iOS - 从HTML内容创建多页PDF [英] iOS - Creating multi page PDF from HTML content

问题描述

我有一个很长的html页面，想要将其转换为多页PDF文件。

I have a long html page and wanted to convert it in to a multipage PDF file.

我已按照
apple 和此处 - 如何为给定的字符串内容制作多页PDF 。

但是格式化NSString（有一些类似的数据）比创建一个html页面困难。我创建了这个html并在UIWebView中显示它。

But the formatting the NSString ( with some like data ) is difficult than creating a html page. I have created this html and displaying it in a UIWebView.

现在我想用这个HTML创建一个PDF到多页 PDF文件。

Now I want to create a PDF out of this HTML to a Multi page PDF file.

我正在使用的代码可以创建单个PDF。

The code I'm using can create single PDF.

- (void)createPDFfromUIView:(UIWebView *)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
    // Creates a mutable data object for updating with binary data, like a byte array
    NSMutableData *pdfData = [NSMutableData data];

    // Points the pdf converter to the mutable data object and to the UIView to be converted
    UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();


    // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData

    [aView.layer renderInContext:pdfContext];

    // remove PDF rendering context
    UIGraphicsEndPDFContext();

    // Retrieves the document directories from the iOS device
    NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);

    NSString* documentDirectory = [documentDirectories objectAtIndex:0];
    NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];

    // instructs the mutable data object to write its context to a file on disk
    [pdfData writeToFile:documentDirectoryFilename atomically:YES];
    NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);
}

任何人都可以提供帮助吗？

Can any one give some help ?

推荐答案

我根据我发现的每一个好建议创建了一个类。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的人提供一个良好的开端。

I created a class based on every good advice I found around. I've been digging a lot and I hope my class will offer some good start for anyone trying to create multi-page PDF directly out of some HTML source.

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

You'll find the whole code here with some basic sample code : https://github.com/iclems/iOS-htmltopdf

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

I had just the same issue as you and my requirements were: - full PDF (real text, no bitmap) - smart multi-pages (compared to cutting a full height webview every X pixels...)

因此，我使用的解决方案相当不错，因为它采用了iOS用于拆分的相同工具打印页面。

Thus, the solution I use is pretty nice as it resorts to the same tools iOS uses to split pages for print.

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

Let me explain, I setup a UIPrintPageRenderer based on the web view print formatter (first tip) :

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];

与此同时，我在UIPrintPageRenderer上创建了一个类别来支持：

In the meantime, I have created a category on UIPrintPageRenderer to support:

-(NSData*) printToPDF
{
    [self doNotRasterizeSubviews:self.view];

    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;
}

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