported, like arrays and dictionaries. Enums with raw values of those standard types are also supported.

If you want to store types that support Codabe, you only need to tag your type with support to StorableCodableValue protocol and the property wraper takes care of all the coding and decoding.

struct MyStruct: Codable {
    var name: String
    var date: Date
}

extension MyStruct: StorableCodableValue {}

…

class MyCustomStoreContainer {

    @Storable(key: "myStorableValueKey", default: nil)
    var myStruct: MyStruct?

}

@Storable is not only usable with UserDefaults, it's store agnostic and you can add support for other Key-Value stores. Just implement the protocol KeyStore in you Key-Value store and add the store instence in the @Storable construstor like this:

extension MyKeyValueStore: KeyStore {
... Implement the KeyStore protocol required methods ...
}

let store: MyKeyValueStore = MyKeyValueStore()

class MyCustomStoreContainer {

    @Storable(key: "myStorableValueStringKey", default: "Hello", store: store)
    var myStorableValueString: String
    
    …
}

If you want to delete the value stored in the Key-Value store, @Storeable allow access to the wrapped value through ${property} calling the method remove() like this:

class MyCustomStoreContainer {

    @Storable(key: "myStorableValueStringKey", default: "Hello", store: store)
    static var myStorableValueString: String
    
    …
}

MyCustomStoreContainer.$myStorableValueString.remove()

@Storeable also send notifications for will/did change specific for each property so you can react to changes of all individual properties.

let token = NotificationCenter.default.addObserver( forName: MyCustomStoreContainer.$myStorableValueString.willChangeNotification, object: nil, queue: nil ) { notification in
  // React to will change 
}

let token = NotificationCenter.default.addObserver( forName: MyCustomStoreContainer.$myStorableValueString.didChangeNotification, object: nil, queue: nil ) { notification in
  // React to did change 
}

You can use the Swift Package Manager by declaring StorablePropertyWrapper as a dependency in your Package.swift file:

.package(url: "https://github.com/tapsandswipes/StorablePropertyWrapper", from: "1.0.0")

For more information, see the Swift Package Manager documentation.

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Copyright (c) 2020 Antonio Cabezuelo Vivo

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.