#import <UIKit/UIKit.h>

@protocol FirstViewControllerDelegate <NSObject>

- (void) setAutoModeTimer;

@end

@interface FirstViewController : UIViewController

@property (nonatomic,weak) id <FirstViewControllerDelegate> delegate;

@end

#import "FirstViewController.h"
#import "SecondViewController.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    SecondViewController * myViewController = [[SecondViewController alloc] init];
    [myViewController view];
    // Do any additional setup after loading the view, typically from a nib.
}

//- (void)loadView{[self.tabBarController.viewControllers makeObjectsPerformSelector:@selector(view)];}


- (IBAction)startTimerButtonPressed:(id)sender {

    [self.delegate setAutoModeTimer];

}
@end

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@end

#import "SecondViewController.h"
#import "FirstViewController.h"

@interface SecondViewController () <FirstViewControllerDelegate>

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    FirstViewController *firstVC = [self.storyboard instantiateViewControllerWithIdentifier:@"FirstViewController"];
    firstVC.delegate = self;

}

- (void) setAutoModeTimer
{
    NSLog(@"Timer has started");
}

@end