How to Draw with Touches

gistfile1.m

#pragma mark<Touch Methods>
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    
    UITouch *touch = [touches anyObject];
    
    if ([touch tapCount] == 2) {
        drawImage.image = nil;
        return;
    }
    
    lastPoint = [touch locationInView:self.view];
    lastPoint.y -= 20;
    
    path = CGPathCreateMutable(); //create our fill path
    CGPathMoveToPoint(path, NULL, lastPoint.x, lastPoint.y);
    
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    
    UITouch *touch = [touches anyObject];   
    CGPoint currentPoint = [touch locationInView:self.view];
    currentPoint.y -= 20;
    
    
    UIGraphicsBeginImageContext(self.view.frame.size);
    [drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 0.8);
    CGContextBeginPath(UIGraphicsGetCurrentContext());
    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
    CGContextStrokePath(UIGraphicsGetCurrentContext());
    drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    // add to our fill path
    CGPathAddLineToPoint(path, NULL, currentPoint.x, currentPoint.y);
    
    lastPoint = currentPoint;
    
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    
    UITouch *touch = [touches anyObject];
    
    if ([touch tapCount] == 2) {
        drawImage.image = nil;
        return;
    }
    
    UIGraphicsBeginImageContext(self.view.frame.size);
    [drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    CGPathCloseSubpath(path);
    CGContextSetRGBFillColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 0.7);
    CGContextAddPath(UIGraphicsGetCurrentContext(), path);
    CGContextDrawPath(UIGraphicsGetCurrentContext(), kCGPathEOFill);
    CGContextFillPath(UIGraphicsGetCurrentContext());
    drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGPathRelease(path);
        
}