swift微博第9天(自定义微博首页的菜单)

import UIKit
class PopoverPresentationController: UIPresentationController{
// 定义一个presentFrame 来动态改变展示视图的frame
var presentFrame = CGRect.zero
/**
 实例化负责转场的控制器
 :param: presentedViewController  被展现的控制器
 :param: presentingViewController 发起转场的控制器, xocde6是nil, xocde7是野指针
 :returns: 负责转场的控制器
 */
override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
    super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
}
/*
 即将布局容器视图上得子视图时调用
 containerView 容器视图, 放置展现出来的视图
 presentedView 被展现的视图
 */
override func containerViewWillLayoutSubviews() {
    // 1.添加遮盖
    containerView?.addSubview(coverView)
    containerView?.insertSubview(coverView, at: 0)
    coverView.frame = (containerView?.frame)!
    // 把菜单的frame做活
    if presentFrame == CGRect.zero {
        /*
         *  这个是默认菜单高度
         */
        // 2.调整被展示视图的大小
        presentedView?.frame = CGRect(x:JKscreenW/2.0-100,y:56,width:200,height:200)
        // 2.1.被展示视图上面的子视图大小的调整
        // 背景图片
        presentedView?.subviews[0].frame =  CGRect(x:0,y:0,width:200,height:200)
        // tableview
        presentedView?.subviews[1].frame = CGRect(x:20,y:20,width:presentedView!.width-40,height:presentedView!.height-40)
    }else{
        /*
         *  这个是外面自定义的菜单高度
         */
        // 2.调整被展示视图的大小
        presentedView?.frame = presentFrame
        // 2.1.被展示视图上面的子视图大小的调整
        // 背景图片
        presentedView?.subviews[0].frame =  CGRect(x:0,y:0,width:presentFrame.width,height:presentFrame.height)
        // tableview
        presentedView?.subviews[1].frame = CGRect(x:20,y:20,width:presentFrame.width-40,height:presentFrame.height-40)
    }
}
/**
 关闭弹窗
 */
func close(){
    presentedViewController.dismiss(animated: true, completion: nil)
}
// MARK: - 懒加载
lazy var coverView: UIView = {
    // 1.创建蒙版
    let view = UIView()
    view.backgroundColor = UIColor(white: 0.0, alpha: 0.2)
    // 2.注册监听
    let tap = UITapGestureRecognizer(target: self, action: #selector(PopoverPresentationController.close))
    view.addGestureRecognizer(tap)
    return view
}()
}

import UIKit
// 定义常量保存通知的名称
   let JKPopoverAnimatorWillshow = "JKPopoverAnimatorWillshow"
   let JKPopoverAnimatorWilldismiss = "JKPopoverAnimatorWilldismiss"
/*
 * 负责转场的类
 */
class PopoverAnimator: NSObject,UIViewControllerTransitioningDelegate,UIViewControllerAnimatedTransitioning{
// 记录当前菜单是否展开
var isPresent: Bool = false
var presentFrame = CGRect.zero
// MARK: 只要实现了一下方法，那么系统自带的默认动画就没有了，所有东西都需要程序员自己来实现
// 实现代理方法，告诉系统谁来负责转场动画
// UIPopoverPresentationController ios8推出专门负责转场动画的
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController?{
    let pc = PopoverPresentationController(presentedViewController: presented, presenting: presenting)
    // 传frame,设置菜单的大小
    pc.presentFrame = presentFrame
    return pc
}
// 告诉系统谁来负责Modal的展现动画
// presented  : 被展现的视图
// presenting : 发起的视图
// returns : 谁来负责
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?{
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: JKPopoverAnimatorWillshow), object: self)
    isPresent = true
    return self
}
// 告诉系统谁来负责modal的消失动画
// dismissed 被关闭的视图
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?{
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: JKPopoverAnimatorWilldismiss), object: self)
    isPresent = false
    return self
}
/*
 * UIViewControllerAnimatedTransitioning 下面的2个方法是这个协议产生的
 * 返回动画时长
 * transitionContext : 上下文里面包含了所有需要的参数
 * returns: 动画时长
 *
 */
public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return 0.5
}
/*
 * 告诉系统如何动画，无论是展现还是
 *
 *
 */
public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    // 1.拿到展现的视图
    // let toVc = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
    // let fromVc = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from)
    // 通过打印发现需要修改的是 toVc上面的view
    print(isPresent)
    if isPresent {
        let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)
        // 注意: 一定要把视图添加到view上
        transitionContext.containerView.addSubview(toView!)
        // 把 transform设置为 x:1.0,y: 0
        toView?.transform = CGAffineTransform(scaleX: 1.0, y: 0)
        // 设置锚点
        toView?.layer.anchorPoint = CGPoint(x:0.5, y: 0)
        //print(toView!.layer.anchorPoint)
        // 2.执行动画
        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            // 2.1.清空transform
            toView?.transform = CGAffineTransform.identity
        }) { (_) in
            // 2.2.动画执行完毕，一定要告诉系统,如果不写可能产生一些未知的错误
            transitionContext.completeTransition(true)
        }
    }else{
        let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)
        // 2.执行动画
        UIView.animate(withDuration: transitionDuration(using: transitionContext)-3, animations: {
            // 把 transform设置为 x:1.0,y: 0,由于CGFloat是不准确的，所以写0.0是没有动画的
            fromView?.transform = CGAffineTransform(scaleX: 1.0, y: 0.000001)
        }) { (_) in
            // 2.2.动画执行完毕，一定要告诉系统,如果不写可能产生一些未知的错误
            transitionContext.completeTransition(true)
        }
    }
  }
}

transitionContext.completeTransition(true)

// 1.创建控制器对象
    let popoverViewController = PopoverViewController()
    // 2.设置转场代理, 告诉系统谁来负责转场 popoverAnimator: 是负责转场的
    popoverViewController.transitioningDelegate = popoverAnimator
    // 3.设置转场模式
    popoverViewController.modalPresentationStyle = UIModalPresentationStyle.custom
    present(popoverViewController, animated: true, completion: nil)