objective-c - UIPageViewController を使用して個別の XIB をロードするにはどうすればよいですか?

Question

私は UIPageViewControllers の新しい世界を掘り下げており、そこには多くのチュートリアルがありますが、それらはすべて 1 つのビューを作成し、その新しいインスタンスを異なるコンテンツで使用しているようです。

複数の XIB を作成し、それらを UIPageViewController と一緒にチェーンできるようにしたいのですが、それは新しすぎて、その動作方法について理解できません。

score 4 · Accepted Answer

さて、ここにコピーして貼り付けることができるはずの長い答えがあります。(このコードは Erica Sadun (https://github.com/erica/iOS-5-Cookbook) から改作されました)

最初に、タイプ UIPageViewController の新しいクラスを作成します。それを BookController と呼びます。次のコードを .h ファイルに貼り付けます。

// Used for storing the most recent book page used
#define DEFAULTS_BOOKPAGE   @"BookControllerMostRecentPage"

@protocol BookControllerDelegate <NSObject>
- (id) viewControllerForPage: (int) pageNumber;
@optional
- (void) bookControllerDidTurnToPage: (NSNumber *) pageNumber;
@end

@interface BookController : UIPageViewController <UIPageViewControllerDelegate, UIPageViewControllerDataSource>
+ (id) bookWithDelegate: (id) theDelegate;
+ (id) rotatableViewController;
- (void) moveToPage: (uint) requestedPage;
- (int) currentPage;

@property (assign) id <BookControllerDelegate> bookDelegate;
@property (nonatomic, assign) uint pageNumber;

そしてあなたの.mファイルで：

#define IS_IPHONE   ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
#define SAFE_ADD(_Array_, _Object_) {if (_Object_ && [_Array_ isKindOfClass:[NSMutableArray class]]) [pageControllers addObject:_Object_];}
#define SAFE_PERFORM_WITH_ARG(THE_OBJECT, THE_SELECTOR, THE_ARG) (([THE_OBJECT respondsToSelector:THE_SELECTOR]) ? [THE_OBJECT performSelector:THE_SELECTOR withObject:THE_ARG] : nil)


#pragma Utility Class - VC that Rotates
@interface RotatableVC : UIViewController 
@end
@implementation RotatableVC
- (void) loadView 
{
    [super loadView]; 
    self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    self.view.backgroundColor = [UIColor whiteColor];
}
- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation 
{
    return YES;
}
@end


#pragma Book Controller
@implementation BookController
@synthesize bookDelegate, pageNumber;

#pragma mark Debug / Utility
- (int) currentPage
{
    int pageCheck = ((UIViewController *)[self.viewControllers objectAtIndex:0]).view.tag;
    return pageCheck;
}

#pragma mark Page Handling

// Update if you'd rather use some other decision style
- (BOOL) useSideBySide: (UIInterfaceOrientation) orientation
{
    BOOL isLandscape = UIInterfaceOrientationIsLandscape(orientation);
    return isLandscape;
}

// Store the new page and update the delegate
- (void) updatePageTo: (uint) newPageNumber
{   
    pageNumber = newPageNumber;

    [[NSUserDefaults standardUserDefaults] setInteger:pageNumber forKey:DEFAULTS_BOOKPAGE];
    [[NSUserDefaults standardUserDefaults] synchronize];

    SAFE_PERFORM_WITH_ARG(bookDelegate, @selector(bookControllerDidTurnToPage:), [NSNumber numberWithInt:pageNumber]);

}

// Request controller from delegate
- (UIViewController *) controllerAtPage: (int) aPageNumber
{
    if (bookDelegate && 
        [bookDelegate respondsToSelector:@selector(viewControllerForPage:)])
    {
        UIViewController *controller = [bookDelegate viewControllerForPage:aPageNumber];
        controller.view.tag = aPageNumber;
        return controller;
    }
    return nil;
}

// Update interface to the given page
- (void) fetchControllersForPage: (uint) requestedPage orientation: (UIInterfaceOrientation) orientation
{
    BOOL sideBySide = [self useSideBySide:orientation];
    int numberOfPagesNeeded = sideBySide ? 2 : 1;
    int currentCount = self.viewControllers.count;

    uint leftPage = requestedPage;
    if (sideBySide && (leftPage % 2)) leftPage--;

