ViewController.m

@implementation ViewController

#pragma mark View Lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self createPageViewController];
    [self setupPageControl];
}

- (void)createPageViewController
{
    _contentImages = @[@"nature_pic_1",
                      @"nature_pic_2",
                      @"nature_pic_3",
                      @"nature_pic_4"];
    
    UIPageViewController *pageController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageController"];
    
    pageController.dataSource = self;
    
    if([_contentImages count])
    {
        NSArray *startingViewControllers = @[[self itemControllerForIndex:0]];
        [pageController setViewControllers:startingViewControllers
                                 direction:UIPageViewControllerNavigationDirectionForward
                                  animated:NO
                                completion:nil];
    }
    
    self.pageViewController = pageController;
    [self addChildViewController:self.pageViewController];
    [self.view addSubview:self.pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];
}

- (void)setupPageControl
{
    [[UIPageControl appearance] setPageIndicatorTintColor:[UIColor grayColor]];
    [[UIPageControl appearance] setCurrentPageIndicatorTintColor:[UIColor whiteColor]];
    [[UIPageControl appearance] setBackgroundColor:[UIColor darkGrayColor]];
}

@end