ios/objective c/singleton: Storing userid in session variable

Question

I defined an NSInteger in a singleton (for userid) and access it in another class. However, while I have managed to get rid of error messages so it builds, the app crashes when

Answer 1

Here is my standart session object

H file

@interface ControllerSession : NSObject
@property(nonatomic, strong) NSString* sID;
@property(nonatomic, strong) NSDate* sDate;

#pragma mark sharedInstance
+ (ControllerSession*)sharedInstance;

#pragma mark sessionVariables
- (void)sessionVariableAddWithName:(NSString*)name WithValue:(id)value;
- (id)sessionVariableGetWithName:(NSString*)name;

@end

M file

//
//  ControllerSession.m
//  FitTechs
//
//  Created by Add080bbA on 19/04/16.
//  Copyright © 2016 Dayamatron. All rights reserved.
//
#import "ControllerModel.h"
#import "ControllerSession.h"
#import "ControllerSystem.h"

//#import "includeListCategories.h"
#import "NSObject+AppDelegate.h"

@interface ControllerSession ()
@property(nonatomic, strong) ControllerSystem* ctrlSystem;
@property(nonatomic, strong) ControllerModel* ctrlModel;
@property(nonatomic, strong) Session* sessionEntity;
//+ (NSMutableDictionary*)sessionVariables;
@end

@implementation ControllerSession

@synthesize ctrlSystem;
@synthesize ctrlModel;
@synthesize sessionEntity;

@synthesize sID;
@synthesize sDate;

#pragma mark sharedInstance
static ControllerSession* objSelf;
+ (ControllerSession*)sharedInstance {
  if (!objSelf) {
    static dispatch_once_t onceTokenControllerSession;
    dispatch_once(&onceTokenControllerSession, ^{
      objSelf = [[ControllerSession alloc] init];
    });
  }
  return objSelf;
}

#pragma mark init
- (id)init {
  self = [super init];
  if (self) {
    ctrlModel = self.appdel.ctrlModel;
    ctrlSystem = self.appdel.ctrlSystem;

    // session CoreData Stuff to record permanently
    sessionEntity = [ctrlModel sessionCreateBlank];
    sessionEntity.systemOSVersion =
        [NSNumber numberWithFloat:ctrlSystem.osVersion];
    sessionEntity.systemLocale = ctrlSystem.localeCurrent;
    sessionEntity.systemHardware = ctrlSystem.hardware;
    sessionEntity.systemLanguagesPrefered =
        [ctrlSystem languagesPreferedCombinedWithString:@";"];
    sessionEntity.systemLanguageSelected = ctrlSystem.languageSelected;

    [ctrlModel saveContext];
  }
  return self;
}

#pragma mark sessionVariables
// session Temp Stuff to record
static NSMutableDictionary* sessionDict;
// singleton session dict object
- (NSMutableDictionary*)sessionDictGet {
  if (!sessionDict) {
    static dispatch_once_t onceTokensessionDictGet;
    dispatch_once(&onceTokensessionDictGet, ^{
      sessionDict = [[NSMutableDictionary alloc] init];
    });
  }
  return sessionDict;
}

- (void)sessionVariableAddWithName:(NSString*)name WithValue:(id)value {
  [self.sessionDictGet setObject:value forKey:name];
}
- (id)sessionVariableGetWithName:(NSString*)name {
  return [self.sessionDictGet objectForKey:name];
}

@end