Unarchive custom object with secure coding in iOS - ios

Question

I'm encoding an array of objects that conform to NSSecureCoding successfully like this.
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array requiringSecureCoding:YES error:nil];
How do I unarchive this data? I'm trying like this but it's returning nil.
NSError *error = nil;
NSArray<MyClass *> *array = [NSKeyedUnarchiver unarchivedObjectOfClass:[NSArray class] fromData:data error:&error];
This is the error it returns.
The data couldn’t be read because it isn’t in the correct format.

Answer 1

Here is a simple example
#interface Secure:NSObject<NSSecureCoding> {
NSString* name;
}
#property NSString* name;
#end
#implementation Secure
#synthesize name;
// Confirms to NSSecureCoding
+ (BOOL)supportsSecureCoding {
return true;
}
- (void)encodeWithCoder:(nonnull NSCoder *)coder {
[coder encodeObject:self.name forKey: #"name"];
}
- (nullable instancetype)initWithCoder:(nonnull NSCoder *)coder {
self = [self init];
if (self){
self.name = [coder decodeObjectOfClass:[NSString class] forKey:#"name"];
}
return self;
}
#end
Usage
Secure *archive = [[Secure alloc] init];
archive.name = #"ARC";
NSArray* array = #[archive];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array requiringSecureCoding:YES error:nil];
NSArray<Secure *> *unarchive = [NSKeyedUnarchiver unarchivedObjectOfClass:[NSObject class] fromData:data error:nil];
NSLog(#"%#", unarchive.firstObject.name);