Getting blur stroked while drawing in Cglayer - ios

Question

I am working with a drawing app where I draw inside CGlayers and then draw on grahics context, but I drawing is getting blurred.
Here is my code
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();//Get a reference to current context(The context to draw)
NSLog(#"Size1%#", NSStringFromCGRect(self.bounds));
if(self.currentDrawingLayer == nil)
{
self.currentDrawingLayer = CGLayerCreateWithContext(context, self.bounds.size, NULL);
}
CGPoint mid1 = midPoint(m_previousPoint1, m_previousPoint2);
CGPoint mid2 = midPoint(m_currentPoint, m_previousPoint1);
CGContextRef layerContext = CGLayerGetContext(self.currentDrawingLayer);
// UIGraphicsBeginImageContextWithOptions(self.bounds.size,YES,0.0);
CGContextSetLineCap(layerContext, kCGLineCapRound);
CGContextSetBlendMode(layerContext, kCGBlendModeNormal);
CGContextSetLineJoin(layerContext, kCGLineJoinRound);
CGContextSetLineWidth(layerContext, self.lineWidth);
CGContextSetStrokeColorWithColor(layerContext, self.lineColor.CGColor);
CGContextSetShouldAntialias(layerContext, YES);
CGContextSetAllowsAntialiasing(layerContext, YES);
CGContextSetAlpha(layerContext, self.lineAlpha);
CGContextSetFlatness(layerContext, 1.0f);
CGContextBeginPath(layerContext);
CGContextMoveToPoint(layerContext, mid1.x, mid1.y);//Position the current point
CGContextAddQuadCurveToPoint(layerContext, m_previousPoint1.x, m_previousPoint1.y, mid2.x, mid2.y);
CGContextStrokePath(layerContext);//paints(fills) the line along the current path.
CGContextDrawLayerInRect(context, self.bounds, self.currentDrawingLayer);
}
I get blurr strokes with this code, according to docs, whenever we create the CGlayer with graphicsContext, they say that it will provide the resolution of the device, but then why I am getting blur lines.
Here is the image of blur lines
Regards
Ranjit

Answer 1

Substitute this in your code where you create your CGLayer:
if(self.currentDrawingLayer == nil)
{
CGFloat scale = self.contentScaleFactor;
CGRect bounds = CGRectMake(0, 0, self.bounds.size.width * scale, self.bounds.size.height * scale);
CGLayerRef layer = CGLayerCreateWithContext(context, bounds.size, NULL);
CGContextRef layerContext = CGLayerGetContext(layer);
CGContextScaleCTM(layerContext, scale, scale);
self.currentDrawingLayer = layer;
}