我在ipad中顯示的視圖就像一本書,單個視圖顯示兩個視圖。我想添加更多視圖,以便在查看翻轉的第三個和第四個視圖出現並進一步顯示時。我正在使用下面的代碼來這樣做。我將視圖控制器添加到數組它在定位方法在這一行殺死「ContentViewController * currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];」。在頁面控制器中訪問多個視圖控制器
- (void)viewDidLoad
{
[super viewDidLoad];
//Instantiate the model array
self.modelArray = [[NSMutableArray alloc] init];
for (int index = 1; index <= 12 ; index++)
{
[self.modelArray addObject:[NSString stringWithFormat:@"Page %d",index]];
}
//Step 1
//Instantiate the UIPageViewController.
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
//Step 2:
//Assign the delegate and datasource as self.
self.pageViewController.delegate = self;
self.pageViewController.dataSource = self;
//Step 3:
//Set the initial view controllers.
ViewOne *one = [[ViewOne alloc]initWithNibName:@"ViewOne" bundle:nil];
viewTwo *two = [[viewTwo alloc]initWithNibName:@"ViewTwo" bundle:nil];
ContentViewController *contentViewController = [[ContentViewController alloc] initWithNibName:@"ContentViewController" bundle:nil];
contentViewController.labelContents = [self.modelArray objectAtIndex:0];
// NSArray *viewControllers = [NSArray arrayWithObject:contentViewController];
viewControllers = [NSArray arrayWithObjects:contentViewController,one,two,nil];
[self.pageViewController setViewControllers:viewControllers
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
//Step 4:
//ViewController containment steps
//Add the pageViewController as the childViewController
[self addChildViewController:self.pageViewController];
//Add the view of the pageViewController to the current view
[self.view addSubview:self.pageViewController.view];
//Call didMoveToParentViewController: of the childViewController, the UIPageViewController instance in our case.
[self.pageViewController didMoveToParentViewController:self];
//Step 5:
// set the pageViewController's frame as an inset rect.
CGRect pageViewRect = self.view.bounds;
pageViewRect = CGRectInset(pageViewRect, 40.0, 40.0);
self.pageViewController.view.frame = pageViewRect;
//Step 6:
//Assign the gestureRecognizers property of our pageViewController to our view's gestureRecognizers property.
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
}
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
if(UIInterfaceOrientationIsPortrait(orientation))
{
//Set the array with only 1 view controller
UIViewController *currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:currentViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
//Important- Set the doubleSided property to NO.
self.pageViewController.doubleSided = NO;
//Return the spine location
return UIPageViewControllerSpineLocationMin;
}
else
{
// NSArray *viewControllers = nil;
ContentViewController *currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
NSUInteger currentIndex = [self.modelArray indexOfObject:[(ContentViewController *)currentViewController labelContents]];
if(currentIndex == 0 || currentIndex %2 == 0)
{
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];
}
//Now, set the viewControllers property of UIPageViewController
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
return UIPageViewControllerSpineLocationMid;
}
}
我在initWithViewControllers方法初始化它從委託調用後,它進入viewDidLoad,所以當我嘗試通過調用上面定義的方法移動到下一個視圖控制器數組不會初始化。請檢查此鏈接「http://stackoverflow.com/questions/13875151/array-value-not-retrieving-outside-method-initwithviewcontrollers」 –