反射机制

在Swift中并不提倡使用Runtime，而是像其他语言一样使用反射(Reflect)。当然，目前Swift中的反射还没有其他语言中的反射功能强大，不仅远不及OC的Runtime，离Java的反射也有一定的距离。
Swift的反射机制是基于一个叫 Mirror 的 struct 来实现的

//反射事例

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//反射机制，取出类的名字，转换成类，还要强转成类的类型                  //1.从Bundle取出项目的名字（命名空间 = “项目的名字”+“.”+"类名"）         //2.修改命名空间，TARGETS -> Build Setting -> 输入product name ->修改即可          print("\(Bundle.main.infoDictionary)")         let clsN = Bundle.main.infoDictionary?["CFBundleName"] as? String ?? ""                   //3.let class NSClassFromString(className) as? class.Type         //4. let cls = class?.init()         let clsName = clsN + ".ViewController"         let cls = NSClassFromString(clsName) as? ViewController.Type         let vc = cls?.init()         window?.rootViewController = vc //        let vc = ViewController() //        window?.rootViewController = vc         window?.makeKeyAndVisible() //2.//MARK:添加子控制器     //反射机制，将控制器的属性添加到字典数组中,然后再创建一个存储有控制器的数组A，遍历存储有控制器所有属性的数组，并调用返回控制器的方法，添加到数组A中，并把数组赋值给viewControllers<br>//----反射控制器的方法     //根据命名空间+"."+"类名"反射出类     //再设置类的title,image,文字大小     //再创建导航将根控制器添加上去，返回导航     func setupChildViewController (){         let array = [["clsName":"SinaHomeViewController","title":"首页","imageName":"tabbar_home"],["clsName":"SinaHomeViewController","title":"信息","imageName":"tabbar_message_center"],              ["clsName":"","title":"","imageName":""],             ["clsName":"SinaHomeViewController","title":"发现","imageName":"tabbar_discover"],["clsName":"SinaHomeViewController","title":"我","imageName":"tabbar_profile"]]                   var arrayVc = [UIViewController]()         for dict in array{             arrayVc.append(addViewController(dict: dict))         }         viewControllers = arrayVc     }          func addViewController(dict:[String:String])-> UIViewController{         //判断字典中是否有title,类名，imageName         guard let clsName = dict["clsName"],              let title = dict["title"],              let imageName = dict["imageName"],              let cls = NSClassFromString(Bundle.main.nameSpace + "." + clsName) as? UIViewController.Type else{           return UIViewController()         }         let vc = cls.init()         vc.title = title         vc.tabBarItem.image = UIImage(named: imageName)         vc.tabBarItem.selectedImage = UIImage(named: imageName + "_selected")?.withRenderingMode(.alwaysOriginal)         vc.tabBarItem.setTitleTextAttributes([NSForegroundColorAttributeName:UIColor.black], for: .normal)         let nav = SinaNavController(rootViewController: vc)         return nav     }