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  • iOS UIPageViewController

    UIPageViewController是App中常用的控制器。它提供了一种分页效果来显示其childController的View。用户可以通过手势像翻书一样切换页面。
    切换页面时看起来是连续的,但静止状态下UIPageViewController同时只有一个childViewController。它的导航效果是通过替换childController实现的。
    这是一种非常有效的设计:无论是三两个还上千个页面,用户的翻页与导航处理都是无差别的。因为这些页面都是即时创建的,每个页面只有当你浏览它的时候才会存在。这种设计显然苹果更多地考虑了内存的问题和通用性。
    UIPageViewController替我们解决了页面导航、childController生命周期管理、 平滑过渡动画(index不相邻页面切换时)等问题。
    下面做了简单是学习!

    //
    //  ViewController.m
    //  DemoTest

    #import "ViewController.h"
    #import "PageChildViewController.h"

    @interface ViewController ()<UIPageViewControllerDelegate, UIPageViewControllerDataSource>

    @property (nonatomic, strong) UIPageViewController * pageViewController;

    @end

    @implementation ViewController

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

    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }


    /** UIPageViewController */
    - (void)setUpPageViewController {
        [self addChildViewController:self.pageViewController];
        [self.view addSubview:self.pageViewController.view];
    }

    //翻页效果
    //UIPageViewControllerTransitionStylePageCurl
    //滚动效果
    //UIPageViewControllerTransitionStyleScroll

    //效果方向
    //UIPageViewControllerNavigationOrientationHorizontal
    //UIPageViewControllerNavigationOrientationVertical

    //从左往右(或从下往上)
    //UIPageViewControllerNavigationDirectionForward,
    //从左往右(或从下往上)
    //UIPageViewControllerNavigationDirectionReverse

    //options: 这个参数是可选的,传入的是对UIPageViewController的一些配置组成的字典,不过这个参数只能以UIPageViewControllerOptionSpineLocationKey和UIPageViewControllerOptionInterPageSpacingKey这两个key组成的字典.
    //1) UIPageViewControllerOptionSpineLocationKey 这个key只有在style是翻书效果UIPageViewControllerTransitionStylePageCurl的时候才有作用, 它定义的是书脊的位置,值对应着UIPageViewControllerSpineLocation这个枚举项,不要定义错了哦.
    //2) UIPageViewControllerOptionInterPageSpacingKey这个key只有在style是UIScrollView滚动效果UIPageViewControllerTransitionStyleScroll的时候才有作用, 它定义的是两个页面之间的间距(默认间距是0).
    //UIPageViewControllerOptionInterPageSpacingKey - 两者之间间距
    //UIPageViewControllerOptionSpineLocationKey - 书脊的位置
    //除了初始化方法系统还提供了一个属性
    //
    //@property (nonatomic, getter=isDoubleSided) BOOL doubleSided; // Default is 'NO'.
    //
    //这个属性默认为NO,如果我们当前屏幕仅展示一个页面那么不用设置这个属性,如果设置了UIPageViewControllerSpineLocationMid这个选项,效果是翻开的书这样屏幕展示的就是两个页面,这个属性就必须设置为YES了.
    //
    //此外还有一个重要方法:
    //
    //- (void)setViewControllers:(nullable NSArray<UIViewController *> *)viewControllers
    //                 direction:(UIPageViewControllerNavigationDirection)direction
    //                  animated:(BOOL)animated
    //                completion:(void (^ __nullable)(BOOL finished))completion;
    //
    //这个方法是设置UIPageViewController初始显示的页面,如果doubleSided设为YES了,那么viewControllers这个参数至少包含两个页面.


    - (UIPageViewController *)pageViewController {
        if (!_pageViewController) {
            NSDictionary *options = @{UIPageViewControllerOptionInterPageSpacingKey : @(20)};
    //        NSDictionary *options = @{UIPageViewControllerOptionSpineLocationKey : @(UIPageViewControllerSpineLocationMin)};
            self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:(UIPageViewControllerTransitionStyleScroll) navigationOrientation:(UIPageViewControllerNavigationOrientationHorizontal) options:options];
            _pageViewController.delegate = self;
            _pageViewController.dataSource = self;

    //appearance 预设一个类的设置,不包括tintColor;
    //        UIPageControl *pageControl = [UIPageControl appearance];
    //        pageControl.pageIndicatorTintColor = [UIColor greenColor];
    //        pageControl.currentPageIndicatorTintColor = [UIColor redColor];
    //        pageControl.backgroundColor = [UIColor whiteColor];
            [_pageViewController setViewControllers:@[[self viewControllerAtIndex:0]] direction:(UIPageViewControllerNavigationDirectionForward) animated:YES completion:nil];
            _pageViewController.view.frame = self.view.bounds;
        }
        return _pageViewController;
    }
    #pragma mark - delegate
    /** 开始滚动时 */
    - (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray<UIViewController *> *)pendingViewControllers {
        NSInteger index = [(PageChildViewController *)pendingViewControllers.firstObject pageIndex];
        NSLog(@"-=-=-=-=-=000000000-=-=-==-=-==%ld", index);
    }
    /** 结束滚动时 */
    - (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed {
        NSInteger index = [(PageChildViewController *)previousViewControllers.firstObject pageIndex];
        NSLog(@"-=-=-=-=-=111111111-=-=-==-=-==%ld", index);
    }
    ///** 横竖屏变化 */
    //- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation {
    //    
    //}
    ///** 设置UIPageViewController支持的屏幕旋转类型 */
    //- (UIInterfaceOrientationMask)pageViewControllerSupportedInterfaceOrientations:(UIPageViewController *)pageViewController {
    //    
    //}
    ///** 设置应用程序当前的屏幕的方向 */
    //- (UIInterfaceOrientation)pageViewControllerPreferredInterfaceOrientationForPresentation:(UIPageViewController *)pageViewController {
    //    
    //}
    #pragma mark - dataSource
    /** 返回前一个页面,nil时不滚动 */
    - (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
        NSInteger index = [(PageChildViewController *)viewController pageIndex];
        if (index == 0) {
            return nil;
        }else {
            index--;
            return [self viewControllerAtIndex:index];
        }
    }
    /** 返回后一个页面,nil时不滚动 */
    - (nullable UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
        NSInteger index = [(PageChildViewController *)viewController pageIndex];
        if (index == 3) {
            return nil;
        }else {
            index++;
            return [self viewControllerAtIndex:index];
        }
    }

    ///** Item总数 */
    //- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
    //    return 4;
    //}
    ///** 返回默认展示的页面index */
    //- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController{
    //    return 0;
    //}

    - (UIViewController *)viewControllerAtIndex:(NSInteger)index {
        PageChildViewController *viewController = [[PageChildViewController alloc] init];
        viewController.pageIndex = index;
        viewController.view.backgroundColor = [self LPCColorRandom];
        return viewController;
    }

    - (UIColor *)LPCColorRandom {
        CGFloat hue = ( arc4random() % 256 / 256.0 ); //0.0 to 1.0
        CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0,away from white
        CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; //0.5 to 1.0,away from black
        return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
    }

    @end

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  • 原文地址:https://www.cnblogs.com/yujidewu/p/6116895.html
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