Question

我使用UIPageViewControl实现了一个不错的PageControl。当滑动指示器改变并显示正确的当前页面时。

但是我注意到当前页面指示器切换所需的全部是开始滑动。这意味着如果我开始滑动但是然后松开手指，当前页面指示器已经切换，就像页面已经切换一样，但它没有。这是我用来进行切换的代码：

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{

    NSUInteger index = [self.navigationController.viewControllers indexOfObject:viewController];
    self.pageControl.currentPage = index;
}

我注意到的另一件事是，当我向右和向左滑动更改视图时，页面指示器只是卡住而不会移动。

所以它只适用于你不快速更改视图的情况。如果您需要任何其他代码，请告诉我们。谢谢。

修改

这是我用来实现我的UIPageViewController的代码。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Create the data model

    self.navigationItem.title = @"Tabell";
    self.identifiers = [[NSMutableArray alloc] init];

    [self.identifiers addObject:@"rankTable"];
    [self.identifiers addObject:@"page2"];

    // Create page view controller
    self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
    self.pageViewController.dataSource = self;
    self.pageViewController.delegate = self;


    self.navigationController.delegate = self;
    CGSize navBarSize = self.navigationController.navigationBar.bounds.size;
    CGPoint origin = CGPointMake( navBarSize.width/2, navBarSize.height/2 );
    self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(origin.x, origin.y+16,
                                                                       0, 0)]; //Here added 45 to Y and it did the trick


    self.pageControl.pageIndicatorTintColor = navbarColor;
    self.pageControl.currentPageIndicatorTintColor = [UIColor lightGrayColor];

    [self.pageControl setNumberOfPages:2];

    [self.navigationController.navigationBar addSubview:self.pageControl];

    UITableViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

     CGFloat tabBarHeight = self.tabBarController.tabBar.frame.size.height;

    // Change the size of page view controller
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - tabBarHeight);

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

}

Answer 1

为什么不实施UIPageViewControllerDelegate的

- pageViewController: didFinishAnimating: previousViewControllers: transitionCompleted:方法？它有一个transitionCompleted布尔值，告诉您是否应更新页面控件。您当前的实现似乎有问题，因为只要您点击一个页面，它就会为下一页加载一个视图控制器并调用...didShow...方法。希望这可以解决。

UIPageControl当前页面指示符在显示新视图之前切换

1 个答案: