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copied!<p>An implementation of the response given by @omz could be:<br> (assuming <code>imgBlank</code> is a <code>UIImageView</code> placed on top of the main view of the viewcontroller)</p> <pre><code>-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self.imgBlank]; NSValue *valCurrPoint=[NSValue valueWithCGPoint:CGPointMake(currentPoint.x, currentPoint.y)]; [self.dots addObject:valCurrPoint]; [self performSelector:@selector(draw:) withObject:valCurrPoint afterDelay:0]; } -(void)draw:(NSValue*)pointz{ CGPoint point=[pointz CGPointValue]; UIGraphicsBeginImageContextWithOptions(self.imgBlank.frame.size,NO,0); [self.imgBlank.image drawInRect:CGRectMake(0, 0, self.imgBlank.frame.size.width, self.imgBlank.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); CGContextSetLineWidth(UIGraphicsGetCurrentContext(),tickness);//set the tickness here CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear); CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0f, 1.0f, 1.0f, 1.0); CGContextBeginPath(UIGraphicsGetCurrentContext()); CGContextSetShouldAntialias(UIGraphicsGetCurrentContext(), YES); CGContextMoveToPoint(UIGraphicsGetCurrentContext(), _lastPoint.x, _lastPoint.y); CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), point.x, point.y); CGContextStrokePath(UIGraphicsGetCurrentContext()); self.imgBlank.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); _lastPoint = point; } </code></pre>

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