Created
November 5, 2020 03:26
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Property wrapper of keychain store
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| import Foundation | |
| import KeychainAccess | |
| //https://www.swiftbysundell.com/articles/property-wrappers-in-swift/ | |
| public protocol AnyOptional { | |
| var isNil: Bool { get } | |
| } | |
| extension Optional: AnyOptional { | |
| public var isNil: Bool { self == nil } | |
| } | |
| @propertyWrapper | |
| public struct KeychainStorage<T> where T: KeychainStorgaeDataAcceptable { | |
| let key: String | |
| let defaultValue: T | |
| let keychain: Keychain | |
| init(_ key: String, keychain: Keychain, defaultValue: T) { | |
| self.key = key | |
| self.defaultValue = defaultValue | |
| self.keychain = keychain | |
| } | |
| public var wrappedValue: T { | |
| get { | |
| if let value = keychain[key] as? T { | |
| return value | |
| } else { | |
| return defaultValue | |
| } | |
| } | |
| set { | |
| if let value = newValue as? AnyOptional, value.isNil { | |
| keychain[key] = nil | |
| } else { | |
| if let value = newValue as? Data { | |
| keychain[data: key] = value | |
| } else if let value = newValue as? String { | |
| keychain[string: key] = value | |
| } else { | |
| assertionFailure("Keychain should never store data other then String or Data type") | |
| } | |
| } | |
| } | |
| } | |
| } | |
| // see more: https://swiftbysundell.com/articles/property-wrappers-in-swift/ | |
| extension KeychainStorage where T: ExpressibleByNilLiteral { | |
| init(_ key: String, keychain: Keychain) { | |
| self.key = key | |
| self.defaultValue = nil | |
| self.keychain = keychain | |
| } | |
| } | |
| public protocol KeychainStorgaeDataAcceptable {} | |
| extension String: KeychainStorgaeDataAcceptable {} | |
| extension Data: KeychainStorgaeDataAcceptable {} | |
| extension Optional: KeychainStorgaeDataAcceptable where Wrapped: KeychainStorgaeDataAcceptable {} |
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