adding link to pdf not working in ios? - ios

Question

I want functionality in which link should be generated in pdf file.When user clicks on that link it should be navigated to that file.For that i have used following code.It has generated the pdf but i am not able to genreate the link.How can i do that?
-(void)generatePDF
{
NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
NSString* documentDirectory = [documentDirectories objectAtIndex:0];
NSString *pdfFileName = [documentDirectory stringByAppendingPathComponent:#"mypdf.pdf"];
UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);
NSString *myString = #"My PDF Heading";
[myString drawInRect:CGRectMake(20, 100, 200, 34) withFont:[UIFont fontWithName:#"HelveticaNeue-Bold" size:13] lineBreakMode:UILineBreakModeWordWrap alignment:UITextAlignmentLeft];
UIGraphicsAddPDFContextDestinationAtPoint(#"Chapter1", CGPointMake(72, 72));
UIGraphicsSetPDFContextDestinationForRect(#"Chapter1", CGRectMake(72, 528, 400, 40));
UIGraphicsEndPDFContext();
[self showPDFFile];
}

Answer 1

Using following code i was able to generate links in pdf and navigate to other page in pdf
-(void)generatePDF
{
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
/// Set line break mode
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
/// Set text alignment
paragraphStyle.alignment = NSTextAlignmentLeft;
NSDictionary *attributes = #{ NSFontAttributeName:[UIFont fontWithName:#"HelveticaNeue-Bold" size:13],NSParagraphStyleAttributeName:paragraphStyle};
NSDictionary *attributes2 = #{ NSFontAttributeName:[UIFont fontWithName:#"HelveticaNeue-Bold" size:13],NSParagraphStyleAttributeName:paragraphStyle,NSBackgroundColorAttributeName:[UIColor yellowColor]};
NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
NSString* documentDirectory = [documentDirectories objectAtIndex:0];
NSString *pdfFileName = [documentDirectory stringByAppendingPathComponent:#"mypdf.pdf"];
UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);
NSString *myString = #"Page1";
[myString drawInRect:CGRectMake(20, 100, 200, 34) withAttributes:attributes];
UIGraphicsAddPDFContextDestinationAtPoint(#"NavigateToPage1", CGPointMake(0, 0));
[self drawTextLink2:#"NavigateToPage3" inFrame:CGRectMake(20, 400, 200, 34)];
[#"Navigate to Page3" drawInRect:CGRectMake(20, 400, 200, 34) withAttributes:attributes];
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);
[#"Page 2" drawInRect:CGRectMake(20, 100, 200, 34)withAttributes:attributes];
[self drawTextLink2:#"NavigateToPage1" inFrame:CGRectMake(20, 400, 200, 34)];
UIGraphicsAddPDFContextDestinationAtPoint(#"NavigateToPage2", CGPointMake(0, 0));
[#"Navigate to Page1" drawInRect:CGRectMake(20, 400, 200, 34) withAttributes:attributes];
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);
[#"Page3" drawInRect:CGRectMake(20, 100, 200, 34) withAttributes:attributes];
[#"Navigate to Page2" drawInRect:CGRectMake(20, 400, 200, 34) withAttributes:attributes];
UIGraphicsAddPDFContextDestinationAtPoint(#"NavigateToPage3", CGPointMake(0, 0));
[self drawTextLink2:#"NavigateToPage2" inFrame:CGRectMake(20, 400, 200, 34)];
UIGraphicsEndPDFContext();
[self showPDFFile];
}
- (void) drawTextLink:(NSString *) text inFrame:(CGRect) frameRect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGAffineTransform ctm = CGContextGetCTM(context);
// Translate the origin to the bottom left.
// Notice that 842 is the size of the PDF page.
CGAffineTransformTranslate(ctm, 0.0, 842);
// Flip the handedness of the coordinate system back to right handed.
CGAffineTransformScale(ctm, 1.0, -1.0);
// Convert the update rectangle to the new coordiante system.
CGRect xformRect = CGRectApplyAffineTransform(frameRect, ctm);
NSLog(#"xformrect is %#",NSStringFromCGRect(xformRect));
NSURL *url = [NSURL URLWithString:text];
UIGraphicsSetPDFContextURLForRect( url, xformRect );
CGContextSaveGState(context);
NSDictionary *attributesDict;
NSMutableAttributedString *attString;
NSNumber *underline = [NSNumber numberWithInt:NSUnderlineStyleSingle];
attributesDict = #{NSUnderlineStyleAttributeName : underline, NSForegroundColorAttributeName : [UIColor blueColor]};
attString = [[NSMutableAttributedString alloc] initWithString:url.absoluteString attributes:attributesDict];
[attString drawInRect:frameRect];
CGContextRestoreGState(context);
}
- (void) drawTextLink2:(NSString *) text inFrame:(CGRect) frameRect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGAffineTransform ctm = CGContextGetCTM(context);
// Translate the origin to the bottom left.
// Notice that 842 is the size of the PDF page.
CGAffineTransformTranslate(ctm, 0.0, 842);
// Flip the handedness of the coordinate system back to right handed.
CGAffineTransformScale(ctm, 1.0, -1.0);
// Convert the update rectangle to the new coordiante system.
CGRect xformRect = CGRectApplyAffineTransform(frameRect, ctm);
// NSURL *url = [NSURL URLWithString:text];
UIGraphicsSetPDFContextDestinationForRect(text, xformRect);
NSLog(#"xfrom rect is %#",NSStringFromCGRect(xformRect));
// UIGraphicsAddPDFContextDestinationAtPoint(text, CGPointMake(0,0));
// UIGraphicsSetPDFContextURLForRect( url, xformRect );
CGContextSaveGState(context);
NSDictionary *attributesDict;
NSMutableAttributedString *attString;
NSNumber *underline = [NSNumber numberWithInt:NSUnderlineStyleSingle];
attributesDict = #{NSUnderlineStyleAttributeName : underline, NSForegroundColorAttributeName : [UIColor blueColor]};
attString = [[NSMutableAttributedString alloc] initWithString:text attributes:attributesDict];
[attString drawInRect:frameRect];
CGContextRestoreGState(context);
}
-(void)showPDFFile
{
NSString* fileName = #"mypdf.pdf";
NSArray *arrayPaths =
NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *path = [arrayPaths objectAtIndex:0];
NSString* pdfFileName = [path stringByAppendingPathComponent:fileName];
UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
NSURL *url = [NSURL fileURLWithPath:pdfFileName];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webView setScalesPageToFit:YES];
webView.delegate=self;
[webView loadRequest:request];
[self.view addSubview:webView];
}