objective-c – 如何使用UIPageViewController加载单独的XIB?

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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.

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.

解决方法

好吧,这是一个很长的答案,你应该能够复制和粘贴. (此代码改编自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.

// 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;

并在您的.m文件中:

#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:

@interface NameOfBookController : UIPageViewController <BookControllerDelegate>

在此委托的.m文件中,包括

// 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;
}

为了记录,此代码不是内存安全的.如果使用ARC,请添加@autoreleasePool {};如果没有,请不要忘记您的保留/释放周期.

我希望这有帮助!

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