ios - UIBezierPath 未按预期更新

Question

这是我的自定义 View 代码:

class CircleView3: UIView {
    let endPoint = 270.0
    var index = 0.0
    var startPoint: Double {
        get{
            index++
            let div = 360.0/60.0
            let vaule = div * index
            return 290.0 + vaule
        }
    }

    func degreesToRadians (number: Double) -> CGFloat {
        return CGFloat(number) * CGFloat(M_PI) / 180.0
    }

    override func drawRect(rect: CGRect) {
          super.drawRect(rect)
        let startAngleRadiant: CGFloat = degreesToRadians(startPoint)
        let endAngleRadiant: CGFloat = degreesToRadians(endPoint)
        print("start = \(startAngleRadiant)")
        print("end = \(endAngleRadiant)")
        let center = CGPoint(x: bounds.midX, y: bounds.midY)
        let path = UIBezierPath()
        path.moveToPoint(center)
        path.addArcWithCenter(center, radius: self.frame.height/2.2, startAngle: startAngleRadiant, endAngle: endAngleRadiant, clockwise: true)
        path.addLineToPoint(center)
        let strokeColor: UIColor = UIColor(red: 155.0/255.0, green: 137.0/255.0, blue: 22.0/255.0, alpha: 1.0)
        strokeColor.setFill()  //strokeColor.setStroke()
        path.fill()
        path.stroke()
    }
}

我正在画一个圆。我每秒从 View Controller 调用 setNeedsDisplay 函数。我应该绘制一个每秒减少其起点和终点的圆圈，但即使在更新后圆圈仍保持其最后一行(位置)。另外，圆圈没有填充我的颜色，只是填充了线条。

http://www.mediafire.com/watch/xnkew5eu8da5wub/IMG_0066.MOV

更新

我在 drawRect 中打印起始值，这些值是正确的:

start  = 293.6
start  = 297.2
start  = 300.8
start  = 304.4
start  = 308.0
start  = 311.6
start  = 315.2
start  = 318.8
start  = 322.4
start  = 326.0
start  = 329.6
start  = 333.2
start  = 336.8
start  = 340.4

当然，这些是在将它们更改为弧度之前的值。

更新2

在我调用 strokeColor.setFill() 之后，情况好多了，但我仍然看到问题。请观看这个新视频:

http://www.mediafire.com/watch/nb1b3v2zgqletwb/IMG_0069.MOV

Answer 1

就其值(value)而言，我将您的代码放入一个项目中，我看到一个缩小的圆圈，因为在 customView 上调用了 setNeedsDisplay。它不像您的视频那样绘制。

这是我的附加代码:

class ViewController: UIViewController {

    @IBOutlet weak var circleView: CircleView3!

    override func viewDidLoad() {
        super.viewDidLoad()
        NSTimer.scheduledTimerWithTimeInterval(0.25, target: self, selector: "updateCircle", userInfo: nil, repeats: true)
    }

    func updateCircle() {
        circleView.setNeedsDisplay()
    }
}