如何在iOS 5中向UIPageViewController添加页面数组？

Question

有谁知道我为了将我自己的视图控制器手动添加到UIPageViewController方法而缺少什么？

我目前有这个,我不知道如何继续:

NSDictionary *pageViewOptions = [NSDictionary dictionaryWithObjectsAndKeys:UIPageViewControllerOptionSpineLocationKey, [NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin], nil];

self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:pageViewOptions];


BookViewController *pageOne = [self.storyboard instantiateViewControllerWithIdentifier:@"BookViewController"];

AnotherPage *pageTwo = [self.storyboard instantiateViewControllerWithIdentifier:@"AnotherPage"];

PageThree *pageThree = [self.storyboard instantiateViewControllerWithIdentifier:@"PageThree"];


self.pageViewController.delegate = self;
self.pageViewController.dataSource = self;

[self.pageViewController setViewControllers:[NSArray arrayWithObjects:pageOne, pageTwo, pageThree, nil] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

[self addChildViewController:self.pageViewController];

[self.view addSubview:self.pageViewController.view];

self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;

[self.pageViewController didMoveToParentViewController:self];

但它似乎没有用.我只看到RootViewController.

感谢所有喜欢提前帮助像我这样渴望新手的人.... :)

Answer 1

你设置它的方式并不是很UIPageViewController有效.

首先要理解的是,setViewControllers:direction:animated:completion只设置可见视图控制器,而不是设置您可能希望向用户显示的所有视图控制器.(也就是说,如果我尝试在代码中设置三个控制器的数组,我会得到一个例外.)

其次,如果您有多个可见页面(或两个,具体取决于主干位置),则必须实现UIPageViewControllerDataSource协议以提供页面视图控制器将显示的视图控制器.

这是一个简短的例子(作为子类实现UIPageViewController,但也适用于子页面视图控制器......只需替换self.dataSource = ...为myPageViewController.dataSource = ...)

@implementation MyPageViewController {
    // we keep our page view controllers in an array, but we could just as easily
    // instantiate them on the fly in the data source methods
    NSArray *_pages;
}

- (void)setupPages {
    /*
     * set up three pages, each with a different background color
     */
    UIViewController *a = [[UIViewController alloc] initWithNibName:nil bundle:nil];
    a.view.backgroundColor = [UIColor redColor];
    UIViewController *b = [[UIViewController alloc] initWithNibName:nil bundle:nil];
    b.view.backgroundColor = [UIColor greenColor];
    UIViewController *c = [[UIViewController alloc] initWithNibName:nil bundle:nil];
    c.view.backgroundColor = [UIColor blueColor];
    _pages = @[a, b, c];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupPages];
    self.dataSource = self;
    // set the initially visible page's view controller... if you don't do this
    // you won't see anything.
    [self setViewControllers:@[_pages[0]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished) {
    }];
}

#pragma mark - UIPageViewControllerDataSource

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    if (nil == viewController) {
        return _pages[0];
    }
    NSInteger idx = [_pages indexOfObject:viewController];
    NSParameterAssert(idx != NSNotFound);
    if (idx >= [_pages count] - 1) {
        // we're at the end of the _pages array
        return nil;
    }
    // return the next page's view controller
    return _pages[idx + 1];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    if (nil == viewController) {
        return _pages[0];
    }
    NSInteger idx = [_pages indexOfObject:viewController];
    NSParameterAssert(idx != NSNotFound);
    if (idx <= 0) {
        // we're at the end of the _pages array
        return nil;
    }
    // return the previous page's view controller
    return _pages[idx - 1];
}