After we insert a textField annotation, we save it with the pdf page, the textField is disappeared, but it is really saved to the pdf.

[gyx8899]

When I encounter this problem, i am so surprised with the "right" code in drawing text String.
After server days, I found the key of the problem. My code are following:

• (void) drawInContext:(CGContextRef)context {
  UIGraphicsPushContext(context); // key 1

  CGContextSetTextMatrix(context, CGAffineTransformMake(1.0,0.0, 0.0, -1.0, 0.0, 0.0));
  CGContextSetTextDrawingMode(context, kCGTextFill); // This is the default
  CGContextSetFillColorWithColor(context, [[UIColor blackColor] CGColor]);
  [self.text drawInRect:self.rect withAttributes:@{NSFontAttributeName:self.font}];

  UIGraphicsPopContext(); // key 2
  }