Codable

UserDefaults Codable Wrapper¶

On iOS 12 and prior, primitive types (Int, Double, Bool, etc), while Codable as a property of a Codable type, cannot itself be JSON encodable. Trying encoding/decoding with these types on iOS 12 earlier platforms will throw an error. To remedy this behavior we wrap the Codable value in a simple Codable struct.

User Defaults example

@propertyWrapper

public struct UserDefaultsBacked<Value: Codable> {
private let key: String
private let defaultValue: Value
private let domain: UserDefaults
public var wrappedValue: Value { }

public init(key: String, defaultValue: Value, domain: UserDefaults = .standard) {
    self.key = key
    self.defaultValue = defaultValue
    self.domain = domain
}

struct Wrapper<Value>: Codable where Value: Codable {
    let value: Value
}




```swift
// Wrapped value
// GET
do {
    let wrappedValue = try JSONDecoder().decode(Wrapper<Value>.self, from: data)
    return wrappedValue.value
}

// SET
set {
    do {
        let data = try JSONEncoder().encode(Wrapper(value: newValue))
        domain.setValue(data, forKey: key)
    } catch {}
}