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Draw Over UIImageView

/ Published in: Objective C
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mainimg is a UIImageView

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  1. - (void) drawLine:(CGPoint) pt {
  2.  
  3.  
  4.     UIGraphicsBeginImageContext(mainimg.frame.size);
  5.     [mainimg.image drawInRect:CGRectMake(0, 0, mainimg.frame.size.width, mainimg.frame.size.height)];
  6.  
  7.     CGContextRef ctx = UIGraphicsGetCurrentContext();
  8.     CGContextSetLineCap(ctx, kCGLineCapButt);
  9.     CGContextSetLineWidth(ctx,2.0);
  10.     CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 1.0);
  11.     CGContextBeginPath(ctx);
  12.     CGContextAddEllipseInRect (ctx,CGRectMake(pt.x-2.0, pt.y-2.0, 4, 4));
  13.     CGContextSetFillColorWithColor(ctx, [UIColor redColor].CGColor);
  14.     CGContextFillPath(ctx);
  15.  
  16.     CGContextStrokePath(ctx);
  17.     mainimg.image = UIGraphicsGetImageFromCurrentImageContext();
  18.     UIGraphicsEndImageContext();
  19. }

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