Question

如何滚动到UIPageViewController上的某个页面？

我有一个完美的UIPageViewController但是我有一个UICollectionView，它包含UIPageviewController的所有页面。我想要做的是当用户点击某个页面时，我导航回我的UIPageViewController并显示被点击的页面。

我就这样做了：

获取tapped page = page number
执行segue并将页码发送到UIPageViewController，
进入我的reloadPageviewController方法，它抓取viewControllers数组中的视图控制器并使用setViewControllers:@[vc] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil设置视图控制器，然后添加子控制器（实际内容视图）控制器）并添加子视图。

我记录了视图控制器的索引，它记录了所需的索引（被点击的页面）但在屏幕上显示的是第一页。

这是我的代码：

从CollectionView查询到UIPageViewController

if ([segue.identifier isEqualToString:@"specificLocation"]) {
    //index here is good
    NSLog(@"index for vc clicked:%d", chosenIndexPath.item);
    [segue.destinationViewController performSelectorOnMainThread:@selector(prepareData:) withObject:[NSNumber numberWithInteger:chosenIndexPath.item] waitUntilDone:YES];
}

UIPageViewController

-(void)prepareData:(NSNumber *) index{

   NSInteger index2 = [index integerValue];
  //Correct index received here
   NSLog(@"Receieved index:%d", index2);
   [self reloadPageViewControllerWithIndex:index2];
}

 -(void)reloadPageViewControllerWithIndex:(NSInteger)index{


    //SET UP THE first PAGE
    j=0;
    self.viewcontrollers = [[NSMutableArray alloc]init];
    for (int i=0;i<20;i++) {

       ViewController *vc = [self.storyboard   instantiateViewControllerWithIdentifier:@"ViewController"];
       vc.index = i;

       vc.title =[NSString stringWithFormat:@"Page :%d", i];

       [self.viewcontrollers addObject:vc];
    }


    self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
    self.pageViewController.delegate = self;
    self.pageViewController.dataSource = self;

    NSLog(@"Index for requested vc:%d and total number of vcs:%d",index,    [self.viewcontrollers count]);
    ViewController *vc2 = [self viewControllerForIndex:index];
    NSArray *viewControllers = @[vc2];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];

}

所以我的问题是即使我有想要显示的视图控制器的正确索引，我的UIPageViewController总是会在self.viewcontrollers数组中显示第一个视图控制器

UIPageViewController：自动滚动到某个页面

0 个答案: