我有以下代码来显示杂志类型的应用程序。当应用程序旋转时,它会运行此代码。我确保它仅在旋转到支持的方向时运行。当此函数返回时,应用程序将失败并显示 SIGABRT。没有其他迹象表明原因。
我知道这是这个功能,因为当我删除它时,程序不会失败。
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
//If portrait mode, change to single page view
if(UIInterfaceOrientationIsPortrait(orientation)){
UIViewController *currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:currentViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
self.pageViewController.doubleSided = NO;
return UIPageViewControllerSpineLocationMin;
//If landscape mode, change to double page view
}else{
//Get current view
UIViewController *currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
//Create an array to store, views
NSArray *viewControllers = nil;
NSUInteger currentIndex = self.currentPage;
//Conditional to check if needs page before or after
if(currentIndex == 1 || currentIndex %2 == 1){
UIViewController *nextViewController = [self pageViewController:self.pageViewController viewControllerAfterViewController:currentViewController];
viewControllers = [NSArray arrayWithObjects:currentViewController,nextViewController, nil];
}else{
UIViewController *previousViewController = [self pageViewController:self.pageViewController viewControllerBeforeViewController:currentViewController];
viewControllers = [NSArray arrayWithObjects:previousViewController, currentViewController, nil];
}
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
return UIPageViewControllerSpineLocationMid;
}
//return UIPageViewControllerSpineLocationMid;
}