如何使用UIPageViewController加载单独的XIB？ [英] How do I use UIPageViewController to load separate XIBs?

问题描述

我正在深入研究UIPageViewControllers的新世界，并且有很多教程，但是它们似乎都创建了一个视图，然后只使用不同内容的新实例。

I'm delving into the new world of UIPageViewControllers and there are a lot of tutorials out there, however all of them seem to create one view, and then just use new instances of it with different content.

我真的希望能够创建多个XIB，然后将它们与UIPageViewController链接起来，但它太新了，我无法理解它的工作方式。

I'd really like to be able to create multiple XIBs and then just chain them together with the UIPageViewController but it's too new and I can't get my head around the way it works.

推荐答案

嗯，这是一个很长的答案，你应该可以复制和粘贴。 （此代码改编自Erica Sadun（https://github.com/erica/iOS-5-Cookbook））

Well, here's a long answer that you should be able to copy and paste. (This code was adapted from Erica Sadun (https://github.com/erica/iOS-5-Cookbook))

首先，创建一个类型为UIPageViewController的新类。称之为BookController。现在将以下代码粘贴到.h文件中。

First, create a new class of type UIPageViewController. Call it BookController. Now paste the following code in your .h file.

// 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;

和你的.m档案：

#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;
}

此类现在可用于控制您在任何项目中创建的任何书籍，以及单个项目中的多本书籍。对于每本书，使用@interface创建一个委托UIPageViewController：

This Class can now be used to control any book you create in any project, and for multiple books in a single project. For each book, create a delegate UIPageViewController with the @interface:

@interface NameOfBookController : UIPageViewController <BookControllerDelegate>

在此代表的.m文件中，包括：

In the .m file of this delegate, include:

// 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];
}

然后添加：

- (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;
}

对于记录，此代码不是内存安全的。如果使用ARC，请添加@autoreleasePool {};如果没有，请不要忘记你的保留/发布周期。

For the record, this code is not memory-safe. If using ARC, add in your @autoreleasePool{}; if not, don't forget your retain/release cycle.

我希望这有帮助！

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