如何使用Swift 3.0中的NotificationCentre和Swift 2.0中的NSNotificationCenter传递数据？

Question

我在我的swift ios应用中实现了socket.io。

目前在几个面板上我正在监听服务器并等待收到的消息。我通过调用每个面板的getChatMessage功能这样做：

func getChatMessage(){ 
    SocketIOManager.sharedInstance.getChatMessage { (messageInfo) -> Void in 
     dispatch_async(dispatch_get_main_queue(), {() -> Void in 
      //do sth depending on which panel user is 
     }) 
    } 
} 

但是我注意到这是一个错误的做法，我需要去改变它 - 现在我要开始监听传入的消息只有一次，当任何消息来 - 将此消息传递给任何侦听它的面板。

所以我想通过NSNotificationCenter传入消息。到目前为止，我能够传递发生了什么事情的信息，但不传递数据本身。我是这样做的：

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.showSpinningWheel(_:)), name: showSpinner, object: nil) 

然后我有一个调用的函数：

func showSpinningWheel(notification: NSNotification) { 
} 

，我想叫它我做的任何时间：

NSNotificationCenter.defaultCenter().postNotificationName(hideSpinner, object: self) 

所以，我怎么能传递对象messageInfo并将其包含在被调用的函数中？

Answer 1

夫特使用userInfo它的类型的一个可选的字典2.0

通行证信息[NSObject的：AnyObject]？

let imageDataDict:[String: UIImage] = ["image": image] 

    // Post a notification 
    NSNotificationCenter.defaultCenter().postNotificationName(notificationName, object: nil, userInfo: imageDataDict) 

// Register to receive notification in your class 
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(self.showSpinningWheel(_:)), name: notificationName, object: nil) 

// handle notification 
func showSpinningWheel(notification: NSNotification) { 
    if let image = notification.userInfo?["image"] as? UIImage { 
    // do something with your image 
    } 
} 

雨燕3.0的版本

用户信息现在只需[AnyHashable：任何]？作为参数，由我们提供的字典字面斯威夫特

let imageDataDict:[String: UIImage] = ["image": image] 

    // post a notification 
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "notificationName"), object: nil, userInfo: imageDataDict) 
    // `default` is now a property, not a method call 

// Register to receive notification in your class 
NotificationCenter.default.addObserver(self, selector: #selector(self.showSpinningWheel(_:)), name: NSNotification.Name(rawValue: "notificationName"), object: nil) 

// handle notification 
func showSpinningWheel(_ notification: NSNotification) { 

    if let image = notification.userInfo?["image"] as? UIImage { 
    // do something with your image 
    } 
} 

注：通知“名称”不再是字符串，但类型Notification.Name的，因此为什么我们使用NSNotification.Name(rawValue:"notificationName")，我们可以使用我们自己的自定义通知来扩展Notification.Name。

extension Notification.Name { 
static let myNotification = Notification.Name("myNotification") 
} 

// and post notification like this 
NotificationCenter.default.post(name: .myNotification, object: nil) 

Answer 2

你好@sahil我更新了SWIFT 3

let imageDataDict:[String: UIImage] = ["image": image] 

    // post a notification 
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "notificationName"), object: nil, userInfo: imageDataDict) 
    // `default` is now a property, not a method call 

// Register to receive notification in your class 
NotificationCenter.default.addObserver(self, selector: #selector(self.showSpinningWheel(_:)), name: NSNotification.Name(rawValue: "notificationName"), object: nil) 

// handle notification 
func showSpinningWheel(_ notification: NSNotification) { 
     print(notification.userInfo ?? "") 
     if let dict = notification.userInfo as NSDictionary? { 
      if let id = dict["image"] as? UIImage{ 
       // do something with your image 
      } 
     } 
} 

答案希望这是有帮助的。谢谢