how to stop/ start the game without the loss of time from app delegate?

i am trying to stop / start the game when the game goes to background due to pressing the home button, receiving a phone call etc.. i don't have the need to have a pause button in the scene so i didn't implement any pause methods but when the game gets interrupted by receiving a phone call i like to stop and start the game from the spot that was left. (i hope this explanation makes sense). currently i am using the following codes in my app delegate but it doesn't do what i want, i was wondering if there is a way to stop and start the game in app delegate so when the game goes to background all actions would stop and it would resume when the game would restart. here is my app delegate:

#import "AppDelegate.h"
#import <SpriteKit/SpriteKit.h>
@interface AppDelegate ()

@end

@implementation AppDelegate

- (SKView *)getGameView {
    NSArray *viewControllers = self.window.rootViewController.childViewControllers;
    for (UIViewController *vc in viewControllers) {
        if ([vc.view isKindOfClass:[SKView class]]) {
            SKView *view = (SKView *)vc.view;
            return view;
        }
    }
    return nil;
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

    SKView *view = [self getGameView];
    if (view) {
        view.paused = YES; //or NO
    }
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.


}

- (void)applicationWillEnterForeground:(UIApplication *)application {
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

    SKView *view = [self getGameView];
    if (view) {
        view.paused = NO; //or NO
    }
}

- (void)applicationWillTerminate:(UIApplication *)application {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end

i have tried a bunch of methods i found in SO but non of them offer a solution to my situation. i was wondering if anyone can offer some help.