UIPageViewController和景观

Question

我一直在尝试以下，并没有什么工作

NSDictionary *pageViewOptions = [NSDictionary dictionaryWithObjectsAndKeys:UIPageViewControllerOptionSpineLocationKey, [NSNumber numberWithInteger:UIPageViewControllerSpineLocationMid],nil]; 
NSLog(@"pageViewOptions :%@",pageViewOptions);  

self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:pageViewOptions];  
NSLog(@"spineLocation :%d",self.pageViewController.spineLocation); 

的NSLog的在pageViewOptions是2，在NSLog的是spineLocation 1.这是推动我逼疯了，我想要做的是在脊柱中间初始化。它总是在左边初始化。该应用程序被初始化景观，但只有旋转设备180度的方法 后“ - （UIPageViewControllerSpineLocation）pageViewController：（UIPageViewController *）pageViewController spineLocationForInterfaceOrientation：（UIInterfaceOrientation）方向” 作品，然后我得到的中间脊椎。有人可以请说明这一点。我到处寻找答案。

所有我希望它做的是在景观初始化与脊椎中间

Answer 1

尝试使用“选项”参数：

NSDictionary *options = (UIInterfaceOrientationIsLandscape(self.interfaceOrientation)) ? [NSDictionary dictionaryWithObject: [NSNumber numberWithInteger:UIPageViewControllerSpineLocationMid] forKey: UIPageViewControllerOptionSpineLocationKey] : nil; 

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

... 

而且不要忘了初始化2个内容视图控制器：

NSArray *viewControllers = [NSArray arrayWithObjects:contentViewController1, contentViewController2, nil]; 

[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];