#iOS PDF programming is still not that difficult. Now we dive into #PDF itself ;)

Av
In the last post I described how to "draw" on iOS, which served me well in getting me started on iOS PDF programming.
Now I will combine Apple's print tutorial for iOS and what I've learned about drawing:
As with "drawing", writing PDF isn't that complicated if you sit down and decipher it. And  Apple's print tutorial for iOS does a good job explaining it. But sadly, the tutorial has a bug in this call. The tutorial wrongly writes:
currentRange = [self renderPageWithTextRange:currentRange andFramesetter:framesetter];
instead of the correct:
currentRange = [self renderPage:currentPage withTextRange:currentRange andFramesetter:framesetter];

So I got this part running pretty well with the following code:

- (IBAction)savePDFFile:(id)sender

{
    NSString* path = [[NSBundle mainBundle] pathForResource:@"sampleData" ofType:@"plist"];
    
    // get a temprorary filename for this PDF
    path = NSTemporaryDirectory();
    self.pdfFilePath = [path stringByAppendingPathComponent:
                        [NSString stringWithFormat:@"%d.pdf", 
                        [[NSDate date] 
                        timeIntervalSince1970] ]];
    
   // Prepare the text using a Core Text Framesetter
    CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, 
                                (CFStringRef)textView.text, NULL);
    if (currentText) {
        CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText);
        if (framesetter) {
            
            NSString* pdfFileName = self.pdfFilePath; //[NSString stringWithString:@"test.pdf"];
            
            // Create the PDF context using the default page: currently constants at the size 
            // of 612 x 792.
            UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
            
            CFRange currentRange = CFRangeMake(0, 0);
            NSInteger currentPage = 0;
            BOOL done = NO;
            
            do {
                // Mark the beginning of a new page.
                UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, kDefaultPageWidth, 
                                                          kDefaultPageHeight), nil);
                
                // Draw a page number at the bottom of each page
                currentPage++;
                [self drawPageNumber:currentPage];
                
                // Render the current page and update the current range to
                // point to the beginning of the next page.
                currentRange = [self renderPage:currentPage withTextRange:
                                currentRange andFramesetter:framesetter];
                
                // If we're at the end of the text, exit the loop.
                if (currentRange.location == CFAttributedStringGetLength
                    ((CFAttributedStringRef)currentText))
                    done = YES;
            } while (!done);
            
            // Close the PDF context and write the contents out.
            UIGraphicsEndPDFContext();
            
            // Release the framewetter.
            CFRelease(framesetter);
            
        } else {
            NSLog(@"Could not create the framesetter needed to lay out the atrributed string.");
        }
        // Release the attributed string.
        CFRelease(currentText);
    } else {
        NSLog(@"Could not create the attributed string for the framesetter");
    }    
}
The problem was that I couldn't verify if the PDF was written to the iPhone or not. In the next post I will describe how I combined it with code from Spitzkoff.

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