Xcode 8 e Swift 3 中的可达性错误

Posted 2023-03-14

【中文标题】Xcode 8 e Swift 3 中的可达性错误

【英文标题】：reachability bug in Xcode 8 e Swift 3

【发布时间】：2016-08-05 01:07:26

【问题描述】：

我有一个大问题！ 我正在尝试在使用 Xcode 8 Beta 3 和 Swift 的应用中实现可达性。

当用户有互联网（wifi 或 4G）时：背景变为绿色。如果您不使用背景，它将是红色的。如果用户在蜂窝中访问互联网，则背景将是黄色的。

代码运行良好，但是当我关闭 wifi 时，它就坏了

这是我的 github 项目 - 我的“单一视图应用程序”

https://github.com/ewersoncastelo/testReachabilityXcode8

【问题讨论】：

dropbox.com/s/dtwfbjsl90f8bwx/…

@LeoDabus 好的。感谢您的时间。我稍后会尝试这段代码

完美运行。非常感谢

【参考方案1】：

您需要修复方法选择器。试试这样。

AppDelegate

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate 
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool 
        reachability = Reachability.forInternetConnection()
        reachability.startNotifier()
        return true
    
    func applicationWillResignActive(_ application: UIApplication) 
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    
    func applicationDidEnterBackground(_ application: UIApplication) 
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    
    func applicationWillEnterForeground(_ application: UIApplication) 
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    
    func applicationDidBecomeActive(_ application: UIApplication) 
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    
    func applicationWillTerminate(_ application: UIApplication) 

    

视图控制器

import UIKit
import SystemConfiguration

var reachability = Reachability()

class ViewController: UIViewController 

    override func viewDidLoad() 
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(reachabilityStatusChanged(_:)), name: .reachabilityChanged, object: nil)

    

    func updateInterfaceWithCurrent(networkStatus: NetworkStatus) 
        switch networkStatus 
        case NotReachable:
            view.backgroundColor = .red
            print("No Internet")
        case ReachableViaWiFi:
            view.backgroundColor = .green
            print("Reachable Internet")
        case ReachableViaWWAN:
            view.backgroundColor = .yellow
            print("Reachable Cellular")
        default:
            return
        

    
    override func viewWillAppear(_ animated: Bool) 
        super.viewWillAppear(animated)
        //
        updateInterfaceWithCurrent(networkStatus: reachability.currentReachabilityStatus())

    
    func reachabilityStatusChanged(_ sender: NSNotification) 
        guard let networkStatus = (sender.object as? Reachability)?.currentReachabilityStatus() else  return 
        updateInterfaceWithCurrent(networkStatus: networkStatus)
    
    override func viewWillDisappear(_ animated: Bool) 
        NotificationCenter.default.removeObserver(self, name: .reachabilityChanged, object: nil)
    
    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    

【讨论】：

它工作了，但不要忘记指定您需要添加 Reachability h 和 m 类