如何将整个tableview作为一个图像捕获，从中创build一个.pdf并通过电子邮件发送

这是我第一次尝试在iOS中创build.pdf文件。 我有一个tableview，生成所有的数据，我想在.pdf文件中呈现。

这是我的代码捕获整个表作为一个图像，从图像生成PDF并发送电子邮件：

- (IBAction)save:(id)sender { // save all table CGRect frame = self.tableView.frame; frame.size.height = self.tableView.contentSize.height; self.tableView.frame = frame; UIGraphicsBeginImageContextWithOptions(self.tableView.bounds.size, self.tableView.opaque, 0.0); [self.tableView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *saveImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); imageData = UIImagePNGRepresentation(saveImage); UIImage *image = [UIImage imageWithData:imageData]; UIImageView *imageView = [[UIImageView alloc]initWithImage:image]; [self createPDFfromUIView:imageView saveToDocumentsWithFileName:filename]; } - (NSMutableData*)createPDFfromUIView:(UIView*)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); return pdfData; } -(IBAction)back:(id)sender { [self dismissViewControllerAnimated:YES completion:nil]; } -(IBAction)email:(id)sender{ MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init]; mc.mailComposeDelegate = self; UIImage *image = [UIImage imageWithData:imageData]; UIImageView *imageView = [[UIImageView alloc]initWithImage:image]; NSMutableData *pdfData = [self createPDFfromUIView:imageView saveToDocumentsWithFileName:filename]; // Attach an image to the email [mc addAttachmentData:pdfData mimeType:@"application/pdf" fileName:filename]; // Present mail view controller on screen [self presentViewController:mc animated:YES completion:NULL]; } - (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error { switch (result) { case MFMailComposeResultCancelled: NSLog(@"Mail cancelled"); break; case MFMailComposeResultSaved: NSLog(@"Mail saved"); break; case MFMailComposeResultSent: NSLog(@"Mail sent"); break; case MFMailComposeResultFailed: NSLog(@"Mail sent failure: %@", [error localizedDescription]); break; default: break; } // Close the Mail Interface [self dismissViewControllerAnimated:YES completion:NULL]; } 

我已经testing了imageData和捕获是成功的。 PDF生成，但它是一个单一的页面。

期望的结果是由imageData捕获的图像被用来创build多页pdf。

我应该如何调整“createPDFfromUIView”方法，以使用A4标准纸张将长影像文件分成多个页面。

任何帮助将非常感激

Answer 1

试试这个，而不是UIGraphicsBeginImageContextWithOptions

  CGRect priorBounds = self.tableView.bounds; CGSize fittedSize = [self.tableView sizeThatFits:CGSizeMake(priorBounds.size.width, self.tableView.contentSize.height)]; self.tableView.bounds = CGRectMake(0, 0, fittedSize.width, fittedSize.height); CGRect pdfPageBounds = CGRectMake(0, 0, 612, 792); // Change this as your need NSMutableData *pdfData = [[NSMutableData alloc] init]; UIGraphicsBeginPDFContextToData(pdfData, pdfPageBounds, nil); { for (CGFloat pageOriginY = 0; pageOriginY < fittedSize.height; pageOriginY += pdfPageBounds.size.height) { UIGraphicsBeginPDFPageWithInfo(pdfPageBounds, nil); CGContextSaveGState(UIGraphicsGetCurrentContext()); { CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0, -pageOriginY); [self.tableView.layer renderInContext:UIGraphicsGetCurrentContext()]; } CGContextRestoreGState(UIGraphicsGetCurrentContext()); } } UIGraphicsEndPDFContext(); self.tableView.bounds = priorBounds; // Reset the tableView // Use the pdfData to NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory filePathPDF = [documentsPath stringByAppendingPathComponent:@"image.pdf"]; //Add the file name BOOL written = [pdfData writeToFile:filePathPDF atomically:YES];