首先，我们在Main.storyboard中创建UINavgationController：
在Main.storyboard中创建导航控制器.png
创建MainViewController并与之关联，因为主要是实现侧滑效果，所以就不在MainViewController中搭界面了。
接下来我们在Main.storyboard中再拖一个UIViewController，并创建一个MenuViewController与之关联。然后在界面上搭建你自己喜欢的界面，我是这样搭建的：
MenuViewController.png
下面我们来上代码咯：
在ViewController中：
class ViewController: UIViewController {
// 主页导航控制器
var mainNavigationController:UINavigationController!
// 主页面控制器
var mainViewController:MainViewController!
// 菜单页控制器
var menuViewController:MenuViewController?
// 菜单页当前状态
var currentState = MenuState.Collapsed {
didSet {
//菜单展开的时候，给主页面边缘添加阴影
let shouldShowShadow = currentState != .Collapsed
showShadowForMainViewController(shouldShowShadow: shouldShowShadow)
}
}
// 菜单打开后主页在屏幕右侧露出部分的宽度
let menuViewExpandedOffset: CGFloat = 60
// 侧滑菜单黑色半透明遮罩层
var blackCover: UIView?
// 最小缩放比例
let minProportion: CGFloat = 0.77
//MARK: - life cycle
override func viewDidLoad() {
super.viewDidLoad()
//状态栏文字改成白色
UIApplication.shared.statusBarStyle = .lightContent;
// 给根容器设置背景
let imageView = UIImageView(image: UIImage(named: "back"))
imageView.frame = UIScreen.main.bounds
self.view.addSubview(imageView)
//初始化主视图
mainNavigationController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "mainNavigaiton") as! UINavigationController
view.addSubview(mainNavigationController.view)
//指定Navigation Bar左侧按钮的事件
mainViewController = mainNavigationController.viewControllers.first as! MainViewController
mainViewController.navigationItem.leftBarButtonItem?.action = #selector(ViewController.showMenu)
//添加拖动手势
let panGestureRecognizer = UIPanGestureRecognizer.init(target:self, action:#selector(handlePanGesture(recognizer:)))
mainNavigationController.view.addGestureRecognizer(panGestureRecognizer)
//单击收起菜单手势
let tapGestureRecognizer = UITapGestureRecognizer.init(target: self, action: #selector(ViewController.handlePanGesture as (ViewController) -> () -> ()))
mainNavigationController.view.addGestureRecognizer(tapGestureRecognizer)
}
//MARK: - event response
//导航栏左侧按钮事件响应
func showMenu() {
//如果菜单是展开的则会收起，否则就展开
if currentState == .Expanded {
animateMainView(shouldExpand: false)
}else {
addMenuViewController()
animateMainView(shouldExpand: true)
}
}
//拖动手势响应
func handlePanGesture(recognizer: UIPanGestureRecognizer) {
switch(recognizer.state) {
// 刚刚开始滑动
case .began:
// 判断拖动方向
let dragFromLeftToRight = (recognizer.velocity(in: view).x > 0)
// 如果刚刚开始滑动的时候还处于主页面，从左向右滑动加入侧面菜单
if (currentState == .Collapsed && dragFromLeftToRight) {
currentState = .Expanding
addMenuViewController()
}
// 如果是正在滑动，则偏移主视图的坐标实现跟随手指位置移动
case .changed:
let screenWidth = view.bounds.size.width
var centerX = recognizer.view!.center.x + recognizer.translation(in: view).x
//页面滑到最左侧的话就不许要继续往左移动
if centerX < screenWidth/2 { centerX = screenWidth/2 }
// 计算缩放比例
var proportion:CGFloat = (centerX - screenWidth/2) / (view.bounds.size.width - menuViewExpandedOffset)
proportion = 1 - (1 - minProportion) * proportion
// 执行视差特效
blackCover?.alpha = (proportion - minProportion) / (1 - minProportion)
//主页面滑到最左侧的话就不许要继续往左移动
recognizer.view!.center.x = centerX
recognizer.setTranslation(CGPoint.zero, in: view)
//缩放主页面
recognizer.view?.transform = CGAffineTransform.identity.scaledBy(x: proportion, y: proportion)
// 如果滑动结束
case .ended:
//根据页面滑动是否过半，判断后面是自动展开还是收缩
let hasMovedhanHalfway = recognizer.view!.center.x > view.bounds.size.width
animateMainView(shouldExpand: hasMovedhanHalfway)
default:
break
}
}
//单击手势响应
func handlePanGesture() {
//如果菜单是展开的点击主页部分则会收起
if currentState == .Expanded {
animateMainView(shouldExpand: false)
}
}
//MARK: - private methods
// 添加菜单页
func addMenuViewController() {
if (menuViewController == nil) {
menuViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "menuView") as? MenuViewController
// 插入当前视图并置顶
view.insertSubview(menuViewController!.view, belowSubview: mainNavigationController.view)
// 建立父子关系
addChildViewController(menuViewController!)
