iOS 5 新增的UIPageViewController 简单示例

代码说起来也不简单,不过也不复杂,类是UITableView 通过datasource与delegate委托获取数据源和操作.

下面直接上代码:

CWPageModel.h

#import <Foundation/Foundation.h>

@class CWPageController;

@interface CWPageModel : NSObject <UIPageViewControllerDataSource>

@property (strong, nonatomic) NSArray *pageContent; 

- (CWPageController *)viewControllerAtIndex:(NSUInteger)index;
- (NSUInteger)indexOfViewController:(CWPageController *)viewController;
@end

CWPageModel.m

#import "CWPageModel.h"
#import "CWPageController.h"

@implementation CWPageModel
@synthesize pageContent;

- (void) createContentPages {
    NSMutableArray *pageStrings = [[NSMutableArray alloc] init];
    for (int i = 1; i < 11; i++)
    {
        NSString *contentString = [[NSString alloc]
                                   initWithFormat:@"This is the page %d of content displayed using UIPageViewController in iOS 5.", i];
        [pageStrings addObject:contentString];
    }
    pageContent = [[NSArray alloc] initWithArray:pageStrings]; 
}

- (id) init {
    if (self = [super init]) {
        [self createContentPages];
    }
    return self;
}

- (void) dealloc {
    [pageContent release];
    [super dealloc];
}


- (CWPageController *)viewControllerAtIndex:(NSUInteger)index {
    // Return the data view controller for the given index.
    if (([self.pageContent count] == 0) || 
        (index >= [self.pageContent count])) {
        return nil;
    }
    // Create a new view controller and pass suitable data.
    CWPageController *dataViewController =
    [[[CWPageController alloc]
     init] autorelease];
    dataViewController.dataObject =
    [self.pageContent objectAtIndex:index];
    return dataViewController;
}

- (NSUInteger)indexOfViewController:(CWPageController *)viewController {
    return [self.pageContent 
            indexOfObject:viewController.dataObject]; 
}


- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    NSUInteger index = [self indexOfViewController:
                        (CWPageController *)viewController];
    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }
    index--;
    return [self viewControllerAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    NSUInteger index = [self indexOfViewController:
                        (CWPageController *)viewController];
    if (index == NSNotFound) {
        return nil;
    }
    index++;
    if (index == [self.pageContent count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
}

@end

CWPageController.h

#import <UIKit/UIKit.h>

#pragma mark -
#pragma mark pageController
@interface CWPageController : UIViewController

@property (strong, nonatomic) id dataObject;

@end

CWPageController.m

#import "CWPageController.h"

@interface CWPageController ()

@end


@implementation CWPageController
@synthesize dataObject;



- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    UILabel *label = [[UILabel alloc] initWithFrame:self.view.bounds];
    label.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight;
    label.text = dataObject;
    label.numberOfLines = 5;
    [self.view addSubview:label];
    [label release];
}

@end

main.m

#import <UIKit/UIKit.h>
#import "CWPageController.h"
#import "CWPageModel.h"

#define BARBUTTONITEM(title,act) [[[UIBarButtonItem alloc] initWithTitle:title \
style:UIBarButtonItemStylePlain \
target:self \
action:act] autorelease];


//--------------------------------------------------------------------------------------------
#pragma mark -
#pragma mark ViewController()

@interface ViewController : UIViewController <UIPageViewControllerDelegate> {

}

@property (nonatomic,retain) UIPageViewController *pageController;
@property (nonatomic,retain) CWPageModel    *pModel;

@end


@implementation ViewController

@synthesize pageController = _pageController;
@synthesize pModel = _pModel;

- (void) dealloc {
    [_pageController release];
    [_pModel release];
    
    [super dealloc];
}


- (void) viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"demo";
    
    _pModel = [[CWPageModel alloc] init];
    
    NSDictionary *options = 
    [NSDictionary dictionaryWithObject:
     [NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin]
                                forKey: UIPageViewControllerOptionSpineLocationKey];
        
    _pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
                                                      navigationOrientation:UIPageViewControllerNavigationOrientationVertical
                                                                    options:options];
    CWPageController *initialViewController =
    [_pModel viewControllerAtIndex:0];
    NSArray *viewControllers =
    [NSArray arrayWithObject:initialViewController];
    [_pageController setDataSource:_pModel];

    [_pageController setViewControllers:viewControllers
                              direction:UIPageViewControllerNavigationDirectionReverse
                               animated:NO
                             completion:^(BOOL f){}];
    [self addChildViewController:_pageController];
    [self.view addSubview:_pageController.view];
    [_pageController didMoveToParentViewController:self];
}

- (void) viewDidUnload {

    [super viewDidUnload];
}
- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    return YES;
}


@end


//-----------------------------------------------------------------------------------------------------

#pragma mark -
#pragma mark AppDelegate
@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UIViewController *viewController;

@end

@implementation AppDelegate

@synthesize window = _window;
@synthesize viewController = _viewController;

- (void) dealloc {
    [_window release];
    [_viewController release];
    
    [super dealloc];
}

- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    srand(time(NULL));
    
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    
    self.viewController = [[[ViewController alloc] init] autorelease];
    
    UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    self.window.rootViewController = controller;
    [controller release];
    
    [self.window makeKeyAndVisible];
    return YES;
}

@end

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}