實例講解iOS中的UIPageViewController翻頁視圖控制器

更新時間：2016年06月24日 09:25:04 作者：琿少

UIPageViewController更像是一個視圖容器,將每頁不同的ViewController整合,這里我們將以實例講解iOS中的UIPageViewController翻頁視圖控制器:

一、引言

UIPageViewController是iOS中少見的動畫視圖控制器之一，通過它既可以創(chuàng)建類似UIScrollView與UIPageControl結(jié)合的滾屏視圖，也可以創(chuàng)建類似圖書效果的炫酷翻頁視圖。

UIPageViewController在iOS 5 SDK中首次引入，它使得開發(fā)者可以使用這個ViewController創(chuàng)建分頁視圖。在iOS 6中，這個類有了更新，支持滾動過渡效果。使用Page View，用戶可以方便的通過手勢在多個頁面之間導航。UIPageViewController并不僅僅用于引導頁，很多游戲，例如：憤怒的小鳥，就是用Page View來展示關卡選擇的頁面，還有有關書籍的應用，用這個類來顯示書的頁面。
UIPageViewController是個高度可配置的類，你可以進行如下配置：

分頁的方向——水平或垂直
翻頁的樣式——書卷翻頁或者滑動翻頁
書脊位置——只有書卷翻頁樣式有效
頁面間距——只有滑動翻頁樣式有效，用來定義頁面間距（inter-page spacing）

UIPageViewController類似一個視圖容器，其中每個具體的視圖由各自的ViewController進行維護管理，UIPageViewController只進行協(xié)調(diào)與動畫布置。下圖可以很好的展現(xiàn)出UIPageViewControlelr的使用結(jié)構(gòu)：

201662491745638.png (1013×539)

上圖中，UIPageViewControllerDataSource協(xié)議為UIPageViewController提供數(shù)據(jù)支持，DataSource協(xié)議提供的數(shù)據(jù)來自各個ViewContoller自行維護，UIPageViewControllerDelegate中的回調(diào)可以對翻頁動作，屏幕旋轉(zhuǎn)動作等進行監(jiān)聽。UIPageViewController把從DataSource中獲取到的視圖數(shù)據(jù)渲染給View用于當前視圖控制器的展示。

為了演示，我們會一起創(chuàng)建一個簡單的app。當然，我們不會演示所有的UIPageViewController的配置細節(jié)，我們會演示到使用滑動翻頁樣式來創(chuàng)建一個引導頁。不過別擔心，有了對UIPageViewController的基本理解，我相信你能夠去探索其他的特性。

開始吧！

二、創(chuàng)建一個UIPageViewController

首先新建一個類作為翻頁視圖控制器中具體每一頁視圖的控制器，使其繼承于UIViewController：

ModelViewController.h

#import <UIKit/UIKit.h> @interface ModelViewController : UIViewController +(ModelViewController *)creatWithIndex:(int)index; @property(nonatomic,strong)UILabel * indexLabel; @endModelViewController.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文件中實現(xiàn)如下代碼：

#import "ViewController.h" #import "ModelViewController.h" //遵守協(xié)議 @interface ViewController ()<UIPageViewControllerDataSource,UIPageViewControllerDelegate> { //翻頁視圖控制器對象 UIPageViewController * _pageViewControl; //數(shù)據(jù)源數(shù)組 NSMutableArray * _dataArray; } @end

@implementation ViewController

- (void)viewDidLoad { [super viewDidLoad]; //進行初始化 _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(shù)據(jù)源與代理 _pageViewControl.dataSource=self; _pageViewControl.delegate=self; //創(chuàng)建初始界面 ModelViewController * model = [ModelViewController creatWithIndex:1]; //設置初始界面 [_pageViewControl setViewControllers:@[model] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil]; //設置是否雙面展示 _pageViewControl.doubleSided = NO; _dataArray = [[NSMutableArray alloc]init]; [_dataArray addObject:model]; [self.view addSubview:_pageViewControl.view]; } //翻頁控制器進行向前翻頁動作這個數(shù)據(jù)源方法返回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]; } } //翻頁控制器進行向后翻頁動作這個數(shù)據(jù)源方法返回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(zhuǎn)觸發(fā)的代理方法 - (UIPageViewControllerSpineLocation) pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation{ return UIPageViewControllerSpineLocationMin; } //設置分頁控制器的分頁數(shù) - (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController { return 10; } //設置初始的分頁點 - (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController{ return 0; } @end上面創(chuàng)建了最簡單的翻頁視圖控制器示例，效果如下圖：

