UIPageViewController demo笔记

//
//  ViewController.m
//  PageViewTest
//

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

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _pageTitles = @[@"Over 200 Tips and Tricks", @"Discover Hidden Features", @"Bookmark Favorite Tip", @"Free Regular Update"];
    _pageImages = @[@"page1.png", @"page2.png", @"page3.png", @"page4.png"];
    
    // 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:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
    
    self.pageViewController.view.frame = CGRectMake(0,0, self.view.frame.size.width, self.view.frame.size.height);
    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.view bringSubviewToFront:_startAgainButton];
    [self.pageViewController didMoveToParentViewController:self];
}

- (IBAction)startWalkthrough:(id)sender {
    PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionReverse animated:NO completion:nil];
}


-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    NSUInteger index = ((PageContentViewController *)viewController).pageIndex;
    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }
    index -= 1;
    return [self viewControllerAtIndex:index];
}

-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    NSUInteger index = ((PageContentViewController *)viewController).pageIndex;
    if (index == NSNotFound) {
        return nil;
    }
    index += 1;
    if (index == [self.pageTitles count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
}

-(PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{
    if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
        return nil;
    }
    PageContentViewController *pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageContentViewController"];
    pageContentViewController.imageFile = self.pageImages[index];
    pageContentViewController.titleText = self.pageTitles[index];
    pageContentViewController.pageIndex = index;
    return pageContentViewController;
}

// 实现下面的两个方法才能显示地步的页面指示。颜色区分在AppDelegate中设定。同时点击底部的左右两侧也会前后翻页。注释掉则不会

//- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
//{
//    return [self.pageTitles count];
//}
//
//-(NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
//{
//    return 0;
//}
@end

//
//  PageContentViewController.m
//

#import "PageContentViewController.h"

@interface PageContentViewController ()

@end

@implementation PageContentViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.titleLabel setText:self.titleText];
    [self.view bringSubviewToFront:self.titleLabel];
    [self.backgroundImageView setImage:[UIImage imageNamed:self.imageFile]];
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end