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在 AViewController 中有 initwithPDFAtPath

-(id)initWithPDFAtPath:(NSString *)path {

NSURL *pdfUrl = [NSURL fileURLWithPath:path];
thePDF = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfUrl);
totalPages = (int)CGPDFDocumentGetNumberOfPages(thePDF);

self = [super initWithNibName:nil bundle:nil];
return self;

 }

尝试使用 viewDidLoad 方法在 BViewController 中打开 pdf 文件

 - (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]];

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

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

thePageViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
NSString *path = [[NSBundle mainBundle] pathForResource:@"pages" ofType:@"pdf"];

NSURL *pdfurl = [NSURL fileURLWithPath:path];
PDFDocument = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfurl);
AViewController = [[AViewController alloc] initWithPDFAtPath:path];
aViewController.page = [modelArray objectAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:aViewController];

}

当我执行它时，它会因空数组消息而崩溃。由于未捕获的异常“NSRangeException”而终止应用程序，原因：“ * -[__NSArrayM objectAtIndex:]：索引 0 超出空数组的范围”

编辑：

AViewController 有一个 PDFScrollview

   - (void)viewDidLoad
  {
[super viewDidLoad];

// Create our PDFScrollView and add it to the view controller.
CGPDFPageRef PDFPage = CGPDFDocumentGetPage(thePDF, [_page intValue]);

pdfScrollView = [[PDFScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 925)];
[pdfScrollView setPDFPage:PDFPage];

[self.view addSubview:pdfScrollView];
  }
4

2 回答 2

2

从我在这里看到的，看起来你modelArray在你有一个数字之前进行了初始化totalPages，因为这只是设置在initWithPDFAtPath. 尽管我认为您可以（并且应该）重新组织代码，以便只有一个视图控制器必须管理页码，但您可以通过移动该行来解决问题

AViewController *aViewController = [[AViewController alloc] initWithPDFAtPath:path];

到您初始化的点之前modelArray。

希望这可以帮助！

于 2013-07-16T18:34:45.030 回答
1

在我看来，totalPages无法在BViewController.

也不确定你是如何存储它的，因为AViewController你在调用之前初始化这个变量super init可能会导致这个值丢失。

要解决这个问题，我认为你需要做几件事。

首先AViewContoller将 init 方法更改为以下内容：

-(id)initWithPDFAtPath:(NSString *)path {

    self = [super initWithNibName:nil bundle:nil];
    if (self) {
        NSURL *pdfUrl = [NSURL fileURLWithPath:path];
        _thePDF = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfUrl);
        _totalPages = (int)CGPDFDocumentGetNumberOfPages(thePDF);
    }

    return self;
 }

并将 totalPages 存储在参数中。

比BViewController你需要做的

- (void)viewDidLoad {

   [super viewDidLoad];

//modelArray holds the page numbers

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

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

thePageViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
NSString *path = [[NSBundle mainBundle] pathForResource:@"pages" ofType:@"pdf"];

NSURL *pdfurl = [NSURL fileURLWithPath:path];
PDFDocument = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfurl);
AViewController = [[AViewController alloc] initWithPDFAtPath:path];

modelArray = [[NSMutableArray alloc] init];

if (aViewController.totalPages > 0) {
   for (int index = 1; index <= aViewController.totalPages; index++) {

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

       }

       aViewController.page = [modelArray objectAtIndex:0];
   }

        NSArray *viewControllers = [NSArray arrayWithObject:aViewController];
    }

但实际上，所有控制器架构似乎都存在一些明显的问题。

于 2013-07-16T19:39:38.517 回答