201662491842840.png (240×426)

三、UIPageViewController中方法使用解析

//創(chuàng)建翻頁視圖控制器對象 - (instancetype)initWithTransitionStyle:(UIPageViewControllerTransitionStyle)style navigationOrientation:(UIPageViewControllerNavigationOrientation)navigationOrientation options:(nullable NSDictionary<NSString *, id> *)options;上面方法用于創(chuàng)建視圖控制器對象，其中UIPageViewControllerTransitionStyle參數(shù)設置翻頁控制器的風格，枚舉如下：

typedef NS_ENUM(NSInteger, UIPageViewControllerTransitionStyle) { UIPageViewControllerTransitionStylePageCurl = 0, //類似于書本翻頁效果 UIPageViewControllerTransitionStyleScroll = 1 // 類似于ScrollView的滑動效果 };如果設置為UIPageViewControllerTransitionStyleCurl，翻頁效果如下圖所示：

201662491859309.png (240×426)

上面初始化方法中的UIPageViewControllerNavigationOrientation屬性設置翻頁的方向，枚舉如下：

typedef NS_ENUM(NSInteger, UIPageViewControllerNavigationOrientation) { UIPageViewControllerNavigationOrientationHorizontal = 0,//水平翻頁 UIPageViewControllerNavigationOrientationVertical = 1//豎直翻頁 };options參數(shù)用于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：

//這個鍵需要設置為UIPageViewControllerOptionSpineLocationKey枚舉值對應的NSNumber對象設置翻頁控制器的書軸后面會介紹 NSString * const UIPageViewControllerOptionSpineLocationKey; //這個鍵需要設置為NSNumber類型設置每頁視圖的間距用于滾動視圖風格的 NSString * const UIPageViewControllerOptionInterPageSpacingKey;下面是UIPageViewController的一些常用屬性與方法：

//設置數(shù)據(jù)源 @property (nullable, nonatomic, weak) id <UIPageViewControllerDelegate> delegate; //設置代理 @property (nullable, nonatomic, weak) id <UIPageViewControllerDataSource> dataSource; //獲取翻頁風格 @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; //設置是否雙面顯示 @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;上面只有spineLocation屬性有些難于理解，其枚舉如下：

typedef NS_ENUM(NSInteger, UIPageViewControllerSpineLocation) { //對于SCrollView類型的滑動效果沒有書軸會返回下面這個枚舉值 UIPageViewControllerSpineLocationNone = 0, //以左邊或者上邊為軸進行翻轉(zhuǎn) 界面同一時間只顯示一個View UIPageViewControllerSpineLocationMin = 1, //以中間為軸進行翻轉(zhuǎn) 界面同時可以顯示兩個View UIPageViewControllerSpineLocationMid = 2, //以下邊或者右邊為軸進行翻轉(zhuǎn) 界面同一時間只顯示一個View UIPageViewControllerSpineLocationMax = 3 };將上面的示例代碼修改幾個地方如下：

- (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; }運行效果如下圖所示：

201662491917434.png (240×426)

四、UIPageViewControllerDataSource中方法解析

//向前翻頁展示的ViewController - (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController; //向后翻頁展示的ViewController - (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController; //設置分頁控制器的分頁點數(shù) - (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController NS_AVAILABLE_IOS(6_0); //設置當前分頁控制器所高亮的點 - (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController NS_AVAILABLE_IOS(6_0);五、UIPageViewControllerDelegate中方法解析

//翻頁視圖控制器將要翻頁時執(zhí)行的方法 - (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray<UIViewController *> *)pendingViewControllers NS_AVAILABLE_IOS(6_0); //翻頁動畫執(zhí)行完成后回調(diào)的方法 - (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed; //屏幕防線改變時回到的方法，可以通過返回值重設書軸類型枚舉 - (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation;

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