Question

我让NSObject类侦听来自我服务器的特定事件。

当发生此特定事件时，我想从名为TabBarController的UITabBarController更新现有tabBar项的徽章值。

如何从NSObject类访问它？

以下是监听该事件的NSOBject类。

启动应用程序时启动函数connectedToSocketIo（）。

打印（“事件正在工作”）显示在终端中，所以一切正常。

我现在唯一需要的是能够更新特定酒吧项目的徽章。

import Foundation
import UIKit
import SwiftyJSON


class SocketIOManager: NSObject{

    func connectedToSocketIo(){

        socket.on("post-channel:App\\Events\\contact\\newContactRequest"){ (data, ack) -> Void in

            let json = JSON(data)

            if json[0]["id"].string! == self.defaults.stringForKey("user_id")! {

                print("event is working")
                // I want to change the tab bar item badge here

            } else {

                print("no event")

            }
        } 
    }       
}

Answer 1

您应该尝试在UITabBarController课程中获得对SocketIOManager的引用。获得标签栏控制器后，您可以更改所需UITabBarItem的徽章值。

import Foundation
import UIKit
import SwiftyJSON

class SocketIOManager: NSObject {

    /*
        var tabBarController: UITabBarController!
    */

    // When the tabBarController gets set the connectedToSocketIO function gets automatically called.
    var tabBarController: UITabBarController! {
        didSet {
            connectedToSocketIO()
        }
    }

    init() {
        super.init()
    }

    // Either call this function
    init(tabBarController: UITabBarController) {
        super.init()

        self.tabBarController = tabBarController
        connectedToSocketIO()
    }

    // Or create a setter
    func setTabBarController(tabBarController: UITabBarController) {
        self.tabBarController = tabBarController
    }


    func connectedToSocketIo() {

        socket.on("post-channel:App\\Events\\contact\\newContactRequest"){ (data, ack) -> Void in

            let json = JSON(data)

            if json[0]["id"].string! == self.defaults.stringForKey("user_id")! {

                print("event is working")

                // Set the desired tab bar item to a given value
                tabBarController!.tabBar.items![0].badgeValue = "1"

            } else {

                print("no event")

            }
        } 
    }
}

修改

class CustomTabBarController: UITabBarController { var socketIOManager: SocketIOManager! viewDidLoad() { super.viewDidLoad() socketIOManager = SocketIOManager(tabBarController: self) } }

希望这有帮助！

Answer 2

@Jessy Naus

I removed:

the socket connection from the app delegate,
the override init function inside the socketIOManager so the init(UITabBarController)

and added the socket.connect() (from socket.io library) function inside the init function linked to the tab bar controller as follow:

init(tabBarController: UITabBarController) {

    super.init()

    self.tabBarController = tabBarController

    socket.connect()

    self.listeningToSocketEvent()
}

I have replaced "self.connectedToSocketIo()" by "listeningToSocketEvent()" has the meaning of this function is more clear.

All together following your instructions mentioned above = Works perfectly. So I put your answer as the good one.

Really not easy concept. Will still need some time to assimilate it and apply it to other components of the UI.

Thanks a lot for your help on this!

Answer 3

实际上，我发现了另一种避免触及socket.io实例的方法。

来源：

Swift 2: How to Load UITabBarController after Showing LoginViewController

我只是使用我的标签栏控制器建立链接，如下所示：

在我的SocketIOManager中

//"MainTabBarController" being the UITabBarController identifier I have set in the storyboard.
//TabBarController being my custom UITabBarController class. 
// receivedNotification() being a method defined in my custom TabBarController class

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)            

let tabBarController: TabBarController = mainStoryboard.instantiateViewControllerWithIdentifier("MainTabBarController") as! TabBarController

tabBarController.receivedNotification(1)

在我的TabBarController类中：

func receivedNotification(barItem: Int){

    if let actualValue = self.tabBar.items![barItem].badgeValue {

        let currentValue = Int(actualValue)

        self.tabBar.items![barItem].badgeValue = String(currentValue! + 1)

    } else {

        self.tabBar.items![barItem].badgeValue = "1"

    }

    // Reload tab bar item
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

    appDelegate.window?.rootViewController = self
}

从NSObject类更新UITabBarController条项

3 个答案: