IOS: create an HTTP request queue offline

Question

I have an application that works with a server. I would like to do offline when the user creates something or changes it somewhere somewhere, and then when the Internet connection appears - these requests go to the server. How can i achieve this? How to store blocks in NSUserDefaults? How not to lose pointers to these blocks? These can be different controllers. Help me please. I apologize for my poor English. I tried to save these objects inNSUserDefaults

typedef void (^ExecutionBlock)(void);

@interface OfflineBlockObject : NSObject

@property (nonatomic, copy) ExecutionBlock block;
@property (nonatomic, strong) NSArray<NSMutableArray *> *operandsArray;
@property (nonatomic, strong) NSArray *conditionsArray;

@end

OfflineBlockObject *blockObject = [[OfflineBlockObject alloc] init];
        BOOL first = [self.reservation.reservationID boolValue];
        NSArray *conditions = @[@(first), @(self.shouldCallSetTagsForReservation)];
        NSArray *operands = @[@[[self.reservation json], self.reservation.reservationID ? : @0, self.selectedTags ? : @[]],
                              @[[self.reservation json], @(self.shouldForceApproved), self.selectedTags? : @[]]];
        blockObject.conditionsArray = [conditions copy];
        blockObject.operandsArray = [operands copy];
        @weakify(blockObject);
        blockObject.block = [^{
            @strongify(blockObject);
            if ([blockObject.conditionsArray[0] boolValue]) {
                ReservationsModel *m = [[ReservationsModel alloc] init];
                [m editReservation:blockObject.operandsArray[0][0] success:^(id responseObject) {
                    if ([blockObject.conditionsArray[1] boolValue]) {
                        [m setReservationTags:blockObject.operandsArray[0][1] tags:blockObject.operandsArray[0][2] success:nil failure:nil];
                    }
                } failure:nil];
            } else {
                self.reservation.eventId = self.reservationEvent.eventInfoID;

                ReservationsModel *m = [[ReservationsModel alloc] init];
                [m createReservation:blockObject.operandsArray[1][0] shouldForceApproved:[blockObject.operandsArray[1][1] boolValue] success:^(id responseObject) {
                    Reservation *reservation = [Reservation reservationWithJson:responseObject];
                    if (reservation.reservationID) {
                        if ([blockObject.conditionsArray[1] boolValue]) {
                            [m setReservationTags:reservation.reservationID tags:blockObject.operandsArray[0][2] success:nil failure:nil];
                        }
                    }
                } failure:nil];
            }
        } copy];
        [[OfflineQueueHelper sharedHelper] addTask:blockObject];

But my block property becomes null :(

Answer 1

, , , Swift (Obj-C ) - https://cocoapods.org/pods/OfflineRequestManager. , , , . , , , . - , , , - .

: ( , ..) :

import OfflineRequestManager

class SimpleRequest: OfflineRequest {
    func perform(completion: @escaping (Error?) -> Void) {
        doMyNetworkRequest(withCompletion: { response, error in
            handleResponse(response)
            completion(error)
        })
    }
}
///////
OfflineRequestManager.defaultManager(queueRequest: SimpleRequest())