实例讲解iOS中的UIPageViewController翻页视图控制器

    con.indexLabel.text = [NSString stringWithFormat:@"第%d页",index];
    [con.view addSubview:con.indexLabel];
    return con;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor redColor];
}
@end
在工程模板自带的ViewController.m文件中实现如下代码：

#import "ViewController.h"
#import "ModelViewController.h"
//遵守协议
@interface ViewController ()<UIPageViewControllerDataSource,UIPageViewControllerDelegate>
{
    //翻页视图控制器对象
    UIPageViewController * _pageViewControl;
    //数据源数组
    NSMutableArray * _dataArray;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //进行初始化
    _pageViewControl = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:@{UIPageViewControllerOptionSpineLocationKey:@0,UIPageViewControllerOptionInterPageSpacingKey:@10}];
    self.view.backgroundColor = [UIColor greenColor];
    //设置翻页视图的尺寸
    _pageViewControl.view.bounds=self.view.bounds;
    //设置数据源与代理
    _pageViewControl.dataSource=self;
    _pageViewControl.delegate=self;
    //创建初始界面
    ModelViewController * model = [ModelViewController creatWithIndex:1];
    //设置初始界面
    [_pageViewControl setViewControllers:@[model] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
    //设置是否双面展示
    _pageViewControl.doubleSided = NO;
    _dataArray = [[NSMutableArray alloc]init];
    [_dataArray addObject:model];
    [self.view addSubview:_pageViewControl.view];
}
//翻页控制器进行向前翻页动作 这个数据源方法返回的视图控制器为要显示视图的视图控制器
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{
    int index = (int)[_dataArray indexOfObject:viewController];
    if (index==0) {
        return nil;