出于纯文字代码不够直观的考虑，每种方法都附上图片，方便转换吸收。

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方法一： 使用字典创建

extension MainViewController {

// 设置所有子控制器

fileprivate func setupChildControllers() {

let array = [

["className": "HomeViewController", "title": "首页", "imageName":"TabBar_home_23x23_"],

["className": "MessageViewController", "title": "消息", "imageName":"TabBar_message_23x23_"],

["className": "DiscoverViewController", "title": "发现", "imageName":"TabBar_discover_23x23_"],

["className": "MeViewController", "title": "我", "imageName":"TabBar_me_23x23_"]]

//创建视图数组

var arrayM = [UIViewController]()

for dict in array {

arrayM.append(controllerDict(dict: dict))

}

viewControllers = arrayM

}

/// 使用字典创建单个控制器

/// - Parameter dict: 字典信息【className, title, imageName】

/// - Returns: 子控制器

fileprivate func controllerDict(dict:[String: String]) -> UIViewController {

// 获取字典内容  命名空间

guard let className = dict["className"],

let title = dict["title"],

let imageName = dict["imageName"],

let ns = Bundle.main.infoDictionary?["CFBundleName"] as? String,

let cls = NSClassFromString(ns + "." + className) as? UIViewController.Type

else {

return UIViewController()

}

// 初始化控制器

let vc = cls.init()

// 设置标题和图标

vc.title = title

vc.tabBarItem.image = UIImage(named: imageName)

vc.tabBarItem.selectedImage = UIImage(named: imageName + "selected")

// 给每个控制器包装一个导航控制器

let nav = NavigationController(rootViewController: vc)

return nav

}

}

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方法二：字符串转类别

extension MainViewController {

// 设置所有子控制器

fileprivate func addChildViewControllers() {

addChildViewController(childControllerName: "HomeViewController", title: "首页", imageName: "TabBar_home_23x23_")

addChildViewController(childControllerName: "MessageViewController", title: "消息", imageName: "TabBar_message_23x23_")

addChildViewController(childControllerName: "DiscoverViewController", title: "发现", imageName: "TabBar_discover_23x23_")

addChildViewController(childControllerName: "MeViewController", title: "我", imageName:

"TabBar_me_23x23_")

}

// 创建单个控制器

fileprivate func addChildViewController(childControllerName: String, title: String, imageName: String) {

// 动态获取命名空间

// 将字符串转化为类，默认情况下命名空间就是项目名称，但是命名空间可以修改

guard let ns = Bundle.main.infoDictionary?["CFBundleExecutable"] as? String,

let cls = NSClassFromString(ns + "." + childControllerName) as? UIViewController.Type

else {

return

}

// 初始化控制器

let vc = cls.init()

// 设置对应的数据

vc.tabBarItem.image = UIImage(named: imageName)

vc.tabBarItem.selectedImage = UIImage(named: imageName + "selected")

// 设置子控制器标题

vc.title = title

// 给每个控制器包装一个导航控制器

let nav = NavigationController(rootViewController: vc)

addChildViewController(nav)

}

}

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方法三：直接包装视图控制器

class MainViewController: UITabBarController {

override func viewDidLoad() {

super.viewDidLoad()

addChildViewControllers()

}

}

extension MainViewController {

// 设置所有子控制器

fileprivate func addChildViewControllers() {

addChildViewController(vc: HomeViewController(), title: "首页", imageName: "TabBar_home_23x23_")

addChildViewController(vc: MessageViewController(), title: "消息", imageName: "TabBar_message_23x23_")

addChildViewController(vc: DiscoverViewController(), title: "发现", imageName: "TabBar_discover_23x23_")

addChildViewController(vc: MeViewController(), title: "我", imageName: "TabBar_me_23x23_")

}

// 创建单个控制器

fileprivate func addChildViewController(vc: UIViewController, title: String, imageName: String) {

// 设置子控制器标题

vc.title = title

// 设置子控制器图标

vc.tabBarItem.image = UIImage(named: imageName)

vc.tabBarItem.selectedImage = UIImage(named: imageName + "selected") // TabBar_home_23x23_selected

// 给每个子控制器包装一个导航控制器

let nav = NavigationController(rootViewController: vc)

addChildViewController(nav)

}

}

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