UIPageViewController 实现从中间翻页效果

最近两天一直在研究如何实现从中间翻页，问了很多人，也在网上查了很多资料，现在终于弄明白了。。。原来如此简单。。。

创建项目

启动Xcode，新建iOS  Empty Application 项目

创建PageAppViewController

新建PageAppViewController项目，继承自UIPageViewController，如图：

PageViewController.h中代码如下：

#import <UIKit/UIKit.h>

@interface PageViewController :UIPageViewController<UIPageViewControllerDataSource,UIPageViewControllerDelegate>

@property(retain,nonatomic)NSArray * pageContent;

@property(retain,nonatomic)NSMutableArray * arr;

@end

PageViewController.m中代码：

#import "PageViewController.h"

@interface PageViewController ()

@end

@implementation PageViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

   self = [superinitWithNibName:nibNameOrNilbundle:nibBundleOrNil];

   if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [superviewDidLoad];

// Do any additional setup after loading the view.

    self.arr = [NSMutableArrayarrayWithCapacity:0];

    [selfcreateContentPages];

    

    

    self.dataSource =self;

   self.delegate =self;

}

- (void)didReceiveMemoryWarning

{

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void)createContentPages{

   for (int i =0; i <10; i ++) {

        UIViewController * viewCtl = [[UIViewControlleralloc]init];

        viewCtl.view.backgroundColor = [UIColorredColor];

        [self.arraddObject:viewCtl];

    }

    [selfsetViewControllers:@[self.arr[0]]direction:(UIPageViewControllerNavigationDirectionForward)animated:NOcompletion:nil];

    self.pageContent = [[NSArrayalloc]initWithArray:self.arr];

}

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{

   NSArray * viewControllers =@[self.arr[0],self.arr[1]];

    [selfsetViewControllers:viewControllersdirection:(UIPageViewControllerNavigationDirectionForward)animated:NOcompletion:nil];

    returnUIPageViewControllerSpineLocationMid;

}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{

   int index = [self.arrindexOfObject:viewController];

   if (index >=0 && index <self.arr.count -1) {

       return [self.arrobjectAtIndex:index + 1];

    }

    return nil;

}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{

   int index = [self.arrindexOfObject:viewController];

   if (index >0 && index <self.arr.count -1) {

       return [self.arrobjectAtIndex:index - 1];

    }

    return nil;

}

@end

然后运行就可以了。