Question

我们可以在不改变方向的情况下更改脊柱位置。对于某些视图，它设置为max，对于某些视图，它应该是mid。是否可以激活此功能。

这是我正在使用的代码，但不知道在其中修改什么，以便在不改变方向的情况下我可以将脊椎位置设置为最大并设置一个页面模式而不是两个页面模式。实际上，当应用程序运行时，它以两种页面模式启动，但后来它需要移动到单页模式，这是不可能的，它会提供错误，即您提供一个视图但不是两个需要。任何人都可以为此提供指导。

-(id)initWithViewControllers:(NSMutableArray *)Controllers
{
self = [super initWithNibName:nil bundle:nil];
if(self)
{
    self.VControllers =  Controllers;

    pageController = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation: UIPageViewControllerNavigationOrientationHorizontal options:nil];

    self.pageController.view.frame = CGRectMake(12.0f, 10.0f, 748.0f, 985.0f);
    self.pageController.delegate = self;
    self.pageController.dataSource = self;
    [self.pageController setViewControllers:[NSArray arrayWithObject:[VControllers objectAtIndex:0] ] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished)
     {
     }];

    [self addChildViewController:self.pageController];
    [self.view addSubview:self.pageController.view];
    check=YES;
}

return self;
}


 - (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
               spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
 if(UIInterfaceOrientationIsPortrait(orientation))

{

 //Set the array with only 1 view controller
    UIViewController *currentViewController = [self.pageController.viewControllers objectAtIndex:0];
    NSArray *viewControllers = [NSArray arrayWithObject:currentViewController];
    [self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];

    //Important- Set the doubleSided property to NO.
    self.pageController.doubleSided = NO;
    //Return the spine location
    return UIPageViewControllerSpineLocationMax;

 }

else
{
NSArray *viewControllers = nil;

    exampleViewController *currentViewController = [self.pageController.viewControllers objectAtIndex:0];

    NSUInteger currentIndex = [self.VControllers indexOfObject:currentViewController];

    if(currentIndex == 0 || currentIndex %2 == 0)
    {
        UIViewController *nextViewController = [self pageViewController:self.pageController viewControllerAfterViewController:currentViewController];
        viewControllers = [NSArray arrayWithObjects:currentViewController, nextViewController, nil];
    }
    else
    {
        UIViewController *previousViewController = [self pageViewController:self.pageController viewControllerBeforeViewController:currentViewController];
        viewControllers = [NSArray arrayWithObjects:previousViewController, currentViewController, nil];
    }
    //Now, set the viewControllers property of UIPageViewController
    [self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];

    return UIPageViewControllerSpineLocationMid;
}
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
int index = [self.VControllers indexOfObject:viewController];
i=index;
//[self checkViewControllers];
if (index - 1 >= 0)
{
    ind = index;
    return [self.VControllers objectAtIndex:index - 1];
}
return nil;
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
int index = [self.VControllers indexOfObject:viewController];
i=index;

if (index + 1 < [self.VControllers count])
{
    ind = index;
    return [self.VControllers objectAtIndex:index + 1];
}

if (ind1 + 1 < [self.VControllers count])
{
    ind = index;
    return [self.VControllers objectAtIndex:index + 1];
}
return nil;
}

Answer 1

如果您想在UIPageViewController初始化后更改脊柱位置，我认为您可能需要使用新的脊椎位置创建一个新的脊椎位置，并用它替换旧的。

我猜当前的实现只考虑在初始化或更改方向时设置脊柱位置。

您可能会为Apple打开一个错误，以便将来实施该错误。

如何从双模式将页面模式设置为单一模式

1 个答案: