自定义TabBar各个Item

制作如图的弹出菜单

首先将导航条的titleView换成一个UIButton

func configNavigationBar() {

    navigationTitleBtn.setImage(UIImage.init(named: "navigationbar_arrow_down"), for: .normal)
    navigationTitleBtn.setImage(UIImage.init(named: "navigationbar_arrow_up"), for: .selected)
    navigationTitleBtn.setTitle("title", for: .normal)
    navigationTitleBtn.setTitleColor(UIColor.black, for: .normal)
    navigationTitleBtn.sizeToFit()
    navigationItem.titleView = navigationTitleBtn
    navigationTitleBtn.addTarget(self, action: #selector(navigationTitleClick), for: .touchUpInside)
}

func navigationTitleClick() {

    let popoverVC : ZFPopMenuController = ZFPopMenuController()

    popoverVC.modalPresentationStyle = .custom

    popoverVC.transitioningDelegate = popOver

    navigationTitleBtn.isSelected = popOver.isPresentedView

    self.present(popoverVC, animated: true, completion: nil)
}

自定义弹出的控制器，并自定义控制器的尺寸

import UIKit

class ZFPresentationController: UIPresentationController {

    lazy var coverView:UIView = UIView()

    override func containerViewWillLayoutSubviews() {
        super.containerViewWillLayoutSubviews()

        let viewW:CGFloat = 180.0
        presentedView?.frame = CGRect(x: (UIScreen.main.bounds.size.width - viewW) * 0.5, y: 55, width: viewW, height: 250)

        configCover()
    }

    func configCover() {
        containerView?.insertSubview(coverView, at: (containerView?.subviews.count)! - 1)

        coverView.backgroundColor = UIColor(white: 0.8, alpha: 0.2)
        coverView.frame = containerView!.bounds

        let tap = UITapGestureRecognizer(target: self, action: #selector(coverViewClick))
        coverView.addGestureRecognizer(tap)
    }

    func coverViewClick() {
        print("coverViewClick")

        presentedViewController.dismiss(animated: true, completion: nil)
    }
}

在定义一个实现代理的类实现UIViewControllerTransitioningDelegate代理和UIViewControllerAnimatedTransitioning协议的方法，然后重置动画

import UIKit

class ZFPopOver: NSObject {

    var isPresentedView:Bool = true
}

extension ZFPopOver : UIViewControllerTransitioningDelegate
{
    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        //返回自定义的弹出控制器
        return ZFPresentationController(presentedViewController: presented, presenting: presenting)
    }

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        isPresentedView = true

        return self
    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        isPresentedView = false

        return self
    }
}

extension ZFPopOver : UIViewControllerAnimatedTransitioning
{

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {

        return 0.2
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        if isPresentedView == true
        {
            animationForPresented(transitionContext: transitionContext)
        }
        else
        {
            animationForDismiss(transitionContext: transitionContext)
        }
    }

    func animationForPresented(transitionContext: UIViewControllerContextTransitioning){

        //UITransitionContextViewKey.from 获取消失的view
        //UITransitionContextViewKey.to 获取弹出的view
        let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.to)!

        transitionContext.containerView.addSubview(presentedView)
        presentedView.layer.anchorPoint = CGPoint(x:0.5,y:0)
        presentedView.transform = CGAffineTransform(scaleX: 1.0,y: 0.0)
        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            presentedView.transform = CGAffineTransform.identity
        }) { (_) in
            transitionContext.completeTransition(true)
        }
    }

    func animationForDismiss(transitionContext: UIViewControllerContextTransitioning){

        let dissmisView = transitionContext.view(forKey: UITransitionContextViewKey.from)!

        transitionContext.containerView.addSubview(dissmisView)
        dissmisView.layer.anchorPoint = CGPoint(x:0.5,y:0)
        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            dissmisView.transform = CGAffineTransform(scaleX:1.0,y:0.00001)
        }) { (_) in
            transitionContext.completeTransition(true)
        }
    }
}