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将 pageviewcontroller 与页面卷曲转换一起使用，并希望在用户翻页时使用页码更新导航栏。

- (void)viewDidLoad {

[super viewDidLoad];

//modelArray holds the page numbers
modelArray = [[NSMutableArray alloc] init];

for (int index = 1; index <= totalPages; index++) {

[modelArray addObject:[NSString stringWithFormat:@"%i", index]];

}

_navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 45)];

_navBar.tintColor = [UIColor colorWithRed:243.0/255.0 green:164.0/255.0 blue:0.0/255.0 alpha:1.0];

 [self displayPageNumber:1];

thePageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation: UIPageViewControllerNavigationOrientationHorizontal options:nil];

thePageViewController.delegate = self;
thePageViewController.dataSource = self;

thePageViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

contentViewController = [[ContentViewController alloc] initWithPDF:PDFDocument];
contentViewController.page = [modelArray objectAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:contentViewController];
[thePageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

[self addChildViewController:thePageViewController];
[self.view addSubview:thePageViewController.view];
thePageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

[thePageViewController didMoveToParentViewController:self];

_toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 960, self.view.bounds.size.width, 45)];

_toolbar.barStyle = UIBarStyleBlackOpaque;

_toolbar.tintColor = [UIColor colorWithRed:243.0/255.0 green:164.0/255.0 blue:0.0/255.0 alpha:1.0];

 [self.view addSubview:_toolbar];

[self.view addSubview:_navBar];
 }

- (void) displayPageNumber:(NSUInteger)pageNumber {
UINavigationItem *title = [[UINavigationItem alloc] initWithTitle:[NSString stringWithFormat:
                                                                   @"Page %i of %i",
                                                                   pageNumber,
                                                                   CGPDFDocumentGetNumberOfPages(PDFDocument)]];
[_navBar pushNavigationItem:title animated:NO];
}

当用户翻页时，使用此代码用页码更新导航栏

但它没有更新导航栏上的页码

- (void) pageViewController:(PageViewController *)pageViewController willTurnToPageAtIndex:(NSUInteger)pageIndex {
[self displayPageNumber:pageIndex + 1];
 }

感谢帮助。

谢谢

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