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一、引言

UIPageViewController是IOS中少見的動畫視圖控制器之一，經過它既可以創立相似UIScrollView與UIPageControl結合的滾屏視圖，也可以創立相似圖書效果的炫酷翻頁視圖。

UIPageViewController在IOS 5 SDK中初次引入，它使得開發者可以運用這個ViewController創立分頁視圖。在IOS 6中，這個類有了更新，支持滾動過渡效果。運用Page View，用戶可以方便的經過手勢在多個頁面之間導航。UIPageViewController並不只僅用於引導頁，很多游戲，例如：憤恨的小鳥，就是用Page View來展現關卡選擇的頁面，還有有關書籍的使用，用這個類來顯示書的頁面。
UIPageViewController是個高度可配置的類，你可以停止如下配置：

分頁的方向——程度或垂直 翻頁的款式——書卷翻頁或許滑動翻頁 書脊地位——只要書卷翻頁款式無效 頁面間距——只要滑動翻頁款式無效，用來定義頁面間距（inter-page spacing）

UIPageViewController相似一個視圖容器，其中每個詳細的視圖由各自的ViewController停止維護管理，UIPageViewController只停止協調與動畫布置。下圖可以很好的展示出UIPageViewControlelr的運用構造：

上圖中，UIPageViewControllerDataSource協議為UIPageViewController提供數據支持，DataSource協議提供的數據來自各個ViewContoller自行維護，UIPageViewControllerDelegate中的回調可以對翻頁舉措，屏幕旋轉舉措等停止監聽。UIPageViewController把從DataSource中獲取到的視圖數據渲染給View用於以後視圖控制器的展現。

為了演示，我們會一同創立一個復雜的app。當然，我們不會演示一切的UIPageViewController的配置細節，我們會演示到運用滑動翻頁款式來創立一個引導頁。不過別擔憂，有了對UIPageViewController的根本了解，我置信你可以去探究其他的特性。

開端吧！

二、創立一個UIPageViewController

首先新建一個類作為翻頁視圖控制器中詳細每一頁視圖的控制器，使其承繼於UIViewController：

ModelViewController.h

#import <UIKit/UIKit.h>
@interface ModelViewController : UIViewController
+(ModelViewController *)creatWithIndex:(int)index;
@property(nonatomic,strong)UILabel * indexLabel;
@end
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頁",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
在工程模板自帶的ViewController.m文件中完成如下代碼：

#import "ViewController.h"
#import "ModelViewController.h"
//恪守協議
@interface ViewController ()<UIPageViewControllerDataSource,UIPageViewControllerDelegate>
{
//翻頁視圖控制器對象
UIPageViewController * _pageViewControl;
//數據源數組
NSMutableArray * _dataArray;
}
@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//停止初始化
_pageViewControl = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:@{UIPageViewControllerOptionSpineLocationKey:@0,UIPageViewControllerOptionInterPageSpacingKey:@10}];
self.view.backgroundColor = [UIColor greenColor];
//設置翻頁視圖的尺寸
_pageViewControl.view.bounds=self.view.bounds;
//設置數據源與代理
_pageViewControl.dataSource=self;
_pageViewControl.delegate=self;
//創立初始界面
ModelViewController * model = [ModelViewController creatWithIndex:1];
//設置初始界面
[_pageViewControl setViewControllers:@[model] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
//設置能否雙面展現
_pageViewControl.doubleSided = NO;
_dataArray = [[NSMutableArray alloc]init];
[_dataArray addObject:model];
[self.view addSubview:_pageViewControl.view];
}
//翻頁控制器停止向前翻頁舉措 這個數據源辦法前往的視圖控制器為要顯示視圖的視圖控制器
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{
int index = (int)[_dataArray indexOfObject:viewController];
if (index==0) {
return nil;
}else{
return _dataArray[index-1];
}
}
//翻頁控制器停止向後翻頁舉措 這個數據源辦法前往的視圖控制器為要顯示視圖的視圖控制器
- (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;
}
}
}
//屏幕旋轉觸發的代理辦法
- (UIPageViewControllerSpineLocation) pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{
return UIPageViewControllerSpineLocationMin;
}
//設置分頁控制器的分頁數
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {

return 10;
}
//設置初始的分頁點
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController{
return 0;
}
@end
下面創立了最復雜的翻頁視圖控制器示例，效果如下圖：

