iOS上的HTML到PDF转换？

Question

我知道获取UIWebView的截图并将其转换为PDF但我需要生成一个正确的pdf(文本作为文本而不是截图).Save2PDF是一个创建适当PDF的应用程序.有人知道他们是怎么做到的吗？

Answer 1

我根据我发现的每一个好建议创建了一个课程.我一直在挖掘很多东西,我希望我的课程能为那些试图直接从某些HTML源代码创建多页PDF的人提供一些良好的开端.

你会在这里找到一些基本的示例代码:https://github.com/iclems/iOS-htmltopdf

我和你有同样的问题,我的要求是: - 完整的PDF(真实文本,没有位图) - 智能多页面(与每X像素切割一个全高度webview相比......)

因此,我使用的解决方案相当不错,因为它采用iOS用来分割打印页面的相同工具.

让我解释一下,我根据Web视图打印格式化程序设置了一个UIPrintPageRenderer(第一个提示):

UIPrintPageRenderer *render = [[UIPrintPageRenderer alloc] init];

[render addPrintFormatter:webView.viewPrintFormatter startingAtPageAtIndex:0];

CGRect printableRect = CGRectMake(self.pageMargins.left,
                              self.pageMargins.top,
                              self.pageSize.width - self.pageMargins.left - self.pageMargins.right,
                              self.pageSize.height - self.pageMargins.top - self.pageMargins.bottom);

CGRect paperRect = CGRectMake(0, 0, self.pageSize.width, self.pageSize.height);

[render setValue:[NSValue valueWithCGRect:paperRect] forKey:@"paperRect"];
[render setValue:[NSValue valueWithCGRect:printableRect] forKey:@"printableRect"];

NSData *pdfData = [render printToPDF];

[pdfData writeToFile: self.PDFpath  atomically: YES];

在此期间,我在UIPrintPageRenderer上创建了一个类别来支持:

- (NSData*) printToPDF
{
    NSMutableData *pdfData = [NSMutableData data];

    UIGraphicsBeginPDFContextToData( pdfData, CGRectZero, nil );

    [self prepareForDrawingPages: NSMakeRange(0, self.numberOfPages)];

    CGRect bounds = UIGraphicsGetPDFContextBounds();

    for ( int i = 0 ; i < self.numberOfPages ; i++ )
    {
        UIGraphicsBeginPDFPage();

        [self drawPageAtIndex: i inRect: bounds];
    }

    UIGraphicsEndPDFContext();

    return pdfData;
}

Answer 2

这个问题的重点是文本作为文本而不是屏幕截图

以下答案展示了如何在 pdf 容器中制作位图屏幕截图...

#import <QuartzCore/CALayer.h>

- (NSString *)pdfPath {
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [paths objectAtIndex:0];
  NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"tmp.pdf"];
  return writableDBPath;
}

- (NSDictionary *)pdfContextDictionary {
  NSDictionary *d = [NSDictionary dictionaryWithObjectsAndKeys:@"J. P. Author", kCGPDFContextAuthor,
                     @"My Cool App", kCGPDFContextCreator,
                     @"This is the Output", kCGPDFContextTitle,
                     nil];
  return d;
}

- (void)printToPDF {
  NSString *path = [self pdfPath];
  UIView *displayView = self.view;
  CGRect pageRect = displayView.bounds;
  if (UIGraphicsBeginPDFContextToFile(path, pageRect, [self pdfContextDictionary]) == NO) {
    return; // error
  }
  UIGraphicsBeginPDFPage();
  CGContextRef context = UIGraphicsGetCurrentContext();
  CALayer *layer = displayView.layer;
  [layer renderInContext:context];
  UIGraphicsEndPDFContext();  
  NSLog(@"[%@ %@] %@", NSStringFromClass([self class]), NSStringFromSelector(_cmd), path);
}