实习笔记：侧滑菜单的小轮子-纯粹的侧滑菜单slidebar-摩拜单车类似

直接上代码吧。
注释很清楚的了。
希望能与大家互相沟通交流，学习一下。
swift3写的。

//手势等的逻辑处理

import UIKit

let animationTime = 0.4

class AnimateViewController: UIViewController {

var rootViewController: UIViewController
var hasShow = false
var leftVc: UIViewController
var bgView: UIView?

init(rootViewController: UIViewController, contentViewController leftVc: UIViewController) {

    self.rootViewController = rootViewController
    self.leftVc = leftVc
    super.init(nibName: nil, bundle: nil)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

var hideStatusBar = false

// 控制状态栏
override var prefersStatusBarHidden: Bool {
    return false
}

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
}

override var preferredStatusBarUpdateAnimation: UIStatusBarAnimation{
    return .slide
}


override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.clear

    // 半透明的view
    let bgView = UIView()
    bgView.backgroundColor = UIColor.black
    bgView.frame = UIScreen.main.bounds

    //背景图的透明度
    bgView.alpha = 0.1
    self.view.addSubview(bgView)

    //self.bgView = bgView
    // 添加两个手势
    let tapGestureRec = UITapGestureRecognizer(target: self, action: #selector(self.closeSideBar))
    bgView.addGestureRecognizer(tapGestureRec)
    let panGestureRec = UIPanGestureRecognizer(target: self, action: #selector(self.moveViewWithGesture))
    self.view.addGestureRecognizer(panGestureRec)
    self.leftVc.view.backgroundColor = UIColor.red

    //背景图的宽度大小
    var width: CGFloat = UIScreen.main.bounds.size.width - 100
    //背景图推出时的延阻滞留退出画面宽度
    if UIScreen.main.bounds.size.width > 375 {
        width -= 50
    }
    else if UIScreen.main.bounds.size.width > 320 {
        width = width - 0
    }

    self.leftVc.view.frame = CGRect(x: -width, y: 0, width: width, height: UIScreen.main.bounds.size.height)
    self.leftVc.view.backgroundColor = UIColor.groupTableViewBackground
    self.view.addSubview((self.leftVc.view)!)
    self.addChildViewController(self.leftVc)

}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)
    if !self.hasShow {
        self.hasShow = true
        self.hideStatusBar = true
        UIView.animate(withDuration: animationTime, animations: {() -> Void in
            self.setNeedsStatusBarAppearanceUpdate()
            self.rootViewController.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 64)
        })
    }
    self.navigationController?.setNavigationBarHidden(true, animated: true)
    self.showAnimation()
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(true)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(true)
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}

/**
 显示控制器
 */

func showAnimation() {
    self.view.isUserInteractionEnabled = false
    //根据当前x，计算显示时间
    let time: CGFloat = fabs(self.leftVc.view.frame.origin.x / self.leftVc.view.frame.size.width) * CGFloat(animationTime)
    UIView.animate(withDuration: TimeInterval(time), animations: {() -> Void in
        self.leftVc.view.frame = CGRect(x: 0, y: 0, width: self.leftVc.view.frame.size.width, height: UIScreen.main.bounds.size.height)
        self.bgView?.alpha = 0.3
    }, completion: {(finished: Bool) -> Void in
        self.view.isUserInteractionEnabled = true
    })
}

func closeAnimation() {
    self.view.isUserInteractionEnabled = false
    let time: CGFloat = (1 - fabs(self.leftVc.view.frame.origin.x / self.leftVc.view.frame.size.width)) * CGFloat(animationTime)
    UIView.animate(withDuration: TimeInterval(time), animations: {() -> Void in
        var frame = self.leftVc.view.frame
        frame.origin.x = -frame.size.width
        self.leftVc.view.frame = frame
    }, completion: {(finished: Bool) -> Void in
        //状态栏出现
        self.hideStatusBar = false
        if #available(iOS 10.0, *) {
            //高于 iOS 10.0
            UIView.animate(withDuration: animationTime, animations: {() -> Void in
                self.setNeedsStatusBarAppearanceUpdate()
            })
        }
        SliderMenuTool.dismiss()
    })
}

/**
 * 点击手势
 */

func closeSideBar() {
    self.closeAnimation()
}
/**
 * 拖拽手势
 */

func moveViewWithGesture(panGes: UIPanGestureRecognizer) {
    // 下面是计算
    // 开始位置
    var startX: CGFloat
    // 结束位置
    var lastX: CGFloat = 350
    // 改变多少
    var durationX: CGFloat
    let touchPoint = panGes.location(in: UIApplication.shared.keyWindow)
    // 手势开始
    if panGes.state == .began {
        startX = touchPoint.x
        lastX = touchPoint.x
    }
    // 手势改变
    if panGes.state == .changed {
        let currentX: CGFloat = touchPoint.x
        durationX = currentX - lastX
        lastX = currentX
        var leftVcX: CGFloat = durationX + self.leftVc.view.frame.origin.x
        // 如果控制器的x小于宽度直接返回
        if leftVcX <= -self.leftVc.view.frame.size.width {
            leftVcX = -self.leftVc.view.frame.size.width
        }
        // 如果控制器的x大于0直接返回
        if leftVcX >= 0 {
            leftVcX = 0
        }
        // 计算bgView的透明度
        self.bgView?.alpha = (1 + leftVcX / self.leftVc.view.frame.size.width) * 0.5
        // 设置左边控制器的frame
        self.leftVc.view.frame = CGRect(x:leftVcX, y: 0, width: self.leftVc.view.frame.size.width, height: self.leftVc.view.frame.size.height)
        //        NSLog(@"%f", self.leftVc.view.frame.origin.x);
    }
    // 手势结束
    if panGes.state == .ended {
        // 结束为止超时屏幕一半
        if self.leftVc.view.frame.origin.x > -self.leftVc.view.frame.size.width + UIScreen.main.bounds.size.width / 2 {
            self.showAnimation()
        }
        else {
            self.closeAnimation()
        }
    }
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}