Настроить изменение размера цвета mdcactivityIndicator swift

view.addSubview(activityIndicator)
activityIndicator.sizeToFit()
activityIndicator.autoCenterInSuperview()
activityIndicator.indicatorMode = .indeterminate
activityIndicator.cycleColors = [MaterialTwitterClient.colorAccent]
activityIndicator.radius = 16
activityIndicator.startAnimating()
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