IOS中Swift仿QQ最新版抽屉侧滑和弹框视图

导读

简单用Swift写了一个抽屉效果,可以直接使用并且简单;

很多软件都运了抽屉效果，比如qq的左抽屉，英雄联盟,滴滴打车，和uber等等都运用了抽屉;

效果

iOS抽屉式结构实现分析

主要是在控制器的View上添加了两个View,一个左侧leftView和一个mainView。这里我们自定义一个DrawerViewController，init(mainVC: UIViewController, leftMenuVC: UIViewController, leftWidth: CGFloat)设置，一个mainVC，一个leftMenuVC，和一个宽度,将mainVC和leftMenuVC的view添加到controller的view上（menuVC的view在下面）。

   view.addSubview(leftMenuVC.view)
   view.addSubview(mainVC.view)

   addChildViewController(leftMenuVC)
   addChildViewController(mainVC)

然后首先实现点击方法openLeftMenu和closeLeftMenu（这两个方法主要是计算mainVC的view的位置）方便以后调用。

//MARK: - 打开左侧菜单
  func openLeftMenu() {

    UIView.animate(withDuration: 0.25, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {

      self.leftVC?.view.transform = CGAffineTransform.identity
      self.mainVC?.view.transform = CGAffineTransform(translationX: self.maxWidth, y: 0)

    }, completion: {

      (finish: Bool) -> () in

      self.mainVC?.view.addSubview(self.coverBtn)

    })

  }

  //MARK: - 关闭左侧菜单
  func closeLeftMenu() {

    UIView.animate(withDuration: 0.25, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {

      self.leftVC?.view.transform = CGAffineTransform(translationX: -self.maxWidth, y: 0)
      self.mainVC?.view.transform = CGAffineTransform.identity

    }, completion: {

      (finish: Bool) -> () in

      self.coverBtn.removeFromSuperview()

    })

  }

最后给mainVC的view添加屏幕边缘手势，实现mainVC的view跟随手指移动。循环遍历view给每一个一级视图添加手势

for childViewController in (mainVC?.childViewControllers)! {

     addScreenEdgePanGestureRecognizerToView(view: childViewController.view)

   }

//MARK: - 添加屏幕边缘手势
  private func addScreenEdgePanGestureRecognizerToView(view: UIView) {

    let pan = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(edgPanGesture(_:)))
    pan.edges = UIRectEdge.left
    view.addGestureRecognizer(pan)

  }

在平移手势调用的方法中，通过偏移量来确定mainView的frame，实现动画效果

1. 首先通过pan.translation(in: pan.view).x方法获取偏移量,通过偏移量的正负确定拖动的方向
2. 当手指松开后需要根据mainView的x值确定其视图是定位到原始位置还是其缩放的位置

打开手势

//MARK: - 屏幕左边缘手势
  func edgPanGesture(_ pan: UIScreenEdgePanGestureRecognizer) {

    let offsetX = pan.translation(in: pan.view).x

    if pan.state == UIGestureRecognizerState.changed && offsetX <= maxWidth {

      mainVC?.view.transform = CGAffineTransform(translationX: max(offsetX, 0), y: 0)
      leftVC?.view.transform = CGAffineTransform(translationX: -maxWidth + offsetX, y: 0)

    } else if pan.state == UIGestureRecognizerState.ended || pan.state == UIGestureRecognizerState.cancelled || pan.state == UIGestureRecognizerState.failed {

      if offsetX > screenW * 0.5 {

        openLeftMenu()

      } else {

        closeLeftMenu()
      }

    }

  }

关闭遮盖手势

//MARK: - 遮盖按钮手势
  func panCloseLeftMenu(_ pan: UIPanGestureRecognizer) {

    let offsetX = pan.translation(in: pan.view).x
    if offsetX > 0 {return}

    if pan.state == UIGestureRecognizerState.changed && offsetX >= -maxWidth {

      let distace = maxWidth + offsetX

      mainVC?.view.transform = CGAffineTransform(translationX: distace, y: 0)
      leftVC?.view.transform = CGAffineTransform(translationX: offsetX, y: 0)

    } else if pan.state == UIGestureRecognizerState.ended || pan.state == UIGestureRecognizerState.cancelled || pan.state == UIGestureRecognizerState.failed {

      if offsetX > screenW * 0.5 {

        openLeftMenu()

      } else {

        closeLeftMenu()
      }

    }

  }

UIPresentationController简介

1. UIPresentationController是 iOS8 新增的一个API，苹果的官方定义是：对象为所呈现的视图控制器提供高级视图的转换管理（从呈现视图控制器的时间直到它被消除期间）;
2. iOS 8以前就是自定义view,去画一个三角和长方形;
3. 简单直接的方法用图片

直接贴代码不讲废话

@IBAction func showAlert(_ sender: UIBarButtonItem) {

    let popVC = PopViewController()
    popVC.modalPresentationStyle = UIModalPresentationStyle.popover
    popVC.popoverPresentationController?.barButtonItem = sender
    popVC.popoverPresentationController?.delegate = self
    //可控制三角颜色
    popVC.popoverPresentationController?.backgroundColor = UIColor.white
    present(popVC, animated: true, completion: nil)

  }

  func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
    return UIModalPresentationStyle.none
  }

  func popoverPresentationControllerShouldDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) -> Bool {
    return true
  }

具体代码可以从这里下载：WLDrawerView_jb51.rar

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