Created
October 15, 2016 13:40
-
-
Save ryuichis/f98f0b725156e15638982458b4a6ba8f to your computer and use it in GitHub Desktop.
Swift 3 Struct & NSCoding
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| public struct Event { | |
| public internal(set) var timeStamp: Date | |
| public internal(set) var eventTag: String | |
| public init(timeStamp: Date, tag: String) { | |
| self.timeStamp = timeStamp | |
| self.eventTag = tag | |
| } | |
| } | |
| extension Event { | |
| class Coding: NSObject, NSCoding { | |
| let event: Event? | |
| init(event: Event) { | |
| self.event = event | |
| super.init() | |
| } | |
| required init?(coder aDecoder: NSCoder) { | |
| guard let timeStamp = aDecoder.decodeObject(forKey: "timeStamp") as? Date, | |
| let eventTag = aDecoder.decodeObject(forKey: "eventTag") as? String else { | |
| return nil | |
| } | |
| event = Event(timeStamp: timeStamp, tag: eventTag) | |
| super.init() | |
| } | |
| public func encode(with aCoder: NSCoder) { | |
| guard let event = event else { | |
| return | |
| } | |
| aCoder.encode(event.timeStamp, forKey: "timeStamp") | |
| aCoder.encode(event.eventTag, forKey: "eventTag") | |
| } | |
| } | |
| } | |
| extension Event: Encodable { | |
| var encoded: Decodable? { | |
| return Event.Coding(event: self) | |
| } | |
| } | |
| extension Event.Coding: Decodable { | |
| var decoded: Encodable? { | |
| return self.event | |
| } | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var session1 = Session(startTime: Date(), endTime: Date()) | |
| session1.events.append(Event(timeStamp: Date(), tag: "test session1/event1")) | |
| session1.events.append(Event(timeStamp: Date(), tag: "test session1/event2")) | |
| var session2 = Session(startTime: Date(), endTime: Date()) | |
| session2.events.append(Event(timeStamp: Date(), tag: "test session2/event1")) | |
| session2.events.append(Event(timeStamp: Date(), tag: "test session2/event2")) | |
| session2.events.append(Event(timeStamp: Date(), tag: "test session2/event3")) | |
| let sessions: [Session] = [session1, session2] | |
| let data = NSKeyedArchiver.archivedData(withRootObject: sessions.encoded) | |
| let back = (NSKeyedUnarchiver.unarchiveObject(with: data) as? [Session.Coding])?.decoded | |
| print(back ?? "error in getting back sessions") | |
| /* | |
| [ | |
| Session( | |
| startTime: 2016-10-15 13:34:45 +0000, | |
| endTime: Optional(2016-10-15 13:34:45 +0000), | |
| events: [ | |
| Event(timeStamp: 2016-10-15 13:34:45 +0000, eventTag: "test session1/event1"), | |
| Event(timeStamp: 2016-10-15 13:34:45 +0000, eventTag: "test session1/event2")]), | |
| Session( | |
| startTime: 2016-10-15 13:34:45 +0000, | |
| endTime: Optional(2016-10-15 13:34:45 +0000), | |
| events: [ | |
| Event(timeStamp: 2016-10-15 13:34:45 +0000, eventTag: "test session2/event1"), | |
| Event(timeStamp: 2016-10-15 13:34:45 +0000, eventTag: "test session2/event2"), | |
| Event(timeStamp: 2016-10-15 13:34:45 +0000, eventTag: "test session2/event3")])] | |
| */ |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| protocol Encodable { | |
| var encoded: Decodable? { get } | |
| } | |
| protocol Decodable { | |
| var decoded: Encodable? { get } | |
| } | |
| extension Sequence where Iterator.Element: Encodable { | |
| var encoded: [Decodable] { | |
| return self.filter({ $0.encoded != nil }).map({ $0.encoded! }) | |
| } | |
| } | |
| extension Sequence where Iterator.Element: Decodable { | |
| var decoded: [Encodable] { | |
| return self.filter({ $0.decoded != nil }).map({ $0.decoded! }) | |
| } | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| public struct Session { | |
| public internal(set) var startTime: Date | |
| public internal(set) var endTime: Date? | |
| public internal(set) var events: [Event] | |
| public init(startTime: Date, endTime: Date?) { | |
| self.startTime = startTime | |
| self.endTime = endTime | |
| self.events = [] | |
| } | |
| } | |
| extension Session { | |
| class Coding: NSObject, NSCoding { | |
| let session: Session? | |
| init(session: Session) { | |
| self.session = session | |
| super.init() | |
| } | |
| required init?(coder aDecoder: NSCoder) { | |
| guard let startTime = aDecoder.decodeObject(forKey: "startTime") as? Date, | |
| let endTime = aDecoder.decodeObject(forKey: "endTime") as? Date?, | |
| let events = aDecoder.decodeObject(forKey: "events") as? [Event.Coding] else { | |
| return nil | |
| } | |
| var decodedSession = Session(startTime: startTime, endTime: endTime) | |
| decodedSession.events = events.decoded as! [Event] | |
| session = decodedSession | |
| super.init() | |
| } | |
| public func encode(with aCoder: NSCoder) { | |
| guard let session = session else { | |
| return | |
| } | |
| aCoder.encode(session.startTime, forKey:"startTime") | |
| aCoder.encode(session.endTime, forKey:"endTime") | |
| aCoder.encode(session.events.encoded, forKey:"events") | |
| } | |
| } | |
| } | |
| extension Session: Encodable { | |
| var encoded: Decodable? { | |
| return Session.Coding(session: self) | |
| } | |
| } | |
| extension Session.Coding: Decodable { | |
| var decoded: Encodable? { | |
| return self.session | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment