-(CGPathRef)getCGPath:(CGFloat)viewWidth{ UIBezierPath * path = [UIBezierPath bezierPath]; path.lineWidth = 2; [[UIColor whiteColor] setStroke]; [path moveToPoint:CGPointMake((sin(M_1_PI / 180 * 60)) * (viewWidth / 2), (viewWidth / 4))]; [path addLineToPoint:CGPointMake((viewWidth / 2), 0)]; [path addLineToPoint:CGPointMake(viewWidth - ((sin(M_1_PI / 180 * 60)) * (viewWidth / 2)), (viewWidth / 4))]; [path addLineToPoint:CGPointMake(viewWidth - ((sin(M_1_PI / 180 * 60)) * (viewWidth / 2)), (viewWidth / 2) + (viewWidth / 4))]; [path addLineToPoint:CGPointMake((viewWidth / 2), viewWidth)]; [path addLineToPoint:CGPointMake((sin(M_1_PI / 180 * 60)) * (viewWidth / 2), (viewWidth / 2) + (viewWidth / 4))]; [path closePath]; return path.CGPath;}

 CGRect hexagnoRect = self.bounds; //繪制一個六邊形的layer，并復制一個image給他的contents CALayer *hexagonLayer = [CALayer layer]; hexagonLayer.frame = hexagnoRect; CAShapeLayer * shapLayer = [CAShapeLayer layer]; shapLayer.lineWidth = 1; shapLayer.strokeColor = [UIColor whiteColor].CGColor; shapLayer.path = [self getCGPath:hexagnoRect.size.width-20]; hexagonLayer.mask = shapLayer; hexagonLayer.contents = (__bridge id _Nullable)(self.image.CGImage);

 CALayer *completeLayer = [CALayer layer]; completeLayer.frame = CGRectMake(10, 10, self.bounds.size.width-10, self.bounds.size.height-10); [completeLayer addSublayer:hexagonLayer]; completeLayer.shadowOpacity = 1.0f; completeLayer.shadowPath = [self getCGPath:hexagnoRect.size.width]; completeLayer.shadowOffset = CGSizeMake(-10, -10); completeLayer.shadowColor = self.hg_shadowColor.CGColor; [self.layer addSublayer:completeLayer];