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Swift封装-滑出式导航栏

2018-11-07 17:49 编辑: 游星啊 分类:iOS开发 来源:Dwyane_Coding

11.gif

前言:

本文将会创建以下几个主类:

  • DWContainerViewController:这包含了左视图,中视图和右视图控制器的视图,并处理动画和滑动等操作。

  • DWCenterViewController:中央面板。

  • DWSidePanelViewController:用于左侧和右侧面板。

创建storyboard,如图:

12.png

并且创建DWCenterViewController、DWStarCell、DWSidePanelViewController,关联上图中的storyboard

DWCenterViewController为滑出式导航的类,代码:

class DWCenterViewControllerUIViewController {

    var delegate: DWCenterViewControllerDelegate?

    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var creatorLabel: UILabel!

    @IBAction func actorsTapped(_ sender: Any) {
        //左边点击事件   
    }
}


DWStarCell代码:

class DWStarCellUITableViewCell {

    @IBOutlet weak var animalImageView: UIView!
    @IBOutlet weak var imageNameLabel: UILabel!
    @IBOutlet weak var imageCreatorLabel: UILabel!

}


创建DWStar.swift模型,并且初始化cell显示的数据,代码如下:

//结构体
struct DWStar {
    let title: String
    let creator: String
    let image: UIImage?
   //重写init方法
    init(title: String, creator: String, image:UIImage?) {
        self.title = title
        self.creator = creator
        self.image = image
    }

    static func allActors() -> [DWStar] {
        return [
            DWStar(title: "林志玲", creator: "Dwyane", image: UIImage(named: "ID-100113060")),
            DWStar(title: "张歆艺", creator: "Dwyane", image: UIImage(named: "ID-10022760")),
            DWStar(title: "李连杰", creator: "Dwyane", image: UIImage(named: "ID-10091065")),
            DWStar(title: "周润发", creator: "Dwyane", image: UIImage(named: "ID-10047796")),
            DWStar(title: "舒淇", creator: "Dwyane", image: UIImage(named: "ID-10092572")),
            DWStar(title: "鹿晗", creator: "Dwyane", image: UIImage(named: "ID-10041194")),
            DWStar(title: "黄晓明", creator: "Dwyane", image: UIImage(named: "ID-10017782")),
            DWStar(title: "李赛凤", creator: "Dwyane", image: UIImage(named: "ID-10091745")),
            DWStar(title: "赵丽颖", creator: "Dwyane Ratcliff", image: UIImage(named: "ID-10056941")),
            DWStar(title: "周星驰", creator: "Dwyane", image: UIImage(named: "ID-10019208")),
            DWStar(title: "杜海涛", creator: "Dwyane", image: UIImage(named: "ID-10011404"))
        ]
    }

   

创建DWCenterViewControllerDelegate,并且创建协议方法:

//创建协议 optional:类似oc的可选
@objc
protocol DWCenterViewControllerDelegate {
    @objc optional func toggleLeftPanel()  //切换左边的容器
    @objc optional func collapseSidePanels() //折叠侧边的容器
}


在DWCenterViewController.swift的actorsTapped点击方法调用协议方法toggleLeftPanel,如下:

@IBAction func actorsTapped(_ sender: Any) {
    //左边点击事件
    delegate?.toggleLeftPanel?()
}


创建DWSidePanelViewControllerDelegate.swift,并创一个协议

protocol DWSidePanelViewControllerDelegate {
    func didSelectAnimal(_ animal: DWStar)  //选择的动物
}


在DWCenterViewController.swift实现DWSidePanelViewControllerDelegate的协议方法:

// MARK: - DWCenterViewController delegate
//在该类实现delegate的方法
extension DWCenterViewController: DWSidePanelViewControllerDelegate {
    func didSelectAnimal(_ animal: DWStar) { //实现协议方法
        imageView.image = animal.image
        titleLabel.text = animal.title
        creatorLabel.text = animal.creator

        delegate?.collapseSidePanels?() //折叠侧容器
    }  
}


创建DWContainerViewController.swift,并定义一些属性:

//枚举  滑动状态
enum SlideOutState {
    case bothCollapsed  //侧容器折叠
    case leftPanelExpanded   //左容器展开
    case rightPanelExpanded  //右容器展开
}

//定义属性
var centerNavigationController: UINavigationController!
var centerViewController: DWCenterViewController!
//当前状态
var currentState: SlideOutState = .bothCollapsed {
    didSet { //在属性值改变后触发didSet
        let shoulShowShadow = currentState != .bothCollapsed
    }
}

var leftViewController: DWSidePanelViewController?
var centerPanelExpandedOffset: CGFloat = 60 //该值是中央视图控制器在屏幕外动画显示后左侧可见的宽度(以点为单位)


