如何在iOS上通过电子邮件发送pdf文档的当前页面

Question

我制作了一个包含pdf文件的图书馆应用。 我用fastpdfkit读取pdf。

但是没有解决方案只能发送一页pdf文件。

是否可以通过电子邮件发送pdf文件而不是整个文档的当前页面？

Answer 1

如果您要将图像缩放到一页，可以使用此

UIImage *currentPage = [UIImage drawCurrentView:currentPageNum];

这是drawCurrentView：

+(UIImage*)drawCurrentView:(NSUInteger)currentPageNum
{

NSString *filePath = //Your PDF Path

CGSize resultImageSize = CGSizeMake(320, 480);//For iPhone

CFStringRef pathRef = CFStringCreateWithCString (NULL, [filePath UTF8String],
                                                 kCFStringEncodingUTF8);
CFURLRef pdfURL = CFURLCreateWithFileSystemPath (NULL, pathRef,
                                                 kCFURLPOSIXPathStyle, 0);
CFRelease(pathRef);
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL(pdfURL);

CFRelease(pdfURL);
CGPDFPageRef myPageRef = CGPDFDocumentGetPage(pdf,currentPageNum);

// get the rect of our page
CGRect pageRect = CGPDFPageGetBoxRect(myPageRef, kCGPDFCropBox);

// create a new context for resulting image of my desidered size
UIGraphicsBeginImageContext(resultImageSize);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSaveGState(ctx);
CGContextScaleCTM(ctx, 1, -1);

// translate so the origin is offset by exactly the rect origin
CGContextTranslateCTM(ctx, 0, -resultImageSize.height);
CGContextScaleCTM(ctx, resultImageSize.width /pageRect.size.width,resultImageSize.height/ pageRect.size.height);

// now draw the document
CGContextDrawPDFPage(ctx, myPageRef);
CGContextRestoreGState(ctx);

// generate image
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();  
UIGraphicsEndImageContext();
CGPDFDocumentRelease(pdf); 

return resultingImage;
}