Edit RTF/DOC file programmatically in xcode/ios - iphone

Question

I have a RTF file which I can view on iphone , Now I need to edit the file programmatically , please let me know how can I do it.
Example
RTF file content
"I am new to StackOverflow"
Now I need to change to below line programmatically.
"I regularly visit StackOverflow" and save as PDF file.
Please do help me :)
Thanks in advance :)

Answer 1

In your .h file add some objects and defines
#define kBorderInset 20.0
#define kBorderWidth 1.0
#define kMarginInset 10.0
#interface ViewController : UIViewController
{
CGSize pageSize;
NSString *pdfFileName;
NSString *contents_for_pdf;
}
- (void)generatePdfWithFilePath:(NSString *)thefilePath;
in .m file add this lines some where on button click to get contents of rtf file in string
NSString *rtf_path = [[NSBundle mainBundle] pathForResource:#"example" ofType:#"rtf"];
contents_for_pdf = [[NSString alloc] initWithContentsOfFile:rtf_path encoding:NSUTF8StringEncoding error:nil];
NSLog(#"%#",contents_for_pdf);
contents_for_pdf = [contents_for_pdf stringByReplacingOccurrencesOfString:#"I am new to StackOverflow" withString:#"I regularly visit StackOverflow"];
pageSize = CGSizeMake(612, 792);
NSString *fileName = #"Demo.pdf";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];
[self generatePdfWithFilePath:pdfFileName];
I didnt modify the text of rtf file,I just used same text in rtf file.you should do as you want(I noticed some encoding characters in text) and function that will generate pdf is here.
- (void) generatePdfWithFilePath: (NSString *)thefilePath
{
UIGraphicsBeginPDFContextToFile(thefilePath, CGRectZero, nil);
//Start a new page.
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil);
//Draw text fo our header.
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(currentContext, 0.0, 0.0, 0.0, 1.0);
UIFont *font = [UIFont systemFontOfSize:14.0];
CGSize stringSize = [contents_for_pdf sizeWithFont:font
constrainedToSize:CGSizeMake(pageSize.width - 2*kBorderInset-2*kMarginInset, pageSize.height - 2*kBorderInset - 2*kMarginInset)
lineBreakMode:UILineBreakModeWordWrap];
CGRect renderingRect = CGRectMake(kBorderInset + kMarginInset, kBorderInset + kMarginInset + 50.0, pageSize.width - 2*kBorderInset - 2*kMarginInset, stringSize.height);
[contents_for_pdf drawInRect:renderingRect
withFont:font
lineBreakMode:UILineBreakModeWordWrap
alignment:UITextAlignmentLeft];
UIGraphicsEndPDFContext();
UIAlertView *Alert = [[UIAlertView alloc] initWithTitle:#"PDF Created" message:#"Sucessfull" delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil, nil];
[Alert show];
}