paiai_ios/PaiAi/PaiaiUIKit/Reusable/UIKit/AlertViewController/AlertViewAnimatable.swift

//
//  AlertAnimator.swift
//  PaiAi
//
//  Created by ffib on 2018/12/17.
//  Copyright © 2018 yb. All rights reserved.
//

import UIKit

protocol AlertViewAnimatable {
    func toViewPresentedAnimation(duration: TimeInterval, in view: UIView)
    func fromViewPresentingAnimation(duration: TimeInterval, in view: UIView)
    
    func contentViewAppearAnimation(duration: TimeInterval, in view: UIView)
    func contentViewDisappearAnimation(duration: TimeInterval, in view: UIView)
}

extension AlertViewAnimatable {
    func toViewPresentedAnimation(duration: TimeInterval, in view: UIView) {
        let animation = CABasicAnimation(keyPath: "backgroundColor")
        animation.duration = duration
        animation.isRemovedOnCompletion = true
        animation.toValue = UIColor(red: 52 / 255,
                                    green: 52 / 255,
                                    blue: 52 / 255,
                                    alpha: 0.7).cgColor
        animation.fromValue = UIColor(red: 52 / 255,
                                      green: 52 / 255,
                                      blue: 52 / 255,
                                      alpha: 0).cgColor
        view.layer.add(animation, forKey: nil)
    }
    
    func fromViewPresentingAnimation(duration: TimeInterval, in view: UIView) {
        let animation = CABasicAnimation(keyPath: "backgroundColor")
        animation.duration = duration
        animation.isRemovedOnCompletion = false
        animation.fillMode = .forwards
        animation.toValue = UIColor(red: 52 / 255,
                                    green: 52 / 255,
                                    blue: 52 / 255,
                                    alpha: 0).cgColor
        animation.fromValue = UIColor(red: 52 / 255,
                                      green: 52 / 255,
                                      blue: 52 / 255,
                                      alpha: 0.7).cgColor
        view.layer.add(animation, forKey: nil)
    }
}