在UIWebview ios中显示特定的pdf页面

Question

我目前正在开发一个项目,我有ios需要显示一个pdf文件.但是我想选择要显示的页面.例如,请参阅UIWebView中的第10页,共37页.我还没有找到一种方法来干净地分离pfd的页面.

谢谢您的帮助.

Answer 1

使用UIWebView's delegate方法执行此操作:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
   //Check if file still loading
   if(!webView.isLoading)
   { 
     //now traverse to specific page
     [self performSelector:@selector(traverseInWebViewWithPage) withObject:nil afterDelay:0.1];
   }
}

现在添加以下方法来遍历您的页面.注意需要有效的PDF文件路径,并提供您想要在PDF文件中遍历的有效特定页面.

-(void)traverseInWebViewWithPage
{
   //Get total pages in PDF File ----------- PDF File name here ---------------
   NSString *strPDFFilePath = [[NSBundle mainBundle] pathForResource:@"yourPDFFileNameHere" ofType:@"pdf"];
   NSInteger totalPDFPages = [self getTotalPDFPages:strPDFFilePath];

   //Get total PDF pages height in webView
   CGFloat totalPDFHeight = yourWebViewPDF.scrollView.contentSize.height;
   NSLog ( @"total pdf height: %f", totalPDFHeight);

   //Calculate page height of single PDF page in webView
   NSInteger horizontalPaddingBetweenPages = 10*(totalPDFPages+1);
   CGFloat pageHeight = (totalPDFHeight-horizontalPaddingBetweenPages)/(CGFloat)totalPDFPages;
   NSLog ( @"pdf page height: %f", pageHeight);

   //scroll to specific page --------------- here your page number -----------
   NSInteger specificPageNo = 2;
   if(specificPageNo <= totalPDFPages)
   {
      //calculate offset point in webView
      CGPoint offsetPoint = CGPointMake(0, (10*(specificPageNo-1))+(pageHeight*(specificPageNo-1)));
      //set offset in webView
      [yourWebViewPDF.scrollView setContentOffset:offsetPoint];
   }
}

用于计算总PDF页面

-(NSInteger)getTotalPDFPages:(NSString *)strPDFFilePath
{
   NSURL *pdfUrl = [NSURL fileURLWithPath:strPDFFilePath];
   CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef)pdfUrl);
   size_t pageCount = CGPDFDocumentGetNumberOfPages(document);
   return pageCount;
}

享受编码.....