UIPageViewController不加载内容

Question

嗨，这是我第一次尝试使用UIPageViewController。我遵循了this教程，由于某种原因，PageContentViewController永远不会加载。我知道我可能会遗漏一些非常愚蠢的东西，所以我会欣赏一双清新的眼睛。

以下是我的故事板的截图：

这是充当PageViewController数据源的类

//
//  ViewController.m
//  Pregrancy
//
//  Created by Andreas Kaitis on 24/10/14.
//  Copyright (c) 2014 Andreas Kaitis. All rights reserved.
//

#import "ViewController.h"
#import "PageContentViewController.h"

@interface ViewController () 

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    _pageImages = [[NSArray alloc]initWithObjects:  @"week1", @"week2", @"week3", @"week4",
                                                    @"week5", @"week6", @"week7", @"week8",
                                                    @"week9", @"week10",@"week11",@"week12",
                                                    @"week13",@"week14",@"week15",@"week16",
                                                    @"week17",@"week18",@"week19",@"week20",
                                                    @"week21",@"week22",@"week23",@"week24",
                                                    @"week25",@"week26",@"week27",@"week28",
                                                    @"week29",@"week30",@"week31",@"week32",
                                                    @"week37",@"week38",@"week39",@"week40", nil];

    _pageTitles = [[NSArray alloc]initWithObjects:  @"Month 1", @"Month 1", @"Month 1", @"Month 1",
                                                    @"Month 2", @"Month 2", @"Month 2", @"Month 2",
                                                    @"Month 3", @"Month 3", @"Month 3", @"Month 3",
                                                    @"Month 4", @"Month 4", @"Month 4", @"Month 4",
                                                    @"Month 5", @"Month 5", @"Month 5", @"Month 5",
                                                    @"Month 6", @"Month 6", @"Month 6", @"Month 6",
                                                    @"Month 7", @"Month 7", @"Month 7", @"Month 7",
                                                    @"Month 8", @"Month 8", @"Month 8", @"Month 8",
                                                    @"Month 9", @"Month 9", @"Month 9", @"Month 9",nil];

    _pageSubtitles = [[NSArray alloc]initWithObjects:@"week1", @"week2", @"week3", @"week4",
                                                    @"week5", @"week6", @"week7", @"week8",
                                                    @"week9", @"week10", @"week11", @"week12",
                                                    @"week13", @"week14", @"week15", @"week16",
                                                    @"week17", @"week18", @"week19", @"week20",
                                                    @"week21", @"week22", @"week23", @"week24",
                                                    @"week25", @"week26", @"week27", @"week28",
                                                    @"week29", @"week30", @"week31", @"week32",
                                                    @"week33", @"week34", @"week35", @"week36",nil];

    _pageBodyText = [[NSArray alloc]initWithObjects:@"week1", @"week2", @"week3", @"week4",
                                                    @"week5", @"week6", @"week7", @"week8",
                                                    @"week9", @"week10", @"week11", @"week12",
                                                    @"week13", @"week14", @"week15", @"week16",
                                                    @"week17", @"week18", @"week19", @"week20",
                                                    @"week21", @"week22", @"week23", @"week24",
                                                    @"week25", @"week26", @"week27", @"week28",
                                                    @"week29", @"week30", @"week31", @"week32",
                                                    @"week33", @"week34", @"week35", @"week36",nil];

    // Create page view controller
    self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
    self.pageViewController.dataSource = self;

    PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    // Change the size of page view controller
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 30);

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{
    if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
        return nil;
    }

    // Create a new view controller and pass suitable data.
    PageContentViewController *pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageContentViewController"];
    pageContentViewController.imageFile = self.pageImages[index];
    pageContentViewController.titleText = self.pageTitles[index];
    pageContentViewController.subtitleText = self.pageSubtitles[index];
    pageContentViewController.bodyText = self.pageBodyText[index];
    pageContentViewController.pageIndex = index;

    return pageContentViewController;
}

- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
    return [self.pageTitles count];
}

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
    return 0;
}

#pragma mark - Page View Controller Data Source

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    NSUInteger index = ((PageContentViewController*) viewController).pageIndex;

    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }

    index--;
    return [self viewControllerAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    NSUInteger index = ((PageContentViewController*) viewController).pageIndex;

    if (index == NSNotFound) {
        return nil;
    }

    index++;
    if (index == [self.pageTitles count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
}


@end

和PageContentViewController

#import "PageContentViewController.h"

@interface PageContentViewController () <UITableViewDataSource, UITableViewDataSource>

@end

@implementation PageContentViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.imageView.image = [UIImage imageNamed:self.imageFile];
    self.monthLabel.text = self.titleText;
    self.weekLabel.text = self.subtitleText;
    self.bodyTextLabel.text = self.bodyText;

    self.monthVisualEffectView.hidden = YES;
    self.weekVisualEffectView.hidden = YES;


    self.months = [[NSArray alloc]initWithObjects:@"Month 1",@"Month 2",@"Month 3",@"Month 4",@"Month 5",@"Month 6",@"Month 7",@"Month 8",@"Month 9", nil];

    self.weeks = [[NSArray alloc]initWithObjects:  @"week 1", @"week 2",   @"week 3",  @"week 4",
                                                   @"week 5", @"week 6",   @"week 7",  @"week 8",
                                                   @"week 9", @"week 10",  @"week 11", @"week 12",
                                                   @"week 13", @"week 14", @"week 15", @"week 16",
                                                   @"week 17", @"week 18", @"week 19", @"week 20",
                                                   @"week 21", @"week 22", @"week 23", @"week 24",
                                                   @"week 25", @"week 26", @"week 27", @"week 28",
                                                   @"week 29", @"week 30", @"week 31", @"week 32",
                                                   @"week 33", @"week 34", @"week 35", @"week 36",nil];


}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}