UIView+Extension.swift

import UIKit

extension UIView {
    
    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
            layer.masksToBounds = newValue > 0
        }
    }
    
    @IBInspectable var borderWidth: CGFloat {
        get {
            return layer.borderWidth
        }
        set {
            layer.borderWidth = newValue
        }
    }
    
    @IBInspectable var borderColor: UIColor? {
        get {
            return UIColor(cgColor: layer.borderColor!)
        }
        set {
            layer.borderColor = newValue?.cgColor
        }
    }
    
    func fadeIn(duration: TimeInterval, delay: TimeInterval = 0, targetAlpha: CGFloat = 1, completed: (() -> ())? = nil) {
        if self.alpha == 1 {
            self.alpha = 0
        }
        self.isHidden = false
        
        UIView.animate(withDuration: duration,
                       delay: delay,
                       options: .curveEaseOut,
                       animations: {
            self.alpha = targetAlpha
        }) { finished in
            completed?()
        }
    }
    
    func fadeOut(duration: TimeInterval, delay: TimeInterval = 0, targetAlpha: CGFloat = 0, completed: (() -> ())? = nil) {
        UIView.animate(withDuration: duration,
                       delay: delay,
                       options: .curveEaseOut,
                       animations: {
            self.alpha = targetAlpha
        }) { [weak self] finished in
            if targetAlpha == 0 {
                self?.isHidden = true
            }
            completed?()
        }
    }
    
}