class ChartView: UIView
{
  class: DotView {
    let circleView1: UIView
    let circleView2: UIView

    init (view: UIView)
    {
      self.view = view
      self.circleView1 = self.buildCircle(some rect here)
      self.circleView2 = self.buildCircle(some rect here)

    func buildCircle(rect: CGRect) -> UIView
    {
       let dotView = UIView(frame: rect)
       dotView.backgroundColor = UIColor.whiteColor()
       dotView.layer.cornerRadius = dotView.bounds.width / 2
       self.view.addSubview(dotView)
       return dotView
    }
  }
}

但我得到了这个错误：
在初始化所有存储的属性之前,在方法调用’buildCircle’中使用’self’

所以我只想在某个方法中创建对象,然后将其分配给存储的属性.我该如何修复我的代码？