cocoa - unarchivedObjectOfClass does not call initWithCoder - objective-c

Question

I am developing a macOS app using objective-C.
I tried to save a NSArray object in Core Data. I write
- (id)reverseTransformedValue:(id)value
{
return [NSKeyedUnarchiver unarchivedObjectOfClass:[NSArray class] fromData:value error:nil];
}
in the class that inherits NSValueTransformer.
And one of elements in my NSArray object is not of primary kind(which has properties called courseName and courseInfos), so I conform in this element's class. In this class ,I write:
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [[self class] new];
if (self = [super init])
{
self.courseName = [aDecoder decodeObjectForKey:#"courseName"];
self.courseInfos = [aDecoder decodeObjectForKey:#"courseInfos"];
}
return self;
}
When my apps runs, the reverseTransformedValue: method is called, and all elements but that special nonprimary element in my NSArray object are decoded. I put a breakpoint in the initWithCoder: method in that special element's class, and it never runs. I use some tools and find that element is successfully stored in my core data, so its encoding process has no problem.

Answer 1

I Fixed it, here is the solution:
My object is 'Address' (note: it is not NSArray)
Address.h
#interface Address : NSObject <NSSecureCoding>
#property (nonatomic, strong) NSString *street;
#property (nonatomic, strong) NSString *city;
#end
Address.m
#implementation Address
- (id) initWithCoder:(NSCoder *)aDecoder
{
self = [self init];
if (self == nil)
{
return nil;
}
self.street = [aDecoder decodeObjectOfClass:[Address class] forKey:#"street"];
self.city = [aDecoder decodeObjectOfClass:[Address class]
forKey:#"city"];
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:self.street forKey:#"street"];
[encoder encodeObject:self.city forKey:#"city"];
}
+ (BOOL)supportsSecureCoding
{
return YES;
}
Archive.h
#property (nonatomic, strong) Address *address;
Archive.m
UserDBO *userDBO = [[UserDBO alloc] init];
// Archive
NSError *error = nil;
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:self.address requiringSecureCoding:YES error:&error];
if(error)
{
NSLog(#"archivedDataWithRootObject: %#", error);
}
userDBO.address = data;
// UnArchive
Address *address = [NSKeyedUnarchiver unarchivedObjectOfClass:[Address class] fromData:userDBO.address error:&error];
if(error)
{
NSLog(#"unarchivedObjectOfClass: %#", error);
}
UserDBO.h
#property (nonatomic, strong) NSData *address;