CAShapeLayer阴影

鉴于下面的CAShapeLayer是可能的添加像阴影下面的图像的投影？

我正在使用UIBezierPath来绘制条形图。

 - (CAShapeLayer *)gaugeCircleLayer { if (_gaugeCircleLayer == nil) { _gaugeCircleLayer = [CAShapeLayer layer]; _gaugeCircleLayer.lineWidth = self.gaugeWidth; _gaugeCircleLayer.fillColor = [UIColor clearColor].CGColor; _gaugeCircleLayer.strokeColor = self.gaugeTintColor.CGColor; _gaugeCircleLayer.strokeStart = 0.0f; _gaugeCircleLayer.strokeEnd = self.value; _gaugeCircleLayer.lineCap = kCALineCapRound; _gaugeCircleLayer.masksToBounds = NO; _gaugeCircleLayer.cornerRadius = 8.0; _gaugeCircleLayer.shadowRadius = 8.0; _gaugeCircleLayer.shadowColor = [UIColor blackColor].CGColor; _gaugeCircleLayer.shadowOpacity = 0.5; _gaugeCircleLayer.shadowOffset = CGSizeMake(0.0, 0.0); _gaugeCircleLayer.path = [self circlPathForCurrentGaugeStyle].CGPath; } return _gaugeCircleLayer; } 

这将需要应用到这个UIBezierPath ：

 - (UIBezierPath *)insideCirclePath { CGPoint arcCenter = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds)); UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:arcCenter radius:CGRectGetWidth(self.bounds) / 2.0f startAngle:(3.0f * M_PI_2) endAngle:(3.0f * M_PI_2) + (2.0f * M_PI) clockwise:YES]; _titleTextLabel.textColor = self.gaugeTintColor; return path; } 

Answer 1

非常大致：

  let arc1 = CAShapeLayer() arc1.lineWidth = 20.0 arc1.path = UIBezierPath(ovalInRect: CGRectMake(10, 10, 80, 80)).CGPath arc1.strokeStart = 0 arc1.strokeEnd = 0.5 arc1.strokeColor = UIColor.grayColor().CGColor arc1.fillColor = UIColor.clearColor().CGColor layer.addSublayer(arc1) let cap = CAShapeLayer() cap.shadowColor = UIColor.blackColor().CGColor cap.shadowRadius = 8.0 cap.shadowOpacity = 0.9 cap.shadowOffset = CGSize(width: 0, height: 0) cap.path = UIBezierPath(ovalInRect: CGRectMake(0, 40, 20, 20)).CGPath cap.fillColor = UIColor.grayColor().CGColor layer.addSublayer(cap) let arc2 = CAShapeLayer() arc2.lineWidth = 20.0 arc2.path = UIBezierPath(ovalInRect: CGRectMake(10, 10, 80, 80)).CGPath arc2.strokeStart = 0.5 arc2.strokeEnd = 1.0 arc2.strokeColor = UIColor.grayColor().CGColor arc2.fillColor = UIColor.clearColor().CGColor layer.addSublayer(arc2) 

我觉得你需要两个弧，一个有阴影的帽子圈。