Dynamic / Moving / Turning / Wheeling version of DonutChartInterfaceController.swift from YOChartImageKit

DonutChartInterfaceController.swift

import WatchKit
import YOChartImageKit

class DonutChartInterfaceController: BaseInterfaceController {
    let chart = YODonutChartImage()
    var frame: CGRect?
    var timer: NSTimer?
    var startAngle = -M_PI_2
    var images: [UIImage]?
    var index = 0

    override func willActivate() {
      super.willActivate()
      chart.donutWidth = 16.0
      chart.labelColor = UIColor.whiteColor()
      chart.values = [30.0, 70.0]
      chart.colors = [UIColor.clearColor(), UIColor.blueColor()]
      frame = CGRectMake(0, 0, contentFrame.width, contentFrame.height / 1.5)
      
      // This is obviously ridiculous! I'm now using UIImage.animatedImageWithImages(_, duration:)
      // But you get the idea...
      timer = NSTimer.scheduledTimerWithTimeInterval(0.1125, target: self, selector: "drawMe", userInfo: nil, repeats: true)
    }
  
    func prepareImages() {
      print(startAngle)
      chart.startAngle = CGFloat(startAngle)
      let chunk = M_PI_4 / 4
      if startAngle > (M_PI + M_PI_2 - chunk) {
        startAngle = -M_PI_2
      } else {
        startAngle += chunk
      }
      let image = chart.drawImage(frame!, scale: WKInterfaceDevice.currentDevice().screenScale)
      if images == nil {
        images = [image]
      } else {
        images?.append(image)
      }
    }
  
    func drawMe() {
      if index < 32 {
        prepareImages()
      } else {
        index = 0
      }
      self.imageView.setImage(images![index])
      index += 1
    }
}