NotificationCenter 通知Key的管理

通过Swift的extension， 可以很方便声明及管理NotificationCenter的key

创建一个文件FCNotificationConst,专门用来存放NotificationCenter的key

/* 登录相关变化等 */
extension Notification.Name {
    
    static let login = NSNotification.Name("com.fc.login")
    static let offlineLogin = NSNotification.Name("com.fc.offline.login")
    static let logout = NSNotification.Name("com.fc.logout")  
    static let otherLogin = NSNotification.Name("com.fc.otherLogin")
    static let sessionExpired = NSNotification.Name("com.fc.sessionExpired")

}

/* 具体业务相关 */
extension NSNotification.Name {
    // 切换语言
    static let langSwitched = NSNotification.Name("com.fc.lang.switched")
    //切换主题
    static let themeSwitched = NSNotification.Name("com.fc.theme.switched")
}

使用🌰

//发送切换语言的通知
NotificationCenter.default.post(name: .langSwitched, object: nil)
//监听语言的通知
NotificationCenter.default.addObserver(self, selector: #selector(onReceivedLangSwitchedNotification(_:)), name: .langSwitched, object: nil)

@objc func onReceivedLangSwitchedNotification(_ note: Any) {
   /*   接受到语言变更通知后的操作 */
 }