showing shdow to uibiezierpath

Question

I use the following code to draw a triangle shape,I want to apply shadow for this shape i have drawn using bezierpath.

CGContextRef context = UIGraphicsGetCurrentContext();
    //creating a new nsshadow
    NSShadow* shadow = [[NSShadow alloc] init];
    [shadow setShadowColor: UIColor.blackColor];
    [shadow setShadowOffset: CGSizeMake(3.1, 3.1)];
    [shadow setShadowBlurRadius: 5];       

    //view to add a bezier path
    UIView *triangleView = [[UIView alloc] initWithFrame:CGRectMake(67.0f,33.4f, 40.0f ,20.0f)];

    // code for drawing a triangular shape
    UIBezierPath* trianglePath = [UIBezierPath bezierPath];
    [trianglePath moveToPoint:CGPointMake(0, 0)];

    [trianglePath addQuadCurveToPoint:CGPointMake(7.0f, 3.0f) controlPoint:CGPointMake(4.0f, 0.0f)];

    [trianglePath addLineToPoint:CGPointMake(17.0f,15.0f)];

    [trianglePath addQuadCurveToPoint:CGPointMake(23.0f,15.0f) controlPoint:CGPointMake(20.0f, 20.0f)];

    [trianglePath addLineToPoint:CGPointMake(33.0f, 3.0f)];

    [trianglePath addQuadCurveToPoint:CGPointMake(40.0, 0.0f) controlPoint:CGPointMake(36.5f, 0.0f)];
    [trianglePath addLineToPoint:CGPointMake(0.0f, 0.0f)];


    CGContextAddPath(context, trianglePath.CGPath);      
    CGContextSaveGState(context);
    CGContextSetShadowWithColor(context, shadow.shadowOffset, shadow.shadowBlurRadius, [shadow.shadowColor CGColor]);
    [UIColor.redColor setFill];
    [trianglePath fill];
    CGContextRestoreGState(context);

    [UIColor.blackColor setStroke];
    trianglePath.lineWidth = 1;
    [trianglePath stroke];
    CGContextFillPath(context);

    //CAShapeLayer to set the bezier path
    CAShapeLayer *triangleMaskLayer = [CAShapeLayer layer];
    [triangleMaskLayer setPath:trianglePath.CGPath];

    triangleMaskLayer.lineWidth = 0.1f;
    triangleMaskLayer.fillColor = [[UIColor whiteColor] CGColor];   

    [triangleView.layer addSublayer:triangleMaskLayer];

I want to set a shadow for this uibezier path? I have tried using some ways but unable to figure out what,s going wrong?

Answer 1

try by setting shadow properties to CAShapeLayer like below:

    CAShapeLayer *triangleMaskLayer = [CAShapeLayer layer];

    triangleMaskLayer.shadowColor=[UIColor blackColor].CGColor;
    triangleMaskLayer.shadowOffset=CGSizeMake(3.1, 3.1);
    triangleMaskLayer.shadowRadius=5.0;

    [triangleView.layer addSublayer:triangleMaskLayer];