仿QQ左侧抽屉 Swift编写

////  RootViewController.swift//  抽屉_Swift////  Created by zhangqiang on 15/7/30.//  Copyright (c) 2015年 zhangqiang. All rights reserved.//import UIKitlet kScreenSize         =            UIScreen.mainScreen().bounds.sizelet kScreenWidth        =            UIScreen.mainScreen().bounds.size.widthlet kScreenHeight       =            UIScreen.mainScreen().bounds.size.heightlet kMainScale:CGFloat  =            0.8let kRightContentWidth:CGFloat =     100let kLeftWidth:CGFloat  =            200class RootViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {    var backImage:UIImageView!    var tableView:UITableView?                          //左侧视图    var backView:UIView?                                //蒙板    var currentTranslateX:CGFloat?    var contentView:UIView?                             //当前显示的视图        var currentViewController:UIViewController = UIViewController(){//当前显示的控制器        willSet(newCurrentViewController){            self.currentViewController.view.removeFromSuperview()        }        didSet(currentViewController){            //不能每次都添加手势，后面得改，可以创建一个UIView(rootView)作为替换，更换控制器后就将视图加到rootView上            self.contentView!.addSubview(self.currentViewController.view)        }    }        var viewControllers:Array<UIViewController> = []{   //子控制器        //属性监听，相当于OC中的setter方法        willSet(newViewControllers){                    }        didSet(newViewControllers){            for viewController:UIViewController in newViewControllers {                self.addChildViewController(viewController)            }        }    }        func closeLeftView(){        //关闭左侧视图        UIView.transitionWithView(self.contentView!, duration: 0.15, options: UIViewAnimationOptions.BeginFromCurrentState, animations: { () -> Void in                        self.contentView!.transform = CGAffineTransformMakeTranslation(0, 0)            self.updateFrameWithTransX(0, maxTrans: kScreenWidth - 100 / kMainScale)                        }, completion: nil)            }    override func viewDidLoad() {        super.viewDidLoad()                self.addViews()        self.currentViewController = self.viewControllers[0]            }        func addViews(){                backImage = UIImageView(frame: self.view.bounds)        backImage.image = UIImage(named: "backImage")        backImage.userInteractionEnabled = true        self.view.addSubview(backImage)                createLeftView()                self.backView = UIView(frame: self.view.bounds)        self.backView!.backgroundColor = UIColor.blackColor()        self.view.addSubview(self.backView!)                let pan:UIPanGestureRecognizer = UIPanGestureRecognizer(target: self, action: "showLeftView:")        self.contentView = UIView(frame: self.view.bounds)        self.contentView!.addGestureRecognizer(pan)        self.view.addSubview(self.contentView!)            }        // MARK: 私有方法    func createLeftView(){        var leftView = UIView(frame: CGRectMake(0, 0, kScreenWidth - kRightContentWidth, kScreenHeight))                var headerView = UIView(frame: CGRectMake(0, 20, self.view.bounds.size.width, 150))        headerView.backgroundColor = UIColor.clearColor()        headerView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "tapActon"))                self.tableView = UITableView(frame: CGRectMake(0, CGRectGetMaxY(headerView.frame), self.view.bounds.size.width, self.view.bounds.size.height - 100 - CGRectGetMaxY(headerView.frame)), style: UITableViewStyle.Plain)        self.tableView!.delegate = self        self.tableView!.dataSource = self        self.tableView!.backgroundColor = UIColor.clearColor()        self.tableView!.separatorStyle = UITableViewCellSeparatorStyle.None                self.view.addSubview(leftView)        self.view.addSubview(headerView)        self.view.addSubview(self.tableView!)    }        func showLeftView(sender:UIPanGestureRecognizer){                if sender.state == UIGestureRecognizerState.Began {            currentTranslateX = self.contentView!.transform.tx             println(currentTranslateX)        }                if sender.state == UIGestureRecognizerState.Changed {            var point:CGPoint = sender.translationInView(self.contentView!)            var transX:CGFloat = point.x + currentTranslateX!                       if transX > 0 {            //根据视图的位置计算缩放比例                var scale:CGFloat = 1 - transX * (1 - kMainScale) / (kScreenWidth - kRightContentWidth / kMainScale)                sender.view!.transform = CGAffineTransformMake(scale, 0, 0, scale, transX, 0)//                self.leftVC!.updateFrameWithTransX(transX,kScreenWidth - 100 / kMainScale)                self.updateFrameWithTransX(transX, maxTrans: kScreenWidth - 100 / kMainScale)                //设置不超过临界点 视图左边离屏幕边界为100（最终偏移量为kScreenWidth - 100 / kMainScale）                if transX >= kScreenWidth - 100 / kMainScale{                    sender.view!.transform = CGAffineTransformMake(kMainScale, 0, 0, kMainScale, kScreenWidth - kRightContentWidth / kMainScale, 0)                }            }else{                sender.view!.transform = CGAffineTransformMakeTranslation(0, 0)            }        }        if sender.state == UIGestureRecognizerState.Ended {            if sender.view!.frame.origin.x >= kScreenWidth * 0.3 {                UIView.transitionWithView(sender.view!, duration: 0.15, options: UIViewAnimationOptions.BeginFromCurrentState, animations: { () -> Void in                    sender.view!.transform = CGAffineTransformMake(kMainScale, 0, 0, kMainScale, kScreenWidth - kRightContentWidth / kMainScale, 0)                    self.updateFrameWithTransX(kScreenWidth - 100 / kMainScale, maxTrans: kScreenWidth - 100 / kMainScale)                }, completion: { (Bool) -> Void in                                    })            }else{                UIView.transitionWithView(sender.view!, duration: 0.15, options: UIViewAnimationOptions.BeginFromCurrentState, animations: { () -> Void in                    sender.view!.transform = CGAffineTransformMakeTranslation(0, 0)                    }, completion: nil)            }        }    }        func updateFrameWithTransX(transX:CGFloat,maxTrans:CGFloat){        //根据主视图的偏移量和最大偏移量计算左侧视图的缩放比例        var scale:CGFloat = (1-kMainScale) * transX / maxTrans + kMainScale        //kLeftWidth为超出左侧屏幕的宽度        var transX1:CGFloat =  -(kScreenWidth / 2 + kLeftWidth) * scale + kScreenWidth / 2 + kLeftWidth        //计算透明度        var backAlpha:CGFloat = -(1 / (1 - kMainScale)) * scale + (1 / (1 - kMainScale))        println(transX1)        if(scale <= 1){            self.tableView!.transform = CGAffineTransformMake(scale, 0, 0, scale, -transX1, 0);            self.backView!.alpha = backAlpha        }    }        // MARK: UITableViewDataSource    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{        return 10    }        func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{        let identifier:String = "Mycell"        var cell:UITableViewCell? = tableView.dequeueReusableCellWithIdentifier(identifier) as? UITableViewCell        if (cell == nil) {            cell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: identifier)            cell!.backgroundColor = UIColor.clearColor()        }        cell!.textLabel?.text = "测试"        cell!.textLabel?.textColor = UIColor.whiteColor()        cell!.selectionStyle = UITableViewCellSelectionStyle.None        return cell!    }        func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {                self.currentViewController = self.viewControllers[indexPath.row]        self.closeLeftView()            }        func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {        return 60    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}