    // Only check against current page when count is appropriate
    if (currentCount && (currentCount == numberOfPagesNeeded))
    {
        if (pageNumber == requestedPage) return;
        if (pageNumber == leftPage) return;
    }

    // Decide the prevailing direction by checking the new page against the old
    UIPageViewControllerNavigationDirection direction = (requestedPage > pageNumber) ? UIPageViewControllerNavigationDirectionForward : UIPageViewControllerNavigationDirectionReverse;
    [self updatePageTo:requestedPage];

    // Update the controllers
    NSMutableArray *pageControllers = [NSMutableArray array];
    SAFE_ADD(pageControllers, [self controllerAtPage:leftPage]);    
    if (sideBySide)
        SAFE_ADD(pageControllers, [self controllerAtPage:leftPage + 1]);

    [self setViewControllers:pageControllers direction: direction animated:YES completion:nil];
}

// Entry point for external move request
- (void) moveToPage: (uint) requestedPage
{
    [self fetchControllersForPage:requestedPage orientation:(UIInterfaceOrientation)[UIDevice currentDevice].orientation];
}

#pragma mark Data Source

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    [self updatePageTo:pageNumber + 1];
    return [self controllerAtPage:(viewController.view.tag + 1)];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    [self updatePageTo:pageNumber - 1];
    return [self controllerAtPage:(viewController.view.tag - 1)];
}

#pragma mark Delegate

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
    NSUInteger indexOfCurrentViewController = 0;
    if (self.viewControllers.count)
        indexOfCurrentViewController = ((UIViewController *)[self.viewControllers objectAtIndex:0]).view.tag;
    [self fetchControllersForPage:indexOfCurrentViewController orientation:orientation];

    BOOL sideBySide = [self useSideBySide:orientation];
    self.doubleSided = sideBySide;

    UIPageViewControllerSpineLocation spineLocation = sideBySide ? UIPageViewControllerSpineLocationMid : UIPageViewControllerSpineLocationMin;
    return spineLocation;
}

-(void)dealloc{
    self.bookDelegate = nil;
}

#pragma mark Class utility routines
// Return a UIViewController that knows how to rotate
+ (id) rotatableViewController
{
    UIViewController *vc = [[RotatableVC alloc] init];
    return vc;
}

// Return a new book
+ (id) bookWithDelegate: (id) theDelegate
{
    BookController *bc = [[BookController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];

    bc.dataSource = bc;
    bc.delegate = bc;
    bc.bookDelegate = theDelegate;

    return bc;
}

このクラスを使用して、任意のプロジェクトで作成した任意のブックを制御したり、1 つのプロジェクト内の複数のブックを制御したりできます。書籍ごとに、@interface を使用してデリゲート UIPageViewController を作成します。

@interface NameOfBookController : UIPageViewController <BookControllerDelegate>

このデリゲートの .m ファイルに、以下を含めます。

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
    [super loadView];
    CGRect appRect = [[UIScreen mainScreen] applicationFrame];
    self.view = [[UIView alloc] initWithFrame: appRect];
    self.view.backgroundColor = [UIColor whiteColor];
    self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;

    // Establish the page view controller
    bookController = [BookController bookWithDelegate:self];
    bookController.view.frame = (CGRect){.size = appRect.size};
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    // Add the child controller, and set it to the first page
    [self.view addSubview:bookController.view];
    [self addChildViewController:bookController];
    [bookController didMoveToParentViewController:self];
}

それから加えて：

- (id) viewControllerForPage: (int) pageNumber
{    

    // Establish a new controller

    UIViewController *controller;


    switch (pageNumber) {
        case 0:
            view1 = [[FirstViewController alloc] init];
            view1.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
            controller = view1;
//rinse and repeat with each new view controller
            break;
        case 1:
            //etc.
            break;
        default:
            return nil;
            break;
    }
    return controller;
}

記録のために、このコードはメモリセーフではありません。ARC を使用している場合は、@autoreleasePool{} を追加してください。そうでない場合は、保持/解放サイクルを忘れないでください。

これが役立つことを願っています！

score 0 · Accepted Answer

この記事では、UIPageViewController を使用して各ページのカスタムビューコントローラーを使用してアプリを作成する方法を示します: http://www.informit.com/articles/article.aspx?p=1760500&seqNum=6

objective-c - UIPageViewController を使用して個別の XIB をロードするにはどうすればよいですか?

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