扩展UIStoryboard,方便取得VC,代码如下:

private extension UIStoryboard {
    static func mainStoryboard() -> UIStoryboard {
        return UIStoryboard(name: "Main", bundle: Bundle.main)
    }

    static func centerViewController() -> DWCenterViewController? {
        return mainStoryboard().instantiateViewController(withIdentifier: "DWCenterViewController"as? DWCenterViewController
    }

    static func leftViewController() -> DWSidePanelViewController? {
        return mainStoryboard().instantiateViewController(withIdentifier: "LeftViewController"as? DWSidePanelViewController
    }    
}


在viewDidLoad添加如下:

//添加中间控制器并显示
centerViewController = UIStoryboard.centerViewController()
centerViewController.delegate = self

//将centerViewController包装在导航控制器中
centerNavigationController = UINavigationController(rootViewController: centerViewController)
//加入centerViewcontroller的视图
view.addSubview(centerNavigationController.view)
//加入centerViewcontroller的视图控制器
addChildViewController(centerNavigationController)
centerNavigationController.didMove(toParentViewController: self)


实现协议方法(添加左侧容器一起动画的发生代码):

extension DWContainerViewControllerDWCenterViewControllerDelegate { 
}


在协议方法中,添加

func toggleLeftPanel() {
    //如果当前状态:左边为展开
    let notAlreadyExpanded = (currentState != .leftPanelExpanded)

    if notAlreadyExpanded {
        addLeftPanelViewController() //添加左边容器
    }
    //左边容器展开的动画
    animateLeftPanel(shouldExpand: notAlreadyExpanded)
}

//折叠侧边容器
func collapseSidePanels() {
    switch currentState {
    case .leftPanelExpanded:
        toggleLeftPanel()
    default:
        break
    }
}

//左边的VC
func addLeftPanelViewController() {//guard语句判断其后的表达式布尔值为false时,才会执行之后代码块里的代码,如果为true,则跳过整个guard语句
    guard leftViewController == nil else { return }

    if let vc = UIStoryboard.leftViewController() {
        vc.animals = DWStar.allActors()
        addChildSidePanelController(vc)
        leftViewController = vc
    }
}

func addChildSidePanelController(_ sidePanelController: DWSidePanelViewController) {
    sidePanelController.delegate = centerViewController
    view.insertSubview(sidePanelController.view, at: 0)

    addChildViewController(sidePanelController)
    sidePanelController.didMove(toParentViewController: self)
}


//右边的VC
func addRightPanelViewController() {

}

func animateLeftPanel(shouldExpand: Bool) {
    if shouldExpand {
        currentState = .leftPanelExpanded
        animateCenterPanelXPosition(targetPosition: centerNavigationController.view.frame.width - centerPanelExpandedOffset)
    } else {
        animateCenterPanelXPosition(targetPosition: 0, completion: { (_) in
            self.currentState = .bothCollapsed
            self.leftViewController?.view.removeFromSuperview()
            self.leftViewController = nil
        })
    }
}

//检查是否被告知展开或折叠侧面板。如果它应该展开,那么它将设置当前状态以指示左侧面板展开,然后为中央面板设置动画,以便打开。否则,它将关闭中央面板,然后移除其视图,并设置当前状态以指示其关闭。
func animateCenterPanelXPosition(targetPosition: CGFloat, completion: ((Bool) -> Void)? = nil) {
    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0, options: .curveEaseOut, animations: {
        self.centerNavigationController.view.frame.origin.x = targetPosition
    }, completion: completion)
}



func showShadowForCenterViewController(_ shouldShowShadow: Bool) {
    if shouldShowShadow {
        centerNavigationController.view.layer.shadowOpacity = 0.8
    } else {
        centerNavigationController.view.layer.shadowOpacity = 0.0
    }
}

}


添加手势,更改DWCenterViewController的导航栏x坐标

// 手势
// MARK: Gesture recognizer
extension DWContainerViewController: UIGestureRecognizerDelegate {
    @objc func handlePanGesture(_ recognize: UIPanGestureRecognizer{
        let gestureIsDraggingFromLeftToRight = (recognize.velocity(in: view).x > 0)

        switch recognize.state {
        case .began:
            if currentState == .bothCollapsed {
                if gestureIsDraggingFromLeftToRight {
                    //左边
                    addLeftPanelViewController()
                } else {
                    //右边
                    addRightPanelViewController()
                }
                showShadowForCenterViewController(true)
            }
        case .changed:
            if let rview = recognize.view {
                rview.center.x = rview.center.x + recognize.translation(in: view).x
                recognize.setTranslation(CGPoint.zero, in: view)
                //translationInView:方法获取View的偏移量  setTranslation:方法设置手势的偏移量
            }
        case .ended: //根据不同的方向移动左或右
            if let _ = leftViewController,
                let rview = recognize.view {
                let hasMovedGreaterThanHalfway = rview.center.x > view.bounds.size.width
                animateLeftPanel(shouldExpand: hasMovedGreaterThanHalfway)
            }

        default:
            break
        }

    }
}


代码传送门

注意:

  1. 自己添加tableView,需要手动添加dataSource 和 delegate

  2. 调节tableView的row height

作者:Dwyane_Coding

链接:https://www.jianshu.com/p/52142916a23d

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