UIPageViewControllerのモデルに影響を与えるボタンをどのように実装できるのか疑問に思いました。たとえば、UIPageViewControllerモデル配列に単一のオブジェクトをロードし、ボタンをタップすると、新しいView Controllerが追加され、ページなどが自動的にめくります（メモアプリなど）。ユーザーに表示されている現在のオブジェクトを削除する場合も同様です。
これまでのところ、ルートビューコントローラーにいくつかのIBActionを実装してみましたが、今のところうまくいきません。
ViewControllerクラスを実装する方法は次のとおりです。
@implementation ViewController
@synthesize modelArray = _modelArray;
@synthesize pageVC = _pageVC;
#pragma mark - UIPageViewControllerDataSource Methods
// Returns the view controller before the given view controller. (required)
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerBeforeViewController:(UIViewController *)viewController
{
NSUInteger currentIndex = [self.modelArray indexOfObject:[(ContentVC *)viewController labelContents]];
if(currentIndex==0)
return nil;
ContentVC *cVC = [[ContentVC alloc] init];
cVC.labelContents = [self.modelArray objectAtIndex:currentIndex-1];
return cVC;
}
// Returns the view controller after the given view controller. (required)
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger currentIndex = [self.modelArray indexOfObject:[(ContentVC *)viewController labelContents]];
if(currentIndex==self.modelArray.count-1)
return nil;
ContentVC *cVC = [[ContentVC alloc] init];
cVC.labelContents = [self.modelArray objectAtIndex:currentIndex+1];
return cVC;
}
#pragma mark - UIPageViewControllerDelegate Methods
// Returns the spine location for the given orientation.
- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
if(UIInterfaceOrientationIsPortrait(orientation)){
// Set the array with only 1 view controller
UIViewController *currentVC = [self.pageVC.viewControllers objectAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:currentVC];
[self.pageVC setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
// Set the doubleSided property to NO
self.pageVC.doubleSided = NO;
// Return the spine location
return UIPageViewControllerSpineLocationMin;
} else { // if landscape
NSArray *viewControllers = nil;
ContentVC *currentVC = [self.pageVC.viewControllers objectAtIndex:0];
NSUInteger currentIndex = [self.modelArray indexOfObject:[(ContentVC *)viewControllers labelContents]];
if(currentIndex==0 || currentIndex %2 == 0){
UIViewController *nextViewController = [self pageViewController:self.pageVC viewControllerAfterViewController:currentVC];
viewControllers = [NSArray arrayWithObjects:currentVC, nextViewController, nil];
} else {
UIViewController *previousVC = [self pageViewController:self.pageVC viewControllerBeforeViewController:currentVC];
viewControllers = [NSArray arrayWithObjects:previousVC, currentVC, nil];
}
// Set the view controllers as property of the UIPageViewController
[self.pageVC setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
return UIPageViewControllerSpineLocationMid;
}
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Instantiate the model array
self.modelArray = [[NSMutableArray alloc] init];
[self.modelArray addObject:@"Page One"];
NSLog(@"%@", self.modelArray);
// Instantiate the UIPageViewController
self.pageVC = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
// Assign the delegate and datasource as self
self.pageVC.delegate = self;
self.pageVC.dataSource = self;
// Set the initial view controllers
ContentVC *cVC = [[ContentVC alloc] initWithNibName:@"ContentVC" bundle:nil];
cVC.labelContents = [self.modelArray objectAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:cVC];
[self.pageVC setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
// Add the pageViewController as the childViewController
[self addChildViewController:self.pageVC];
// Add the view of pageViewController to the currentView
[self.view addSubview:self.pageVC.view];
// Call didMoveToParentViewController: of the childViewController, the UIPageViewController instance in our case.
[self.pageVC didMoveToParentViewController:self];
// Assign the gestureRecognizers property of the pageViewController to the view's gestureRecognizers property
self.view.gestureRecognizers = self.pageVC.gestureRecognizers;
}
どうもありがとうございます！