ios - 将 UIWebView 转换为 PDF/Image 仅提供一英寸宽的输出

Question

我正在借助以下代码将 UIWebView 转换为 pdf/image:

    NSString *heightStr = [webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight;"];

    int height = [heightStr intValue];
    CGFloat screenHeight = webView.bounds.size.height;
    int pages = ceil(height / screenHeight);

    NSMutableData *pdfData = [NSMutableData data];
    UIGraphicsBeginPDFContextToData(pdfData, webView.bounds, nil);
    CGRect frame = [webView frame];
    NSMutableArray *imageArray= [[NSMutableArray alloc]init];

    for (int i = 0; i < pages; i++)
    {
        // Check to screenHeight if page draws more than the height of the UIWebView
        if ((i+1) * screenHeight  > height)
        {
            CGRect f = [webView frame];
            f.size.height -= (((i+1) * screenHeight) - height);
            [webView setFrame: f];
        }
        UIGraphicsBeginImageContext(frame.size);

        UIGraphicsBeginPDFPage();
        CGContextRef currentContext = UIGraphicsGetCurrentContext();
        //CGContextTranslateCTM(currentContext, 72, 72); // Translate for 1" margins

        [[[webView subviews] lastObject] setContentOffset:CGPointMake(0, screenHeight * i) animated:NO];
        [webView.layer renderInContext:currentContext];


        UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
        [imageArray insertObject:viewImage atIndex:imageArray.count] ;

        UIGraphicsEndImageContext();
    }

    UIGraphicsEndPDFContext();

    [webView setFrame:frame];

    //Send all images
    NSData *imgData = [self blendImages:imageArray];

  //Final Image
  UIImage *finalImage = [UIImage imageWithData:imgData];

-(NSData*)blendImages:(NSMutableArray *)arrImage{
    // get data from document

    CGFloat height=0 ,width=0  ;
    UIImage *tempImg = [arrImage objectAtIndex:0] ;
    width =tempImg.size.width ;

    for (int i = 0 ; i<arrImage.count ; i++){
        UIImage *img=  [arrImage objectAtIndex:i];
        height = img.size.height +height;
    }
    CGSize size = CGSizeMake(width, height) ;
    UIGraphicsBeginImageContext(size);
    CGFloat h = 0;
    for (int i=0; i<arrImage.count; i++) {
        UIImage* uiimage = [arrImage objectAtIndex:i];
        [uiimage drawAtPoint:CGPointMake(0, h) blendMode:kCGBlendModeNormal alpha:1.0];
        h = uiimage.size.height +h ;
    }
    NSData *imageData = UIImagePNGRepresentation(UIGraphicsGetImageFromCurrentImageContext());
    UIGraphicsEndImageContext();

    return imageData;
}

但我只能得到一英寸宽的输出。此外，整个包含适合一页，使其不可读。如何制作A4大小的输出？

Answer 1

这会创建网页屏幕截图的 PDF - 可能有助于您入门 :)

  - (IBAction)makePDF:(id)sender
  {
      UIGraphicsBeginImageContextWithOptions(webView.scrollView.contentSize, webView.scrollView.opaque, 0.0);

      webView.scrollView.contentOffset = CGPointZero;
      webView.scrollView.frame = CGRectMake(0, 0, webView.scrollView.contentSize.width, webView.scrollView.contentSize.height);
      [webView.scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
      UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
      UIGraphicsEndImageContext();

      CGRect imageFrame = CGRectMake(0, 0, image.size.width, image.size.height);

      NSMutableData *pdfData = [NSMutableData data];
      UIGraphicsBeginPDFContextToData(pdfData, imageFrame, nil);

      //full screenshot
      UIGraphicsBeginPDFPage();
      UIImageView *imageView = [[UIImageView alloc] initWithFrame:imageFrame];
      [imageView setContentMode:UIViewContentModeScaleAspectFit];
      [imageView setImage:image];
      [imageView.layer renderInContext:UIGraphicsGetCurrentContext()];
      UIGraphicsEndPDFContext();

      NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
      NSString *documentDirectory = [documentDirectories objectAtIndex:0];
      NSString *fileName = [NSString stringWithFormat:@"%@.pdf",[NSDate date]];
      NSString *path = [documentDirectory stringByAppendingPathComponent:fileName];

      // save to disk
      [pdfData writeToFile:path atomically:YES];
      NSLog(@"pdf in %@", path);
  }