An example base class for View Controllers

BaseViewController.h

//
// ___FILENAME___
// ___PROJECTNAME___
//
// Created by ___FULLUSERNAME___ on ___DATE___.
//___COPYRIGHT___
//

#import <UIKit/UIKit.h>

@interface BaseViewController : UIViewController

- (void)commonInitializer;

@end

BaseViewController.m

//
//  ___FILENAME___
//  ___PROJECTNAME___
//
//  Created by ___FULLUSERNAME___ on ___DATE___.
//___COPYRIGHT___
//

#import "BaseViewController.h"

@interface BaseViewController ()

@end

@implementation BaseViewController

#pragma mark - Initializer

- (instancetype)init {
    self = [super init];
    if (self) {
        [self commonInitializer];
    }
    return self;
}

- (void)commonInitializer {
  // Overwrite in subclasses
}

#pragma mark - Lifecycle Events

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

#pragma mark - Navigation & Status Bar

- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

@end