paiai_ios/PaiAi/PaiaiUIKit/Reusable/UIKit/NavigationBar/NavigationBarInOut.swift

//
//  NavigationBarInOut.swift
//  PaiaiUIKit
//
//  Created by ffib on 2019/1/15.
//  Copyright © 2019 yb. All rights reserved.
//

import UIKit

public protocol NavigationBarInOut: class {
    var navigationView: UIView { get }
    func navigationBarFadeIn()
    func navigationBarFadeOut()
    func navigationBarFadeOutWithPercentage(_ percentage: CGFloat)
}

public extension NavigationBarInOut where Self: UIViewController {
    func navigationBarFadeIn() {
        UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: [], animations: {
            self.navigationView.alpha = 0
        }, completion: nil)
    }
    
    func navigationBarFadeOut() {
        UIView.animate(withDuration: 0.5, animations: {
            self.navigationView.alpha = 1
        }, completion: nil)
    }
    
    func navigationBarFadeOutWithPercentage(_ percentage: CGFloat) {
        self.navigationView.alpha = 1 * percentage
    }
}