Challenge: Draw a Timer | raywenderlich.com

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1
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/4659-drawing-in-ios-with-core-animation-and-core-graphics/lessons/7
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How can I make the line not move smoothly but jump from second to second?
Thank you very much in advance for your help.

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Instead of the animation in layoutSubviews(), you could try something like this:

  1. Set up a property in ClockView:
var pointerTimer: Timer?
  1. In setup():
pointerTimer = Timer.scheduledTimer(withTimeInterval: 1,
                                    repeats: true) { timer in
  let seconds = Calendar.current.component(.second, from: Date())
  let secondsAngle = CGFloat(seconds) / 60.0 * 2.0 * .pi
  self.pointer.transform = CATransform3DMakeRotation(CGFloat(secondsAngle), 0, 0, 1)
}
  1. Add a method in ClockView to make sure the timer stops on close of view:
  override func removeFromSuperview() {
    pointerTimer?.invalidate()
    pointerTimer = nil
  }
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Thank you very much for your help and understanding :grinning:

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