UIView.animateWithDuration swift loop animation

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No need to do the completion block approach, just use the animation options argument:

updated for Swift 3.0

UIView.animate(withDuration: 2.0, delay: 0, options: [.repeat, .autoreverse], animations: {

    coloredSquare.frame = CGRect(x: 120, y: 220, width: 100, height: 100)

}, completion: nil)

If for any reason you want to stop the animation later, just use:

coloredSquare.layer.removeAllAnimations()

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