Crash on iOS 9

[IvanGzx]

init(frame: CGRect) {
    super.init() 

    self.setToFrame(frame) // this line
    
    self.fillColor = nil
    self.strokeColor = spinnerColor.cgColor
    self.lineWidth = 1
    
    self.strokeEnd = 0.4
    self.isHidden = true
 }