UIPageViewController(ScrollStyle)不调用dataSource方法

Question

我想我不清楚Gestures如何使用UIPageViewController.我正在尝试设置一个具有四个不同"屏幕"的应用程序,并决定UIPageviewController将是一个很好的方式来促进它们之间的滑动.这是我执行设置的方法

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self setWorldWalkViewController:[EGLWorldWalkViewController new]]; //One of the content views

[self setPageView:[[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll 
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil]];

[self.pageView setViewControllers:@[self.worldWalkViewController,]//Sets the initial view to display, I think.
direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];

[self.pageView setDelegate:self];
[self.pageView setDataSource:self];

self.window = [[UIWindow alloc]init];
[self.window setRootViewController:self.pageView];

currentView = WorldWalk; //Where WorldWalk is an enum value
[self.window makeKeyAndVisible];

return YES;
}

嗯......我希望不会太久.无论如何这里是dataSource方法:

-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController 
viewControllerAfterViewController:(UIViewController *)viewController{
currentView += 1;
switch (currentView) {
    case WorldWalk:
        return [[EGLWorldWalkViewController alloc]init];
        break;
    case MonthlyMarch:
    //There is more but this method isn't even being called so…

我知道有一些辅助的东西我在这里做错了(就像把所有的东西放在didFinishLaunching :)但是现在我真的专注于弄清楚如何让导航工作.(概念验证阶段.)

值得注意的两件事:

1. 该应用程序专为景观设计(此时)
2. 我没有使用Storyboard,但每个自定义视图控制器都有自己的XIB

该文档似乎表明pageViewController具有映射出的导航内容,并且它只需要数据,但是当我单击并拖动时没有任何反应.我的dataSource方法甚至没有被调用,文档很薄,我觉得我错过了什么,所以也许有人可以启发我？

Answer 1

这个问题发生在我身上,因为我没有保留页面视图控制器.确保你对它有强烈的引用,并且应该调用这些方法.