Swift 4 循环动态创建对象

通过NSClassFromString动态创建TabBar控制器的子控制器，主要注意点在获取其类名时还需要在之前加上工程名。

    //控制器的名字
    let ctrlNames = [
        "MainPageViewController",
        "NearShopViewController",
        "ChooseViewController",
        "MyViewController"]
    
    //标题
    let titles = ["首页","附近","精选","我的"]
    
    //tabbar图片
    let normalImageNames = [
    "icon_tab_shouye_normal",
    "icon_tab_fujin_normal",
    "icon_tab_selection_normal",
    "icon_tab_wode_normal"];
    
    //选中的tabbar图片
    let selectedImageNames = [
    "icon_tab_shouye_highlight",
    "icon_tab_fujin_highlight",
    "icon_tab_selection_highlight",
    "icon_tab_wode_highlight"];
    
    
    //动态创建对象
    let projectName = Bundle.main.infoDictionary?["CFBundleName"] as! String
    for i in 0..<ctrlNames.count
    {
        //类   通过NSClassFromString方法创建类，类的字符串为：工程名 + “.” + 类名      
        let cls = NSClassFromString(projectName + "." + ctrlNames[i]) as! UIViewController.Type
        //创建控制器对象
        let viewController = cls.init()
        //创建导航控制器
        let nav = UINavigationController(rootViewController: viewController)
        
        viewController.title = titles[i]
        viewController.tabBarItem.image = UIImage(named: normalImageNames[i])
        viewController.tabBarItem.selectedImage = UIImage(named: selectedImageNames[i])
        
        //添加子控制器
        addChildViewController(nav)
    }