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标题: ios - Xcode 8 e Swift 3 中的可达性错误 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 13:55
标题: ios - Xcode 8 e Swift 3 中的可达性错误

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 View 应用程序”

https://github.com/ewersoncastelo/testReachabilityXcode8

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Best Answer-推荐答案

您需要修复方法选择器。像这样试试。

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) {

    }
}

View Controller

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.
    }
}

关于ios - Xcode 8 e Swift 3 中的可达性错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38779648/

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