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NSCoding data not saved when returning to the app?


NSCoding data not saved when returning to the app?

By : Knyazushka
Date : November 17 2020, 01:00 AM
like below fixes the issue I don't understand why previousArrays returns (null), I would like to save a class containing a bezier path and its color. , I had to use this : if ( previousArray == nil ) ...
code :
NSMutableArray *previousArray = [[NSKeyedUnarchiver unarchiveObjectWithData:previousData] mutableCopy];
if ( previousArray == nil ) previousArray = [[NSMutableArray alloc] init];


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NSCoding NSKeyedUnarchiver unarchiveObjectWithFile: returning null

NSCoding NSKeyedUnarchiver unarchiveObjectWithFile: returning null


By : Source Code
Date : March 29 2020, 07:55 AM
wish helps you The path where you save and load your reminder is wrong. Maybe replace to this
code :
NSString *reminderEventIDsPathString = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"ReminderIDs.archive"];
NSCoding gamedata not saved swift

NSCoding gamedata not saved swift


By : user3535517
Date : March 29 2020, 07:55 AM
this one helps. Like Jozsef said, I forgot to decode the data. However I need to decode each of the individual variables and then copy it over to the GameData for it to work.
Here's
code :
class GameData : NSObject, NSCoding {

/// Data to save

var variableC : Int! = 3

/// Create of shared instance

class var sharedInstance: GameData {

    struct Static {
        static var instance: GameData?
        static var token: dispatch_once_t = 0
    }

    dispatch_once(&Static.token) {
        var gamedata = GameData()
        if let savedData = GameData.loadGame() {
            gamedata.variableC = savedData.variableC
        }
        Static.instance = gamedata
    }

    return Static.instance!
}

override init() {
    super.init()
}

required init(coder: NSCoder) {
    super.init()
    self.variableC = coder.decodeObjectForKey("variableC") as? Int

}

func encodeWithCoder(coder: NSCoder) {
    coder.encodeObject(GameData.sharedInstance.variableC, forKey: "variableC")
}

class func loadGame() -> GameData? {
    // load existing high scores or set up an empty array
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
    let documentsDirectory = paths[0] as! String
    let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist")
    let fileManager = NSFileManager.defaultManager()

    // check if file exists
    if !fileManager.fileExistsAtPath(path) {
        // create an empty file if it doesn't exist
        println("File doesn't exist")
        if let bundle = NSBundle.mainBundle().pathForResource("DefaultFile", ofType: "plist") {
            fileManager.copyItemAtPath(bundle, toPath: path, error:nil)
        }
    }

    if let rawData = NSData(contentsOfFile: path) {
        // do we get serialized data back from the attempted path?
        // if so, unarchive it into an AnyObject, and then convert to an array of HighScores, if possible
        if let data = NSKeyedUnarchiver.unarchiveObjectWithData(rawData) as? GameData {
            println("We loaded the data!")
            return data
        }
    }
    return nil
}

func save() {
    // find the save directory our app has permission to use, and save the serialized version of self.scores - the HighScores array.
    let saveData = NSKeyedArchiver.archivedDataWithRootObject(GameData.sharedInstance);
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray;
    let documentsDirectory = paths.objectAtIndex(0)as! NSString;
    let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist");

    saveData.writeToFile(path, atomically: true);
}
PINCache objectForKey returning NSCoding and can't casting it

PINCache objectForKey returning NSCoding and can't casting it


By : Dronic X
Date : March 29 2020, 07:55 AM
wish helps you It looks like PINCache is not defining the return types of the synchronous objectForKey: methods as __nullable. Without that Swift doesn't know that the return type is optional.
I submitted a PR, which has already been accepted, that should fix the problem. You should now be able to do something like:
code :
let trucksCached: AnyObject? = PINDiskCache.sharedCache().objectForKey("truck_key")
if let _truck = trucksCached as? Truck {
    print(_truck)
}
Swift NSKeyedArchiver: Do custom members of an NSCoding-conformant class need to conform to NSCoding as well?

Swift NSKeyedArchiver: Do custom members of an NSCoding-conformant class need to conform to NSCoding as well?


By : paulhewett
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The answer is "yes". Custom object members must also conform to NSCoding.
Why is NSCoding unable to decode an object once saved properly?

Why is NSCoding unable to decode an object once saved properly?


By : user3585584
Date : March 29 2020, 07:55 AM
With these it helps Here is the full class I am saving in core data as a transformable. , Key value coding-compliant properties must be marked as @objc dynamic
code :
@objcMembers
public class Item: NSObject, NSCoding {
    dynamic public var imageData: Data
    dynamic public var title: String
    dynamic public var keywords: [String]
    dynamic public var date: Date

...
public required convenience init?(coder aDecoder: NSCoder) {
    self.init(
        imageData: (aDecoder.decodeObject(forKey: "imageData") as? Data) ?? Data(),
        title: (aDecoder.decodeObject(forKey: "title") as? String) ?? "",
        date: Date(timeIntervalSince1970: aDecoder.decodeDouble(forKey: "date")),
        keywords: aDecoder.decodeObject(forKey: "keywords") as? [String] ?? [])
}
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