将html文件转换为PDF使用Cocoa-Touch的iOS文档

Question

我想将iPhone上的本地HTML文件转换为PDF文档。我已经使用了我在网上找到的以下代码来从图片生成PDF文件，我试图用html文件替换图片，但是失败了。我非常感谢你的帮助。 由于提前，

// Our method to create a PDF file natively on the iPhone 
// This method takes two parameters, a CGRect for size and 
// a const char, which will be the name of our pdf file 
void CreatePDFFile (CGRect pageRect, const char *filename) { 

    // This code block sets up our PDF Context so that we can draw to it 
    CGContextRef pdfContext; 
    CFStringRef path; 
    CFURLRef url; 
    CFMutableDictionaryRef myDictionary = NULL; 
    // Create a CFString from the filename we provide to this method when we call it 
    path = CFStringCreateWithCString (NULL, filename, 
             kCFStringEncodingUTF8); 
    // Create a CFURL using the CFString we just defined 
    url = CFURLCreateWithFileSystemPath (NULL, path, 
             kCFURLPOSIXPathStyle, 0); 
    CFRelease (path); 
    // This dictionary contains extra options mostly for 'signing' the PDF 
    myDictionary = CFDictionaryCreateMutable(NULL, 0, 
              &kCFTypeDictionaryKeyCallBacks, 
              &kCFTypeDictionaryValueCallBacks); 
    CFDictionarySetValue(myDictionary, kCGPDFContextTitle, CFSTR("My PDF File")); 
    CFDictionarySetValue(myDictionary, kCGPDFContextCreator, CFSTR("My Name")); 
    // Create our PDF Context with the CFURL, the CGRect we provide, and the above defined dictionary 
    pdfContext = CGPDFContextCreateWithURL (url, &pageRect, myDictionary); 
    // Cleanup our mess 
    CFRelease(myDictionary); 
    CFRelease(url); 
    // Done creating our PDF Context, now it's time to draw to it 

    // Starts our first page 
    CGContextBeginPage (pdfContext, &pageRect); 

    // Draws a black rectangle around the page inset by 50 on all sides 
    CGContextStrokeRect(pdfContext, CGRectMake(50, 50, pageRect.size.width - 100, pageRect.size.height - 100)); 

    // This code block will create an image that we then draw to the page 
    const char *picture = "Picture"; 
    CGImageRef image; 
    CGDataProviderRef provider; 
    CFStringRef picturePath; 
    CFURLRef pictureURL; 

    picturePath = CFStringCreateWithCString (NULL, picture, 
             kCFStringEncodingUTF8); 
    pictureURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), picturePath, CFSTR("png"), NULL); 
    CFRelease(picturePath); 
    provider = CGDataProviderCreateWithURL (pictureURL); 
    CFRelease (pictureURL); 
    image = CGImageCreateWithPNGDataProvider (provider, NULL, true, kCGRenderingIntentDefault); 
    CGDataProviderRelease (provider); 
    CGContextDrawImage (pdfContext, CGRectMake(200, 200, 207, 385),image); 
    CGImageRelease (image); 


    // End image code 

    // Adding some text on top of the image we just added 
    CGContextSelectFont (pdfContext, "Helvetica", 16, kCGEncodingMacRoman); 
    CGContextSetTextDrawingMode (pdfContext, kCGTextFill); 
    CGContextSetRGBFillColor (pdfContext, 0, 0, 0, 1); 
    const char *text = "Hello World!"; 
    CGContextShowTextAtPoint (pdfContext, 260, 390, text, strlen(text)); 
    // End text 

    // We are done drawing to this page, let's end it 
    // We could add as many pages as we wanted using CGContextBeginPage/CGContextEndPage 
    CGContextEndPage (pdfContext); 

    // We are done with our context now, so we release it 
    CGContextRelease (pdfContext); 
} 

- (IBAction)createPDF:(id)sender { 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *saveDirectory = [paths objectAtIndex:0]; 
    NSString *saveFileName = @"myPDF.pdf"; 
    NSString *newFilePath = [saveDirectory stringByAppendingPathComponent:saveFileName]; 
    const char *filename = [newFilePath UTF8String]; 
    CreatePDFFile(CGRectMake(0, 0, 612, 792),filename); 
} 

Answer 1

将HTML转换为PDF格式，你需要：

• 创建一个web视图并加载HTML。
• 采取Webview捕获。
• 将其转换成PDF文件。

第二步（的WebView捕获）都必须做一次您的WebView内容加载 对于这种捕获你可以找到样品中How Do I Take a Screen Shot of a UIView? 然后使用此背景下转换成PDF文件。

对于web视图，您不需要显示它，只需在屏幕上添加视图即可创建它。

编辑： 其他细节，为的WebView高度可以计算的WebView内容高度和改变你的WebView框架

- (void)webViewDidFinishLoad:(UIWebView *)theWebView { 
    NSUInteger contentHeight = [[theWebView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.body.scrollHeight;"]] intValue]; 
    NSUInteger contentWidth = [[theWebView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.body.scrollWidth;"]] intValue]; 
    [theWebView setFrame:CGRectMake(0, 0, contentWidth, contentHeight)]; 
} 

Answer 2

我创建了一个基于每一个很好的建议，我发现周围的类。我一直在挖掘很多，我希望我的课程能够为尝试从某些HTML源代码直接创建多页PDF的人提供一些良好的开端。

你会一些基本的示例代码在这里找到整个代码：https://github.com/iclems/iOS-htmltopdf

我刚刚同一个问题，因为你和我的要求是： - 完整的PDF（真正的文本，没有位图） - 智能多页（与每X像素切割全高度webview相比...）

因此，我使用的解决方案非常好，因为它使用iOS用于分割页面以供打印的相同工具。

让我解释一下，我安装一个UIPrintPageRenderer基于Web视图的打印格式（第一尖）：

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，我创建了UIPrintPageRenderer类别支持：

-(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; 
}