ios - 收到此错误:线程1:exc_bad_instruction(code = exc_i386_invop，subcode = 0x0)

我在swift 2.0中开发了一个iOS应用程序，并使用了一个称为“可达性”的类来确定用户是否连接到互联网。应用程序运行，但是编译器停止并输出此错误:

线程1:exc_bad_instruction(code = exc_i386_invop，subcode = 0x0)

这是代码，注释所在的位置会发生错误。

func updateInterfaceWithReachability (reachability: Reachability)  {

    if reachability == self.hostReachability
    {
        self.checkStatus(reachability)

        let netStatus: NetworkStatus = reachability.currentReachabilityStatus()
        let connectionRequired: Bool = reachability.connectionRequired()

        var baseLabelText: NSString = ""

        if connectionRequired
        {
            baseLabelText = NSLocalizedString("Cellular data network is available.\nInternet traffic will be routed through it after a connection is established.", comment: "Reachability text if a connection is required")
        }
        else
        {
            baseLabelText = NSLocalizedString("Cellular data network is active.\nInternet traffic will be routed through it.", comment: "Reachability text if a connection is not required")
        }
    }


    if reachability == self.internetReachability  // error displayed here
    {
        self.checkStatus(reachability)
    }

    if reachability == self.wifiReachability
    {
        self.checkStatus(reachability)
    }

}

我也这样声明了internetReachability

var internetReachability: Reachability!

这也是我在另一个称为checkStatus()的函数中初始化internetReachability的方式

func checkInternetConnection () {

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("reachabilityChanged"), name: kReachabilityChangedNotification, object: nil)

    let remoteHostName: String = "www.apple.com"


    self.hostReachability = Reachability.init(hostName: remoteHostName)
    self.hostReachability.startNotifier()
    self.updateInterfaceWithReachability(self.hostReachability)

    self.internetReachability = Reachability.reachabilityForInternetConnection()
    self.internetReachability.startNotifier()
    self.updateInterfaceWithReachability(self.internetReachability)

    self.wifiReachability = Reachability.reachabilityForLocalWiFi()
    self.wifiReachability.startNotifier()
    self.updateInterfaceWithReachability(self.wifiReachability)
}

不了解错误是什么以及如何解决。帮助表示赞赏。

最佳答案

代码在给定的行崩溃，因为您将变量声明为隐式解包的可选变量，这意味着在这种情况下该值将被解包，以便能够将其与reachability进行比较。但是，由于您尚未为internetReachability设置任何内容，因此它仍然是nil，并且由于无法解开nil而导致代码崩溃。

要解决此问题，您必须要么

明确检查nil

或将变量声明为var internetReachability: Reachability?，并在代码

中处理可选内容

或在尝试访问checkInternetConnection之前，请确保已调用internetReachability方法。

幸运的是，这里只需为您提供最后一个选项的简单版本，只需重新排列代码即可:

func checkInternetConnection () {
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("reachabilityChanged"), name: kReachabilityChangedNotification, object: nil)

    let remoteHostName: String = "www.apple.com"

    self.hostReachability = Reachability.init(hostName: remoteHostName)
    self.internetReachability = Reachability.reachabilityForInternetConnection()
    self.wifiReachability = Reachability.reachabilityForLocalWiFi()

    self.hostReachability.startNotifier()
    self.internetReachability.startNotifier()
    self.wifiReachability.startNotifier()

    self.updateInterfaceWithReachability(self.internetReachability)
    self.updateInterfaceWithReachability(self.wifiReachability)
    self.updateInterfaceWithReachability(self.hostReachability)
}

这样，您可以确保在self.updateInterfaceWithReachability尝试访问这三种可达性类型之前，已全部设置好。

关于ios - 收到此错误:线程1:exc_bad_instruction(code = exc_i386_invop，subcode = 0x0)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35070103/