1. 設(shè)置控制器屬性

        // 設(shè)置modal樣式，彈出后原來的view不會(huì)消失，默認(rèn)modal出來的控制器view會(huì)將原來的view移除
        popoverVc.modalPresentationStyle = .custom
        // 設(shè)置轉(zhuǎn)場代理
        popoverVc.transitioningDelegate = self

2. 設(shè)置轉(zhuǎn)場代理方法

// MARK:- transitioningDelegate代理
extension GGHomeViewController : UIViewControllerTransitioningDelegate {
    /// 目的：改變彈出view的frame憋槐，需要自定義UIPresentationController
    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        return GGPresentationController(presentedViewController: presented, presenting: presenting)
    }
    
    /// 目的：設(shè)置彈出動(dòng)畫
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        isPresented = true // 由于彈出和消失用的是同一個(gè)協(xié)議婆殿，所需需要設(shè)置一個(gè)標(biāo)志位來區(qū)分是彈出還是消失
        return self
    }
    /// 目的：設(shè)置消失動(dòng)畫
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        isPresented = false
        return self
    }
}

2.1 自定義UIPresentationController

class GGPresentationController: UIPresentationController {
    
    // MARK:- 懶加載屬性
    fileprivate lazy var coverView : UIView = UIView()
    
    // MARK:- 系統(tǒng)函數(shù)回調(diào)
    override func containerViewWillLayoutSubviews() {
        super.containerViewWillLayoutSubviews()
        
        // 設(shè)置frame
        presentedView?.frame = CGRect(x: 100, y: 55, width: 180, height: 250)
        
        setupCoverView()
    }
}

// MARK:- 設(shè)置蒙版
extension GGPresentationController {
    fileprivate func setupCoverView() {
        // 1. 添加蒙版
        containerView?.insertSubview(coverView, at: 0)
        
        // 2. 設(shè)置屬性
        coverView.frame = containerView!.bounds
        coverView.backgroundColor = UIColor(white: 0.6, alpha: 0.2)
        
        // 3. 給蒙版添加手勢事件
        let tabGes = UITapGestureRecognizer(target: self, action: #selector(GGPresentationController.coverViewTapGesClk))
        coverView.addGestureRecognizer(tabGes)
    }
}

// MARK:- 手勢點(diǎn)擊處理
extension GGPresentationController {
    @objc fileprivate func coverViewTapGesClk() {
        print("coverViewTapGesClk")
        presentedViewController.dismiss(animated: true, completion: nil)
    }
}

3. 設(shè)置彈出载矿、消失動(dòng)畫的協(xié)議

// MARK:- UIViewControllerAnimatedTransitioning協(xié)議
extension GGHomeViewController : UIViewControllerAnimatedTransitioning {
    /// 設(shè)置動(dòng)畫播放事件
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.5
    }
    
    /// 設(shè)置動(dòng)畫效果
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        isPresented ? animationToPresentedView(using: transitionContext) : animationToDismissedView(using: transitionContext)
    }
    
    // 彈出動(dòng)畫
    fileprivate func animationToPresentedView(using transitionContext: UIViewControllerContextTransitioning) {
        // 1. 獲取彈出的view
        let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.to)!
        
        // 2. 添加view
        transitionContext.containerView.addSubview(presentedView)
        
        // 3. 設(shè)置動(dòng)畫
        presentedView.transform = CGAffineTransform(scaleX: 1.0, y: 0.0)
        presentedView.layer.anchorPoint = CGPoint(x: 0.5, y: 0) // 動(dòng)畫的開始位置
        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            presentedView.transform = CGAffineTransform.identity
        }) { (_) in
            // 4. 完成動(dòng)畫
            transitionContext.completeTransition(true)
        }
    }
    
    // 消失動(dòng)畫
    // 返回的對(duì)象是一個(gè)協(xié)議板辽，直接設(shè)置成當(dāng)前對(duì)象
    fileprivate func animationToDismissedView(using transitionContext: UIViewControllerContextTransitioning) {
        // 1. 獲取彈出的view
        let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.from)!
        
        // 2. 設(shè)置動(dòng)畫
        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            presentedView.transform = CGAffineTransform(scaleX: 1.0, y: 0.001)
        }) { (_) in
            // 3. 完成動(dòng)畫
            transitionContext.completeTransition(true)
        }
    }
}