如何将整个tableview捕获为图像,从中创建.pdf并通过电子邮件发送 [英] How to capture the whole tableview as an image, create a .pdf from it and email it
问题描述
这是我第一次尝试在iOS中创建.pdf文件。
我有一个tableview,它生成我想要在.pdf文件中呈现的所有数据。
this is my first attempt at creating a .pdf file in iOS. I have a tableview that generates all the data I want to be rendered in a .pdf file.
这是我将整个表格捕获为的代码图像,从图像生成pdf并通过电子邮件发送:
This is my code for capturing the whole table as an image, generating the pdf from the image and emailing it:
- (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];
}
我测试了imageData并且捕获成功。生成pdf但它是单页。
I have tested the imageData and the capture is successful. The pdf gets generated but it is a single page.
理想的结果是 imageData
捕获的图像用于创建多页pdf。
The desired outcome is that the image captured by imageData
is used to create a multipage pdf.
我应该如何调整'createPDFfromUIView'方法,使用A4标准纸将长图像文件分成多页。
How should I adapt the 'createPDFfromUIView' method to separate the long image file into multiple pages using A4 standard paper.
任何非常感谢帮助
推荐答案
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];
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