objective-c – IOS嵌入PDF格式的字体

我正在绘制PDF文件,无法弄清楚如何将字体嵌入PDF本身,有人可以帮助我吗？它在设备上显示正常但是一旦通过电子邮件发送或通过AirPrint打印我就会得到后备字体.这是我的代码……

- (void) drawChart{
CGContextRef    currentContext = UIGraphicsGetCurrentContext();
CGContextSetRGBFillColor(currentContext,0.0,1.0);


NSUserDefaults *data = [NSUserDefaults standardUserDefaults];
NSString *pChart1 = [data StringForKey:@"pchart1"];


NSString *textToDraw = [NSString StringWithFormat:@"%@",pChart1];

UIFont *font = [UIFont fontWithName:@"MyFont" size:14];

CGSize StringSize = [textToDraw 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);

[textToDraw drawInRect:renderingRect 
              withFont:font
         lineBreakmode:UILineBreakmodeWordWrap
             alignment:UITextAlignmentLeft];
}

任何帮助将非常感激！