Core Graphics

画圆

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var path = UIBezierPath(ovalInRect: rect)
   fillColor.setFill()
   path.fill()

创建path

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var plusPath = UIBezierPath()

创建扇形

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//2 - draw the outer arc
var outlinePath = UIBezierPath(arcCenter: center, 
                                  radius: bounds.width/2 - 2.5,
                              startAngle: startAngle, 
                                endAngle: outlineEndAngle,
                               clockwise: true)
 
//3 - draw the inner arc
outlinePath.addArcWithCenter(center, 
                     radius: bounds.width/2 - arcWidth + 2.5,
                 startAngle: outlineEndAngle, 
                   endAngle: startAngle, 
                  clockwise: false)

角度
顺时针 3点钟是0°角