创建 viewController, 凭借 json 文件， 任意显示想展示的内容 ，

不需App 升级

自定制 下面 的 tabBar, 隐藏 系统的， 显示 自己制造的 view

应该 用 解耦，

何必 UIButton + UILabel,
UIButton ,很强大，
系统的 UITab

import UIKit

class MainTabBarController: UITabBarController {
    
    
    //tabbar背景视图
    private var bgView: UIView?
    
    
    //json文件对应的数组
    //计算属性
    private var array: Array<Dictionary<String,String>>? {
        
        get {
            //读文件
            let path = NSBundle.mainBundle().pathForResource("Ctrl.json", ofType: nil)
            
            var myArray: Array<Dictionary<String,String>>? = nil
            if let filePath = path {
                
                let data = NSData(contentsOfFile: filePath)
                if let jsonData = data {
                    
                    do {
                    
                        let jsonValue = try NSJSONSerialization.JSONObjectWithData(jsonData, options: .MutableContainers)
                        if jsonValue.isKindOfClass(NSArray.self) {
                            myArray = jsonValue as? Array<Dictionary<String,String>>
                        }
                        
                    }catch {
                        //程序出现异常
                        print(error)
                        return nil
                    }
                    
                    
                }
                
            }
            
            return myArray
        }
    }
 

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        //Swift里面，一般在类的内部调用属性和方法的时候，可以不写self，一般在闭包里面写self
        //创建视图控制器
        createViewControllers()
    }
    
    
    //创建视图控制器
    func createViewControllers(){
        
        //视图控制器名字
        var ctrlNames = [String]()
        //tabbar上面的图片
        var imageNames = [String]()
        //tabbar上面的标题文字
        var titleNames = [String]()
        
        if let tmpArray = self.array {
            //json文件的数据解析成功
            //并且数组里面有数据
            for dict in tmpArray {
                
                let name = dict["ctrlName"]
                let titleName = dict["titleName"]
                let imageName = dict["imageName"]
                
                ctrlNames.append(name!)
                titleNames.append(titleName!)
                imageNames.append(imageName!)
            }
            
            
        }else{
            ctrlNames = ["CookBookViewController", "CommunityViewController","MallViewController","FoodClassViewController","ProfileViewController"]
        
            
            titleNames = ["食材","社区","商城","食课","我的"]
            imageNames = ["home","community","shop","shike","mine"]
        }
        
        
        
        var vCtrlArray = Array<UINavigationController>()
        for i in 0..<ctrlNames.count {
            
            //创建视图控制器
            let ctrlName = "TestKitchen." + ctrlNames[i]
            
            let cls = NSClassFromString(ctrlName) as! UIViewController.Type
            let ctrl = cls.init()
            
            //导航
            let navCtrl = UINavigationController(rootViewController: ctrl)
            vCtrlArray.append(navCtrl)
        }
        
        self.viewControllers = vCtrlArray
        
        
        //隐藏系统的tabbar
        tabBar.hidden = true
        
        //自定制tabbar
        self.createCustomTabbar(titleNames, imageNames: imageNames)
        
    }
    
    
    //自定制tabbar
    /*
     @param titleNames:文字的数组
     @param imageNames:图片的数组
     */
    func createCustomTabbar(titleNames: [String], imageNames: [String]) {
        
        //1.创建背景视图
        bgView = UIView.createView()
        bgView?.backgroundColor = UIColor.whiteColor()
        //设置边框
        bgView?.layer.borderWidth = 1
        bgView?.layer.borderColor = UIColor.grayColor().CGColor
        view.addSubview(bgView!)
        
        //添加约束
        bgView?.snp_makeConstraints(closure: {
            [weak self]
            (make) in
            make.left.right.equalTo(self!.view)
            make.bottom.equalTo(self!.view)
            make.top.equalTo(self!.view.snp_bottom).offset(-49)
        })
        
        
        //2.循环添加按钮
        
        //按钮的宽度
        let width = kScreenWidth/5.0
        
        for i in 0..<imageNames.count {
            
            //图片
            let imageName = imageNames[i]
            let titleName = titleNames[i]
            
            //2.1 按钮
            let bgImageName = imageName+"_normal"
            let selectBgImageName = imageName+"_select"
            let btn = UIButton.createBtn(nil, bgImageName: bgImageName, selectBgImageName: selectBgImageName, target: self, action: #selector(clickBtn(_:)))
            bgView?.addSubview(btn)
            //MARK: - 就是这里
            
            //添加约束
            btn.snp_makeConstraints(closure: {
                [weak self]
                (make) in
                
                make.top.bottom.equalTo(self!.bgView!)
                    make.width.equalTo(width)
                    make.left.equalTo(width*CGFloat(i))
                
            })
            
            //2.2 文字
            let label = UILabel.createLabel(titleName, font: UIFont.systemFontOfSize(8), textAlignment: .Center, textColor: UIColor.grayColor())
            btn.addSubview(label)
            
            //约束
            label.snp_makeConstraints(closure: {
                (make) in
                make.left.right.equalTo(btn)
                make.top.equalTo(btn).offset(32)
                make.height.equalTo(12)
            })
            
            //设置tag值
            btn.tag = 300+i
            label.tag = 400
            
            //默认选中第一个按钮
            if i == 0 {
                btn.selected = true
                label.textColor = UIColor.orangeColor()
            }
            
        }
        
        
    }
    
    
    func clickBtn(curBtn: UIButton) {
        
        //1.取消之前选中按钮的状态
        let lastBtnView = bgView!.viewWithTag(300+selectedIndex)
        if let tmpBtn = lastBtnView {
            //上次选中的按钮
            let lastBtn = tmpBtn as! UIButton
            let lastView = tmpBtn.viewWithTag(400)
            if let tmpLabel = lastView {
                //上次选中的标签
                let lastLabel = tmpLabel as! UILabel
                lastBtn.selected = false
                lastLabel.textColor = UIColor.grayColor()
            }
        }
        
        //2.设置当前选中按钮的状态
        let curLabelView = curBtn.viewWithTag(400)
        if let tmpLabel = curLabelView {
            let curLabel = tmpLabel as! UILabel
            
            curBtn.selected = true
            curLabel.textColor = UIColor.orangeColor()
        }
        
        //3.选中视图控制器
        selectedIndex = curBtn.tag - 300
        
    }
    
    //MARK: -  在这里 
    //显示tabbar
    func showTabbar(){
        
        UIView.animateWithDuration(1) {//(0.05) {
            [weak self] in
            self!.bgView?.hidden = false
        }
    }
 
    
    //隐藏tabbar
    func hideTabbar() {
        UIView.animateWithDuration(1) {//(0.05) {
            [weak self] in
            self!.bgView?.hidden = true
        }
    }
    
    

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }