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我使用 Backendless 作为后端（BaaS）。我刚刚注意到，Backendless 的服务器目前似乎有问题。我无法在他们的控制台上创建新的应用 ID。我偶然注意到，我所有的应用程序现在在应用程序启动期间都崩溃了。

我所有的应用程序都有相同的代码AppDelegate.swift：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    backendless.initApp(APP_ID, secret: SECRET_KEY, version: VERSION_NUM)
    backendless.messaging.registerForRemoteNotifications()

    let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)
    application.registerUserNotificationSettings(settings)
    application.registerForRemoteNotifications()

    application.applicationIconBadgeNumber = 0
    application.cancelAllLocalNotifications()
    return true
}

func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
    print("token: \(deviceToken)")

    // prepare the token to be saved from <xxxxxxxx xxxxxxxx...> to xxxxxxxxxxxxxxxxx...
    var token = NSString(format: "%@", deviceToken)
    token = token.stringByReplacingOccurrencesOfString(
        "<",
        withString: "")
    token = token.stringByReplacingOccurrencesOfString(
        ">",
        withString: "")
    token = token.stringByReplacingOccurrencesOfString(" ", withString: "")

    print(token)

    if Reachability.isConnectedToNetwork() == true {
        backendless.messaging.registerDeviceToken(token as String)
    }
}

我已经检查了可达性是否为真，但我的所有应用程序现在仍然崩溃，因为可达性为真，但后端已关闭...如果 3rd 方服务关闭，我如何避免应用程序崩溃？

非常感谢帮助。

我的Reachability.swift：

import Foundation
import SystemConfiguration

public class Reachability {

class func isConnectedToNetwork() -> Bool {

    var zeroAddress = sockaddr_in()
    zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    guard let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
        SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
    }) else {
        return false
    }

    var flags : SCNetworkReachabilityFlags = []
    if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
        return false
    }

    let isReachable = flags.contains(.Reachable)
    let needsConnection = flags.contains(.ConnectionRequired)
    return (isReachable && !needsConnection)
}

}

应用程序崩溃日志的一部分：

Incident Identifier: XX
CrashReporter Key:   XX
Hardware Model:      iPhone8,1
Process:             DJ Remake [4153]
Path:                /private/var/containers/Bundle/Application/567B8C2E-C288-454B-B11C-C35F93FB56DD/DJ Remake.app/DJ Remake
Identifier:          com.davidseek.dj-remake
Version:             1 (1.0.2)
Code Type:           ARM-64 (Native)
Parent Process:      launchd [1]

Date/Time:           2016-04-29 12:07:54.54 +0200
Launch Time:         2016-04-29 12:06:53.53 +0200
OS Version:          iOS 9.3.1 (13E238)
Report Version:      105

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Filtered syslog:
None found

Global Trace Buffer (reverse chronological seconds):
0.116172     CFNetwork                  0x0000000181819f30 NSURLConnection finished with error - code -1001
60.589908    CFNetwork                  0x0000000181729a44 TCP Conn 0x154699a70 SSL Handshake DONE
60.884066    CFNetwork                  0x0000000181729954 TCP Conn 0x154699a70 starting SSL negotiation
60.884409    CFNetwork                  0x00000001817cbda4 TCP Conn 0x154699a70 complete. fd: 9, err: 0
60.885311    CFNetwork                  0x00000001817cd2d0 TCP Conn 0x154699a70 event 1. err: 0
61.043184    CFNetwork                  0x00000001817cbda4 TCP Conn 0x1545a8190 complete. fd: 5, err: 0
61.043698    CFNetwork                  0x00000001817cd2d0 TCP Conn 0x1545a8190 event 1. err: 0
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