3分钟学会用UIPageViewController

UIPageViewController

介绍：

属性介绍

typedef NS_ENUM(NSInteger, UIPageViewControllerNavigationOrientation) {
    UIPageViewControllerNavigationOrientationHorizontal = 0,// 水平方向翻页过渡
    UIPageViewControllerNavigationOrientationVertical = 1// 垂直方向翻页过渡
};

typedef NS_ENUM(NSInteger, UIPageViewControllerSpineLocation) {
    UIPageViewControllerSpineLocationNone = 0, // Returned if 'spineLocation' is queried when 'transitionStyle' is not 'UIPageViewControllerTransitionStylePageCurl'.
    UIPageViewControllerSpineLocationMin = 1,  // Requires one view controller.
    UIPageViewControllerSpineLocationMid = 2,  // Requires two view controllers.
    UIPageViewControllerSpineLocationMax = 3   // Requires one view controller.
};   // Only pertains to 'UIPageViewControllerTransitionStylePageCurl'.

typedef NS_ENUM(NSInteger, UIPageViewControllerTransitionStyle) {
    UIPageViewControllerTransitionStylePageCurl = 0, // 纸质翻页效果过渡
    UIPageViewControllerTransitionStyleScroll = 1 // 平滑滚动翻页效果过渡
    };

// 设置pageViewController 首页array顺序
typedef NS_ENUM(NSInteger, UIPageViewControllerNavigationDirection) {
    UIPageViewControllerNavigationDirectionForward,// 正序（左到右、上到下）
    UIPageViewControllerNavigationDirectionReverse//逆序 （右到左、下到上）
}; 

@property (nonatomic, getter=isDoubleSided) BOOL doubleSided;
 // 一次翻页的两页。默认为No，一次为一页，Yes为翻两页
//除了用 UIPageViewControllerSpineLocationMid 时为Yes，其余的时候为No

@property (nullable, nonatomic, readonly) NSArray<__kindof UIViewController *> *viewControllers; // 通过setViewControllers:方法将View

UIPageViewControllerDelegate

- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers NS_AVAILABLE_IOS(6_0) // 将要过渡要目标ViewController时调用

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed;//过渡动画结束，

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation ;
// 根据屏幕旋转方向设置书脊(spine Location)位置和初始化首页、重新设置doubleSided 

UIPageViewControllerDataSource

- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController  viewControllerBeforeViewController:(UIViewController *)viewController;
// 往前翻页

- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController;
// 往后翻页

使用方法

创建两个ViewController：ReaderViewController 和 ReaderPagesViewController

ReaderViewController

1、首先声明两个属性

@property (nonatomic, strong)UIPageViewController *pageViewController;// 页面试图控制器
@property (nonatomic, strong)ReaderPagesViewController *readerPagesViewController; //当前阅读页面 展示控制器

2、Layz Init

- (UIPageViewController *)pageViewController{
    if (!_pageViewController) {
        _pageViewController = [[UIPageViewController alloc]
                               initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
                               navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
                               options:nil];
        _pageViewController.delegate = self;
        _pageViewController.dataSource = self;
        [self.view addSubview:_pageViewController.view];
    }
    return _pageViewController;
}

- (ReaderPagesViewController *)readerPagesViewController{
    if (!_readerPagesViewController) {
        _readerPagesViewController = [[ReaderPagesViewController alloc] init];
        
    }
    return _readerPagesViewController;
}

3、设置pageViewController的 ViewControllerArray和设置 childViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self addChildViewController:self.pageViewController];
    [_pageViewController setViewControllers:@[[[ReaderPagesViewController alloc] init]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil]; 
}

4、实现UIPageViewControllerDelegate 和 UIPageViewControllerDataSource代理方法

#pragma mark - UIPageViewControllerDelegate
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed{
    // 用来获取 当前阅读页面的page&Chapter，目前用不到
}

- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers{
   // 用来处理 当前页面的page&Chapter累加用的 目前用不到
}

#pragma mark - UIPageViewControllerDataSource
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{
  // 前进翻页都 生成一个新控制器
    return [[ReaderPagesViewController alloc] init];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{
     // 后退翻页都 生成一个新控制器
    return [[ReaderPagesViewController alloc] init];
}

ReaderPagesViewController

只需要设置个背景色就好了，方便看效果

- (void)viewDidLoad {
    [super viewDidLoad]; 
    self.view.backgroundColor =[UIColor whiteColor];
}

Reader.gif