#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end

#import "ViewController.h"#import "SubPage1ViewController.h"#import "SubPage2ViewController.h"@interface ViewController ()<UIPageViewControllerDataSource,UIPageViewControllerDelegate>@property NSArray *contentViewControllers; //ViewControllers@property (nonatomic, strong) UIPageViewController *pageViewController;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  [self pageViewController];}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}#pragma mark#pragma mark ----- UIPageViewControllerDataSource ------ (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{  NSUInteger index = [self indexForViewController:viewController];  if (index == 0) {    index = [self.contentViewControllers count] - 1;  } else {    index--;  }  return [self viewControllerAtIndex:index];}- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{  NSUInteger index = [self indexForViewController:viewController];  index++;  if (index == [self.contentViewControllers count]) {    index = 0;  }  return [self viewControllerAtIndex:index];}- (NSUInteger)indexForViewController:(UIViewController *)viewController{  return [self.contentViewControllers indexOfObject:viewController];}- (UIViewController *)viewControllerAtIndex:(NSUInteger)index{  if (index > [self.contentViewControllers count]) {    return nil;  }  UIViewController *vc = [self.contentViewControllers objectAtIndex:index];  return vc;}#pragma mark#pragma mark ----- UIPageViewControllerDelegate ------ (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers{}- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed{}#pragma mark#pragma mark Init- (UIPageViewController *)pageViewController{  if(!_pageViewController)  {    NSDictionary *options =[NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin]                              forKey: UIPageViewControllerOptionSpineLocationKey];    _pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll                               navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal                                      options:options];    [[_pageViewController view] setFrame:[[self view] bounds]];    _contentViewControllers = [NSMutableArray arrayWithObjects:[SubPage1ViewController new],[SubPage2ViewController new],nil];    // 設置UIPageViewController的配置項    [_pageViewController setViewControllers:[NSArray arrayWithObjects:_contentViewControllers[0], nil]                   direction:UIPageViewControllerNavigationDirectionForward                    animated:NO                   completion:nil];    _pageViewController.delegate = self;    _pageViewController.dataSource = self;    [self addChildViewController:self.pageViewController];    [self.view addSubview:self.pageViewController.view];  }  return _pageViewController;}