menuViewController!.didMove(toParentViewController: self)
// 在侧滑菜单之上增加黑色遮罩层，目的是实现视差特效
blackCover = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height))
blackCover!.backgroundColor = UIColor.black
self.view.insertSubview(blackCover!, belowSubview: mainNavigationController.view)
}
}
//主页自动展开、收起动画
func animateMainView(shouldExpand: Bool) {
// 如果是用来展开
if (shouldExpand) {
// 更新当前状态
currentState = .Expanded
// 动画
let mainPosition = view.bounds.size.width * (1+minProportion/2) - menuViewExpandedOffset doTheAnimate(mainPosition: mainPosition, mainProportion: minProportion, blackCoverAlpha: 0)
}
else { // 如果是用于隐藏
// 动画
doTheAnimate(mainPosition: view.bounds.size.width/2, mainProportion: 1, blackCoverAlpha: 1) {
finished in
// 动画结束之后更新状态
self.currentState = .Collapsed
// 移除左侧视图
self.menuViewController?.view.removeFromSuperview()
// 释放内存
self.menuViewController = nil;
// 移除黑色遮罩层
self.blackCover?.removeFromSuperview()
// 释放内存
self.blackCover = nil;
}
}
}
//主页移动动画、黑色遮罩层动画
func doTheAnimate(mainPosition: CGFloat, mainProportion: CGFloat, blackCoverAlpha: CGFloat, completion: ((Bool) -> Void)! = nil) {
//usingSpringWithDamping：1.0表示没有弹簧震动动画
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1.0,
initialSpringVelocity: 0, options: .curveEaseInOut, animations: {
self.mainNavigationController.view.center.x = mainPosition
self.blackCover?.alpha = blackCoverAlpha
// 缩放主页面
self.mainNavigationController.view.transform = CGAffineTransform.identity.scaledBy(x: mainProportion, y: mainProportion)
}, completion: completion)
}
//给主页面边缘添加、取消阴影
func showShadowForMainViewController(shouldShowShadow: Bool) {
if (shouldShowShadow) {
//需要遮挡不投明度为0.8
mainNavigationController.view.layer.shadowOpacity = 0.8
} else {
mainNavigationController.view.layer.shadowOpacity = 0.0
}
}
}
// 菜单状态枚举
enum MenuState {
case Collapsed // 未显示(收起)
case Expanding // 展开中
case Expanded // 展开
}
在MenuViewController中：
class MenuViewController: UIViewController , UITableViewDelegate, UITableViewDataSource{
let titlesDictionary = ["开通会员", "QQ钱包", "网上营业厅", "个性装扮", "我的收藏", "我的相册"]
@IBOutlet weak var settingTableView: UITableView!
//MARK: - life cycle
override func viewDidLoad() {
super.viewDidLoad()
settingTableView.delegate = self
settingTableView.dataSource = self
settingTableView.tableFooterView = UIView()
}
//MARK: - TableViewDelegate
// 处理点击事件
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print(titlesDictionary[indexPath.row])
tableView.deselectRow(at: indexPath, animated: false)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return titlesDictionary.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "menuViewCell", for: indexPath)
cell.backgroundColor = UIColor.clear
cell.textLabel!.text = titlesDictionary[indexPath.row]
return cell
}
}
最终点击menu，实现如下效果：
最终实现效果.png
好啦，侧滑效果实现啦~~~