三、UIPageViewController中辦法運用解析

//創立翻頁視圖控制器對象
- (instancetype)initWithTransitionStyle:(UIPageViewControllerTransitionStyle)style navigationOrientation:(UIPageViewControllerNavigationOrientation)navigationOrientation options:(nullable NSDictionary<NSString *, id> *)options;
下面辦法用於創立視圖控制器對象，其中UIPageViewControllerTransitionStyle參數設置翻頁控制器的作風，枚舉如下：

typedef NS_ENUM(NSInteger, UIPageViewControllerTransitionStyle) {
UIPageViewControllerTransitionStylePageCurl = 0, //相似於書本翻頁效果
UIPageViewControllerTransitionStyleScroll = 1 // 相似於ScrollView的滑動效果
};
假如設置為UIPageViewControllerTransitionStyleCurl，翻頁效果如下圖所示：

下面初始化辦法中的UIPageViewControllerNavigationOrientation屬性設置翻頁的方向，枚舉如下：

typedef NS_ENUM(NSInteger, UIPageViewControllerNavigationOrientation) {
UIPageViewControllerNavigationOrientationHorizontal = 0,//程度翻頁
UIPageViewControllerNavigationOrientationVertical = 1//豎直翻頁
};
options參數用於設置翻頁視圖控制器的配置字典，其可以設置的配置鍵值如下：

//這個鍵需求設置為UIPageViewControllerOptionSpineLocationKey枚舉值對應的NSNumber對象 設置翻頁控制器的書軸 前面會引見
NSString * const UIPageViewControllerOptionSpineLocationKey;
//這個鍵需求設置為NSNumber類型 設置每頁視圖的間距 用於滾動視圖作風的
NSString * const UIPageViewControllerOptionInterPageSpacingKey;
上面是UIPageViewController的一些常用屬性與辦法：

//設置數據源
@property (nullable, nonatomic, weak) id <UIPageViewControllerDelegate> delegate;
//設置代理
@property (nullable, nonatomic, weak) id <UIPageViewControllerDataSource> dataSource;
//獲取翻頁作風
@property (nonatomic, readonly) UIPageViewControllerTransitionStyle transitionStyle;
//獲取翻頁方向
@property (nonatomic, readonly) UIPageViewControllerNavigationOrientation navigationOrientation;
//獲取書軸類型
@property (nonatomic, readonly) UIPageViewControllerSpineLocation spineLocation;
//設置能否雙面顯示
@property (nonatomic, getter=isDoubleSided) BOOL doubleSided;
//設置要顯示的視圖控制器
- (void)setViewControllers:(nullable NSArray<UIViewController *> *)viewControllers direction:(UIPageViewControllerNavigationDirection)direction animated:(BOOL)animated completion:(void (^ __nullable)(BOOL finished))completion;
下面只要spineLocation屬性有些難於了解，其枚舉如下：

typedef NS_ENUM(NSInteger, UIPageViewControllerSpineLocation) {
//關於SCrollView類型的滑動效果 沒有書軸 會前往上面這個枚舉值
UIPageViewControllerSpineLocationNone = 0,
//以右邊或許上邊為軸停止翻轉 界面同一時間只顯示一個View
UIPageViewControllerSpineLocationMin = 1,
//以兩頭為軸停止翻轉 界面同時可以顯示兩個View
UIPageViewControllerSpineLocationMid = 2,
//以下邊或許左邊為軸停止翻轉 界面同一時間只顯示一個View
UIPageViewControllerSpineLocationMax = 3
};
將下面的示例代碼修正幾個中央如下：

- (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;
_dataArray = [[NSMutableArray alloc]init];
[_dataArray addObject:model];
[self.view addSubview:_pageViewControl.view];
}
- (UIPageViewControllerSpineLocation) pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{
return UIPageViewControllerSpineLocationMid;
}
運轉效果如下圖所示：

四、UIPageViewControllerDataSource中辦法解析

//向前翻頁展現的ViewController
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController;
//向後翻頁展現的ViewController
- (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController;
//設置分頁控制器的分頁點數
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController NS_AVAILABLE_IOS(6_0);
//設置以後分頁控制器所高亮的點
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController NS_AVAILABLE_IOS(6_0);
五、UIPageViewControllerDelegate中辦法解析

//翻頁視圖控制器將要翻頁時執行的辦法
- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray<UIViewController *> *)pendingViewControllers NS_AVAILABLE_IOS(6_0);
//翻頁動畫執行完成後回調的辦法
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed;
//屏幕防線改動時回到的辦法，可以經過前往值重設書軸類型枚舉
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation;


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