【iOS】UIPageViewController学习

UIPageViewController学习

前言
创建一个UIPageViewController
- 最简单的使用
`UIPageViewController`的方法说明：
- 效果展示
`UIPageViewController`的协议方法

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：

objectivec 复制代码

#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:

objectivec 复制代码

#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：

objectivec 复制代码

//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;

翻页风格：

objectivec 复制代码

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
};

翻页方向

objectivec 复制代码

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

spineLocation：

objectivec 复制代码

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View
    UIPageViewControllerSpineLocationMin = 1,  
    //以中间为轴进行翻转 界面同时可以显示两个View
    UIPageViewControllerSpineLocationMid = 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View
    UIPageViewControllerSpineLocationMax = 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：

objectivec 复制代码

- (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

objectivec 复制代码

//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。

【iOS】UIPageViewController学习

UIPageViewController学习

前言

创建一个UIPageViewController

最简单的使用

UIPageViewController的方法说明：

效果展示

UIPageViewController的协议方法

`UIPageViewController`的方法说明：

`UIPageViewController`的协议方法