UIPageViewController和景觀

Question

我一直在嘗試以下，並沒有什麼工作

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.這是推動我逼瘋了，我想要做的是在脊柱中間初始化。它總是在左邊初始化。該應用程序被初始化景觀，但只有旋轉設備180度的方法 後「 - （UIPageViewControllerSpineLocation）pageViewController：（UIPageViewController *）pageViewController spineLocationForInterfaceOrientation：（UIInterfaceOrientation）方向」 作品，然後我得到的中間脊椎。有人可以請說明這一點。我到處尋找答案。

所有我希望它做的是在景觀初始化與脊椎中間

Answer 1

嘗試使用「選項」參數：

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個內容視圖控制器：

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

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