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    <p>I would scrap the timer and do move it in <code>touchesMoved</code>.</p> <p>My solution lets you draw on a UIImageView canvas and has a white box follow your finger while you're drawing. Drop it into any UIView to try it out:</p> <pre><code>// These should probably be @properties static CGPoint lastPoint; static CGPoint currentPoint; static UIView *box; static UIImageView *canvas; - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; currentPoint = [touch locationInView:self]; lastPoint = [touch locationInView:self]; // Create the canvas the first time. Should probably do this elsewhere // but done here for paste-ability if (canvas == nil) { canvas = [[UIImageView alloc] initWithFrame:self.frame]; canvas.backgroundColor = [UIColor redColor]; [self addSubview:canvas]; } // Create the box that follows the finger. Should probably do this elsewhere // but done here for paste-ability if (box == nil) { box = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)]; box.backgroundColor = [UIColor whiteColor]; [self addSubview:box]; } // Ensure we can see it and move it right away box.alpha = 1.0f; box.center = CGPointMake(currentPoint.x, currentPoint.y - 50); } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; currentPoint = [touch locationInView:self]; // Set up everything for drawing UIGraphicsBeginImageContext(canvas.frame.size); CGContextRef context = UIGraphicsGetCurrentContext(); [canvas.image drawInRect:CGRectMake(0, 0, canvas.image.size.width, canvas.image.size.height)]; CGContextSetLineCap(context, kCGLineCapRound); CGContextSetLineWidth(context, 1); CGContextSetStrokeColorWithColor (context, [UIColor blueColor].CGColor); // Draw the path CGContextBeginPath(context); CGContextMoveToPoint(context, lastPoint.x, lastPoint.y); CGContextAddLineToPoint(context, currentPoint.x, currentPoint.y); CGContextStrokePath(context); canvas.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); // Animate the box very quickly to the new location [UIView animateWithDuration:0.1f delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ box.center = CGPointMake(box.center.x + (currentPoint.x - lastPoint.x), box.center.y + (currentPoint.y - lastPoint.y)); } completion:nil]; // Remember our last touch lastPoint = currentPoint; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { // Finish it off by fading out the box [UIView animateWithDuration:0.4f animations:^{ box.alpha = 0.0f; }]; } </code></pre>
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    1. PODraw line on Swiping Finger with Arrow following the Swipe path
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    1. USPaulo Fierro
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    1. COIt will draw the line with the finger move, But I need to move the arrow also at the same time on the line, So you dont think that they will concide with each other. For moving arrow, I am using timer, which is called every .01 seconds.
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    2. COGotcha, original question didn't mention keeping the arrow on the line :) To do that just set the box.center to be equal to the lastPoint. If you don't want a slight animation you could just get rid of the animation block in touchesMoved:withEvent:.
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