How to make a blinking (or flashing) cursor on iphone?

Question

I\'m trying to create a custom \"blinking cursor\" in UIKit, I\'ve tried as shown below, having 2 functions that basically keep calling each other until the cursor is hidden

Answer 1

Matt Long's answer in Swift 4:

func addOpacityAnimation(view: UIView) {
    let key = "opacity"
    let animation = CABasicAnimation(keyPath: key)
    animation.fromValue = 1.0
    animation.toValue = 0.0
    animation.duration = 0.5
    animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
    animation.autoreverses = true
    animation.repeatCount = Float.greatestFiniteMagnitude
    view.layer.add(animation, forKey: key)
}