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Questions tagged [nskeyedarchiver]

NSKeyedArchiver, a concrete subclass of NSCoder, provides a way to encode objects (and scalar values) into an architecture-independent format that can be stored in a file. When you archive a set of objects, the class information and instance variables for each object are written to the archive. NSKeyedArchiver’s companion class, NSKeyedUnarchiver, decodes the data in an archive and creates a set of objects equivalent to the original set.

NSKeyedArchiver, a concrete subclass of NSCoder, provides a way to encode objects (and scalar values) into an architecture-independent format that can be stored in a file. When you archive a set of objects, the class information and instance variables for each object are written to the archive. NSKeyedArchiver’s companion class, NSKeyedUnarchiver, decodes the data in an archive and creates a set of objects equivalent to the original set.

A keyed archive differs from a non-keyed archive in that all the objects and values encoded into the archive are given names, or keys. When decoding a non-keyed archive, values have to be decoded in the same order in which they were encoded. When decoding a keyed archive, because values are requested by name, values can be decoded out of sequence or not at all. Keyed archives, therefore, provide better support for forward and backward compatibility.

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How to load an Objective C Singleton using NSCoding?

I am writing a basic game, I am using a GameStateManager which is a singleton and handles all state management, such as saves, loads, delete methods. I have a separate singelton which handles all the Game stuff. The game object is inside the game…
zardon
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Unarchiving UIImageView with subviews

I'm going a bit crazy trying to archive and unarchive a UIImageView which has number of subviews which are custom views derived from UIImageView. Here's what I've done: Add a category to the project to allow for the fact that UIImage does not…
beev
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Initializing a static singleton object with NSCoder

I'm working on an iPhone app and facing some troubles with my shared singleton class. I'm using a shared singleton to store two variables int gameRuns and int totalScore 'gamRuns' just increments every time the user loads the app, and 'totalScore'…
Mostafa Berg
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NSCoding NSKeyedUnarchiver unarchiveObjectWithFile: returning null

I am trying to save some values from my app using NSCoding. I'm able to save the value but not able to retrieve it. Here's where I am declaring the protocol: @interface AddReminderEventViewController : UIViewController
Jazzmine
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Saving [UIColor colorWithPatternImage:image] UIColor to Core Data using NSKeyedArchiver

I'm unable to create an NSData object from a UIColor (with a pattern) created with the factory method [UIColor colorWithPatternImage:image] works fine for standard UIColor objects. Wondering if there is another way to save a UIColor with a pattern…
Nate Potter
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Encode/decode NSCoder data in C++

I'd like to send serialized objects between a C++ application (running on a linux machine) and an iPhone application. Is this possible? Is there a way to encode/decode data using the NSCoding protocol on the C++ side? Has someone reverse engineered…
jonas
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How to read file as String in Flutter that has been written to filesystem using NSKeyedArchiver in iOS?

After updating iOS native app with an app written on Flutter I want to read a file from filesystem on iOS device using Dart. The file I want to read has been previously written to filesystem using this ObjectiveC code: -…
Sergio
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Singleton does not persist from app delegate into another view controller

Following this link: How do I archive two objects using NSKeyedArchiever? I am able to archieve an array and a singleton object. I can archieve and correctly unarchieve it at didFinishLaunchingWithOptions. However, my singleton object does not…
oky_sabeni
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iOS: Appending to an archive

Can anyone recommend a memory-efficient way to append data to an archive using NSKeyArchiver? I have an array which collects objects and makes them available to the app as an in-memory cache. In order to avoid eating more and more memory, I'd like…
100grams
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Limitations of NSMutableData for NSKeyedUnarchiver

I have read on another post (Archiving / Unarchiving results in initForReadingWithData incomprehensible archive) that you can't store more than 250kBytes on a NSMutableArray. Unfortunately, in order to recover such data with NSKeyedUnarchiver, you…
Plot
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Extracting Data from NSKeyedArchiver in Non-ARC Code

In my non-ARC iOS project, I have a method that returns archived data: - (NSData*) archivedData { NSMutableData* data = [[NSMutableData alloc] init]; NSKeyedArchiver* archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; …
THLO
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NSKeyedUnarchiver.unarchiveTopLevelObjectWithData return nil

I want to save an array of objects into UserDefaults and load it back. When trying to unarchive the data it always returns nil.. any idea? This is my object: class DbInsideLevel: NSObject, NSSecureCoding { static var supportsSecureCoding:…
ytpm
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NSKeyedUnarchiver unarchivedObjectOfClass implementation gives error

I am updating an old Objective C app that uses 'NSKeyedUnarchiver unarchiveObjectWithData' which is now deprecated. The app archives an array consisting of custom objects that contain (among other things) another array of a different custom object.…
Bob
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NSKeyedArchiver Unable to Save or Load Data When Trying to Persist Data in Swift

I've been working on a basic iOS Food Tracker using Apple's Developer tutorial. When I got to the "Persisting Data" step, I realized that the functions used have been deprecated, so I've searched online to find the updated/working version. I've…
JennyW23
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NSKeyedArchiver deprecated method problem

Just a little background info. I lost my ability to speak a few years ago and learned how to code specifically to make a good text to speech app for myself. Amazingly a lot of others find it useful. Apple reports around 15,000 sessions per week. It…
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