import Foundation
import UIKit

extension UIView {
    func fadeIn(_ duration: TimeInterval = 1.0, delay: TimeInterval = 0.0, completion: @escaping ((Bool) -> Void) = {(finished: Bool) -> Void in}) {
        UIView.animate(withDuration: duration, delay: delay, options: UIViewAnimationOptions.curveEaseIn, animations: {
            self.alpha = 1.0
            }, completion: completion)  }
    
    func fadeOut(_ duration: TimeInterval = 1.0, delay: TimeInterval = 0.0, completion: @escaping (Bool) -> Void = {(finished: Bool) -> Void in}) {
        UIView.animate(withDuration: duration, delay: delay, options: UIViewAnimationOptions.curveEaseIn, animations: {
            self.alpha = 0.0
            }, completion: completion)
    }
}

//  Usage
// self.label.fadeOut(completion: {
//     (finished: Bool) -> Void in
//     self.label.text = "Replacement text"
//     self.label.fadeIn()
// })