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动态加载视图

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步骤

  1. 获取 JSON 文件路径
  2. 根据路径创建 NSData 对象
  3. 根据 NSData 对象对 JSON 进行序列化, 得到一个数组
  4. 遍历数组, 提取出视图名,标题,图片名, 根据这三项创建视图, 并用 UINavigationViewController 包裹起来, 将 navi 添加到 tabBarViewController 中.

    MainVCSettings.json 文件

    [
    {
     "vcName": "HomeTableViewController",
     "title": "首页",
     "imageName": "tabbar_home"
    },
    {
      "vcName": "MessageTableViewController",
      "title": "消息",
      "imageName": "tabbar_message_center"
    },
    {
    "vcName": "NullViewController",
    "title": "",
    "imageName": ""
    },
    {
      "vcName": "DiscoverTableViewController",
      "title": "广场",
      "imageName": "tabbar_discover"
    },
    {
      "vcName": "ProfileTableViewController",
      "title": "我",
      "imageName": "tabbar_profile"
    }
    ]
    

    具体实现代码

    ```
    //
    // MainViewController.swift
    // weibo
    //
    // Created by Adrift on 16/6/5.
    // Copyright © 2016 年 Adrift. All rights reserved.
    //

import UIKit

class MainViewController: UITabBarController {

//MARK: - 生命周期
override func viewDidLoad() {
    super.viewDidLoad()
    //设置当前控制器对应的tabBar的颜色,iOS7之前如果设置了tintClor只有文字会变,而图片不会变
    tabBar.tintColor = UIColor.orangeColor()
    addChildViewControllers()
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(true)
    tabBar.addSubview(composeBtn)
    //计算宽度
    let width = UIScreen.mainScreen().bounds.width / CGFloat(viewControllers!.count)
    //创建 frame
    let rect = CGRect(x: 0, y: 0, width: width, height: tabBar.bounds.height)
    //设置 frame 跟 偏移量
    composeBtn.frame = CGRectOffset(rect, width * 2, 0)

}

//MARK: - 方法
/**
 添加所有子控制器
 */
func addChildViewControllers() {
    //获取json文件路径
    let path = NSBundle.mainBundle().pathForResource("MainVCSettings", ofType: "json")
    //通过文件路径创建NSData
    if let tempPath = path {
        let jsonData = NSData(contentsOfFile: tempPath)
        do {
            //序列化
            let dictArr = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions.MutableContainers) as! [[String: String]]
            //遍历数组,并创建视图控制器
            for dict in dictArr {
                addChildViewController(dict["vcName"]!, title: dict["title"]!, imageName: dict["imageName"]!)
            }
        }catch{
            print("crash")
            //并添加到TabBarViewController
            addChildViewController("HomeTableViewController", title: "首页", imageName: "tabbar_home")
            addChildViewController("MessageTableViewController", title: "消息", imageName: "tabbar_message_center")
            addChildViewController("NullViewController", title: "", imageName: "")
            addChildViewController("DiscoverTableViewController", title: "发现", imageName: "tabbar_discover")
            addChildViewController("ProfileTableViewController", title: "我的", imageName: "tabbar_profile")
        }
    }
}

/**
 将navigationViewController 添加到 TabBarViewController

 - parameter childController: 子控制图
 - parameter title:           标题
 - parameter imageName:       非高亮图片名称
 */
private func addChildViewController(childControllerName: String, title: String, imageName: String) {
    //获取命名空间
    let speaceName = NSBundle.mainBundle().infoDictionary!["CFBundleExecutable"] as! String

    //通过字符串转换为类
    let cls:AnyClass? = NSClassFromString(speaceName + "." + childControllerName)

    //通过类创建对象
    let vcCls = cls as! UIViewController.Type
    let vc = vcCls.init()

// 设置首页
vc.tabBarItem.image = UIImage(named: imageName)
vc.tabBarItem.selectedImage = UIImage(named: imageName +"_highlighted")
vc.title = title
//2. 给首页包装一个导航器
let navi = UINavigationController()
navi.addChildViewController(vc)
//3. 将导航控制器添加到当前控制器
addChildViewController(navi)
}

func composeBtnClick() {
    print("被点击...")
}

//MARK: - 懒加载
private lazy var composeBtn:UIButton = {

    let button = UIButton()

    //设置button图片
    button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
    button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)

    //设置button背景图片
    button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
    button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)

    //添加监听事件
    button.addTarget(self, action: #selector(MainViewController.composeBtnClick), forControlEvents: UIControlEvents.TouchUpInside)

    return button
}()

}
```
--EOF--

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