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https://github.com/nmdias/DefaultsKit

Simple, Strongly Typed UserDefaults for iOS, macOS and tvOS
https://github.com/nmdias/DefaultsKit

ios macos swift swift-framework swift4 tvos userdefaults

Last synced: 3 months ago
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Simple, Strongly Typed UserDefaults for iOS, macOS and tvOS

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README 

          
![DefaultsKit](/DefaultsKit.png?raw=true)



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[็ฎ€ไฝ“ไธญๆ–‡](README.zh-CN.md)



DefaultsKit is a lightweight Swift library that builds on [Codable](https://developer.apple.com/documentation/swift/codable) to offer a **Simple**, **Strongly Typed** and compact wrapper for [UserDefaults](https://developer.apple.com/documentation/foundation/userdefaults). With fewer than 100 lines of code, itโ€™s both easy to use and highly efficient.



Installation >> [`instructions`](https://github.com/nmdias/DefaultsKit/blob/master/INSTALL.md) <<



## Usage



Instantiate, or get a `shared` instance of `Defaults`



```swift

let defaults = Defaults() // or Defaults.shared

```



Then:



```swift

// Define a key

let key = Key("someKey")



// Set a value

defaults.set("Codable FTW ๐Ÿ˜ƒ", for: key)



// Read the value back

defaults.get(for: key) // Output: Codable FTW ๐Ÿ˜ƒ

```



### Check if a key has a value:



```swift

if defaults.has(key) {

    // Do your thing

}

```



> If you just need to know that a key/value pair exists, **without actually using the value**, use the `has()` method instead of the optional `get(for:key)`. For complex objects it will prevent any unnecessary deserialization.



### Implicit Member Expression



You can find a convenience wrapper for your keys by extending `DefaultsKey`. This allows you use [Implicit Member Expression](https://docs.swift.org/swift-book/ReferenceManual/Expressions.html#//appleref/swift/grammar/implicit-member-expression):



```swift

// Extend with a custom key

extension DefaultsKey {

    static var someKey: Key { Key("someKey") }

}



// Then use it like this

defaults.set("Some key", for: .someKey)

defaults.get(for: .someKey) // Output: Some key

```



### Complex objects



To store a complex object just conform to the [Codable](https://developer.apple.com/documentation/swift/codable) protocol:



```swift

struct Person: Codable {

    let name: String

    let age: Int

}

```



Then:



```swift

// Create a key

let key = Key("personKey")



// Get an instance of your Codable conforming enum, struct or class

let person = Person(name: "Bonnie Greenwell", age: 80)



// Set the value

defaults.set(person, for: key)

```



And finally:



```swift

// Read it back

let person = defaults.get(for: key)

person?.name // Bonnie Greenwell

person?.age  // 80

```



### Nested Objects



You can also use nested objects as long as they conform to the `Codable` protocol:



```swift

enum Pet: String, Codable {

    case cat

    case dog

}



struct Person: Codable {

    let name: String

    let pets: [Pet]

}



// Get a Codable conforming instante

let person = Person(name: "Claire", pets: [.cat])



// Set the value

defaults.set(person, for: key)



// And read it back

let person = defaults.get(for: key)

person?.name        // Claire

person?.pets.first  // cat

```



## License



DefaultsKit is released under the MIT license. See [LICENSE](https://github.com/nmdias/DefaultsKit/blob/master/LICENSE) for details.



### Help Wanted



#### Review/Translate [README.zh-CN.md](README.zh-CN.md) to Chinese



Chinese is the #1 spoken language in the world and I'd love to have DefaultsKit be more inclusive, unfortunately I don't speak Chinese. If you know chinese, and would like to help out, please see [issue #1](https://github.com/nmdias/DefaultsKit/issues/1)



Thank you ๐Ÿ™