Objective-C cocoa create PDF from txt - objective-c

Question

I am porting my iOS App to MAC-OS and I am stopped because I cannot create a PDF file programmatically.
What I need to do is to create a PDF from a given .txt file
My code in ios version is this:
- (void) createPDF:(NSString *)fileName withContent:(NSString *)content forSize:(int)fontSize andFont:(NSString *)font andColor:(NSColor *)color{
CGRect a4Page = CGRectMake(0, 0, DOC_WIDTH, DOC_HEIGHT);
NSDictionary *fileMetaData = [[NSDictionary alloc] init];
if (!UIGraphicsBeginPDFContextToFile(fileName, a4Page, fileMetaData )) {
NSLog(#"error creating PDF context");
return;
}
BOOL done = NO;
CGContextRef context = UIGraphicsGetCurrentContext();
CFRange currentRange = CFRangeMake(0, 0);
CGContextSetTextDrawingMode (context, kCGTextFill);
CGContextSelectFont (context, [font cStringUsingEncoding:NSUTF8StringEncoding], fontSize, kCGEncodingMacRoman);
CGContextSetFillColorWithColor(context, [color CGColor]);
// Initialize an attributed string.
CFMutableAttributedStringRef attrString = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);
CFAttributedStringReplaceString (attrString, currentRange, (CFStringRef)content);
// Create the framesetter with the attributed string.
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(attrString);
do {
UIGraphicsBeginPDFPage();
CGMutablePathRef path = CGPathCreateMutable();
CGRect bounds = CGRectMake(LEFT_MARGIN,
TOP_MARGIN,
DOC_WIDTH - RIGHT_MARGIN - LEFT_MARGIN,
DOC_HEIGHT - TOP_MARGIN - BOTTOM_MARGIN);
CGPathAddRect(path, NULL, bounds);
// Create the frame and draw it into the graphics context
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, currentRange, path, NULL);
if(frame) {
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, bounds.origin.y);
CGContextScaleCTM(context, 1, -1);
CGContextTranslateCTM(context, 0, -(bounds.origin.y + bounds.size.height));
CTFrameDraw(frame, context);
CGContextRestoreGState(context);
// Update the current range based on what was drawn.
currentRange = CTFrameGetVisibleStringRange(frame);
currentRange.location += currentRange.length;
currentRange.length = 0;
CFRelease(frame);
}
// If we're at the end of the text, exit the loop.
if (currentRange.location == CFAttributedStringGetLength((CFAttributedStringRef)attrString))
done = YES;
}
while(!done);
UIGraphicsEndPDFContext();}
XCode gives to me a lot of warnings and errors:
Errors: Undefined symbols for architecture x86_64
Warnings: Implicit declaration of function 'UIGraphicsBeginPDFContextToFile' is invalid in C99 [for example]
Could someone help me to find a solution to my problem?
I tried to use CGPDFContextCreateWithURL but I didn't get any result
Thank you all