let pulseAnimation = CABasicAnimation(keyPath: #keyPath(CALayer.opacity))
pulseAnimation.duration = 1
pulseAnimation.fromValue = 0
pulseAnimation.toValue = 1
pulseAnimation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
pulseAnimation.autoreverses = true
pulseAnimation.repeatCount = .greatestFiniteMagnitude
view.layer.add(pulseAnimation, forKey: "animateOpacity")
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