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前言

笔者最近在写项目时想实现一个翻书效果，上网学习到了UIPageViewController今天写本篇博客总结一下关于该控制器的学习，这里笔者学习较浅，后期再进行补充。下面我给出一张图来展现UIPageViewController的使用结构：

创建一个UIPageViewController

最简单的使用

首先新建一个类作为翻页视图控制器中具体的每一页视图控制器，使其继承与UIViewController :
ModelViewController类：

#import <UIKit/UIKit.h>NS_ASSUME_NONNULL_BEGIN@interface ModelViewController : UIViewController
+(ModelViewController *)creatWithIndex:(int)index;
@property(nonatomic,strong)UILabel * indexLabel;@end
NS_ASSUME_NONNULL_END#prama mark - ModelViewController.m#import "ModelViewController.h"
@interface ModelViewController ()
@end
@implementation ModelViewController
+(ModelViewController *)creatWithIndex:(int)index{ModelViewController * con = [[ModelViewController alloc]init];con.indexLabel = [[UILabel alloc]initWithFrame:CGRectMake(110, 200, 100, 30)];con.indexLabel.text = [NSString stringWithFormat:@"第%d页",index];[con.view addSubview:con.indexLabel];return con;
}这个方法调用时就会增加一个页面。
- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor redColor];
}
@end

***ViewControlller类:

#import "PageViewController.h"@interface PageViewController () <UIPageViewControllerDelegate, UIPageViewControllerDataSource>
@property (nonatomic, strong) UIPageViewController* pageViewControl;
@property (nonatomic, strong) NSMutableArray* dataArray;
@end@implementation PageViewController
- (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;}else{return _dataArray[index-1];}
}
//翻页控制器进行向后翻页动作 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 viewControllerAfterViewController:(UIViewController *)viewController{int index = (int)[_dataArray indexOfObject:viewController];if (index==9) {return nil;}else{if (_dataArray.count - 1 >= (index + 1)) {return _dataArray[index + 1];}else{ModelViewController * model = [ModelViewController creatWithIndex:index + 2];[_dataArray addObject:model];return model;}}
}
//屏幕旋转触发的代理方法
- (UIPageViewControllerSpineLocation) pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{return UIPageViewControllerSpineLocationMin;
}
//设置分页控制器的分页数
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {return 10;
}
//设置初始的分页点
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController{return 0;
}
@end

效果图:

• UIPageViewControllerNavigationOrientationHorizontal：指定为水平滑动，还可以使用UIPageViewControllerNavigationOrientationVertical来进行竖直滑动。

UIPageViewController的方法说明：

//设置数据源
@property (nullable, nonatomic, weak) id <UIPageViewControllerDelegate> delegate;
//设置代理
@property (nullable, nonatomic, weak) id <UIPageViewControllerDataSource> dataSource;
//获取翻页风格
@property (nonatomic, readonly) UIPageViewControllerTransitionStyle transitionStyle;
//获取翻页方向
@property (nonatomic, readonly) UIPageViewControllerNavigationOrientation navigationOrientation;
//获取书轴类型
@property (nonatomic, readonly) UIPageViewControllerSpineLocation spineLocation;
//设置是否双面显示
@property (nonatomic, getter=isDoubleSided) BOOL doubleSided;

1. 翻页风格：

typedef NS_ENUM(NSInteger, UIPageViewControllerTransitionStyle) {UIPageViewControllerTransitionStylePageCurl = 0, // 类似于滚动视图翻页效果UIPageViewControllerTransitionStyleScroll = 1 // 类似于书本翻页效果
};

2. 翻页方向

typedef NS_ENUM(NSInteger, UIPageViewControllerNavigationOrientation) {UIPageViewControllerNavigationOrientationHorizontal = 0,//水平翻页UIPageViewControllerNavigationOrientationVertical = 1//竖直翻页
};

3. spineLocation：

typedef NS_ENUM(NSInteger, UIPageViewControllerSpineLocation) {//对于SCrollView类型的滑动效果 没有书轴 会返回下面这个枚举值UIPageViewControllerSpineLocationNone = 0, //以左边或者上边为轴进行翻转 界面同一时间只显示一个ViewUIPageViewControllerSpineLocationMin = 1,  //以中间为轴进行翻转 界面同时可以显示两个ViewUIPageViewControllerSpineLocationMid = 2, //以下边或者右边为轴进行翻转 界面同一时间只显示一个ViewUIPageViewControllerSpineLocationMax = 3   
};

- (void)setViewControllers:(NSArray<UIViewController *> *)viewControllers direction:(UIPageViewControllerNavigationDirection)direction animated:(BOOL)animated completion:(void (^)(BOOL finished))completion;方法详解：
这个方法是用于以编程方式切换当前显示的页面，下面讲解一下他的参数：

• viewControllers:传入的视图控制器，通常只传入一个（当且仅当spineLocation为UIPageViewControllerSpineLocationMid的时候需要传入两个控制器，即书脊效果下）
• direction：控制页面的动画方向，上述参数中已讲解过。
• completion：动画完成后的回调，可以更新UI等内容。

效果展示

通过上述方法的使用，我们可以画一个纸张翻页的效果，下面给出示例代码：
我们仅需要更改ViewController中的内容即可：

- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib._pageViewControl = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationVertical options:@{UIPageViewControllerOptionSpineLocationKey:@2,UIPageViewControllerOptionInterPageSpacingKey:@10}];self.view.backgroundColor = [UIColor greenColor];_pageViewControl.view.bounds=self.view.bounds;_pageViewControl.dataSource=self;_pageViewControl.delegate=self;ModelViewController * model = [ModelViewController creatWithIndex:1];ModelViewController * model2 = [ModelViewController creatWithIndex:2];[_pageViewControl setViewControllers:@[model,model2] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];_pageViewControl.doubleSided = YES;//是否允许双面展示_dataArray = [[NSMutableArray alloc]init];[_dataArray addObject:model];[self.view addSubview:_pageViewControl.view];
}
- (UIPageViewControllerSpineLocation) pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{return UIPageViewControllerSpineLocationMid;//仅在当前状态下，一张可以展示两个控制器
}

效果图：

UIPageViewController的协议方法

//向前翻页展示的ViewController
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController;
//向后翻页展示的ViewController
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController;
//设置分页控制器的分页点数
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController NS_AVAILABLE_IOS(6_0);
//设置当前分页控制器所高亮的点
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController NS_AVAILABLE_IOS(6_0);//翻页视图控制器将要翻页时执行的方法
- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray<UIViewController *> *)pendingViewControllers NS_AVAILABLE_IOS(6_0);
//翻页动画执行完成后回调的方法
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed;
//屏幕防线改变时回到的方法，可以通过返回值重设书轴类型枚举
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation;

总结：
关于UIPageViewController笔者还有很多地方没有弄懂，对于其使用也仅仅局限于使用其实现仿真翻页效果，后期笔者还会补充其中内容。个人认为可以使用其实现无限轮播效果，并且更为简单方便，后期会尝试来实现一下。