核心图形绘制同心圆并填补它们之间的空白

您可以使用以下代码：

    
        let path = CGMutablePath()
    let radius = min(rect.width/2, rect.height/2)
let center = CGPoint(x: rect.width/2, y: rect.height/2)
path.addEllipse(in: CGRect(x: center.x - radius, y: center.y - radius, width: 2*radius, height: 2*radius))
let path2 = CGMutablePath()
path2.addEllipse(in: CGRect(x: center.x - radius/2, y: center.y - radius/2, width: radius, height: radius))
   path.addPath(path2)
    context.addPath(path)
context.drawPath(using: .eoFill)
//inner part
   let path3 = CGMutablePath()
    path3.addEllipse(in: CGRect(x: center.x - radius/2, y: center.y - radius/2, width: radius, height: radius))
      context.addPath(path3)
    context.setFillColor(UIColor.green.cgColor)
context.fillPath()
</code>