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programatically add text on image

/ Published in: Objective C
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  1. -(UIImage *)addText:(UIImage *)img text:(NSString *)text1
  2. {
  3.     //get image width and height
  4.     int w = img.size.width;
  5.     int h = img.size.height;
  6.     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  7.     //create a graphic context with CGBitmapContextCreate
  8.     CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
  9.     CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
  10.     CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);
  11.     char* text = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];
  12.     CGContextSelectFont(context, "Georgia", 30, kCGEncodingMacRoman);
  13.     CGContextSetTextDrawingMode(context, kCGTextFill);
  14.     CGContextSetRGBFillColor(context, 255, 0, 0, 1);
  15.     CGContextSetTextMatrix(context, CGAffineTransformMakeRotation( -M_PI/4 ));
  16.     CGContextShowTextAtPoint(context, 60, 390, text, strlen(text));
  17.     //Create image ref from the context
  18.     CGImageRef imageMasked = CGBitmapContextCreateImage(context);
  19.     CGContextRelease(context);
  20.     CGColorSpaceRelease(colorSpace);
  21.     return [UIImage imageWithCGImage:imageMasked];
  22.  
  23. }

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