ios - Firebase 应用配置崩溃

Question

我有一个适用于 iOS 的自定义键盘，它使用 Firebase 进行分析。 Firebase 应用程序配置是在初始化程序中使用 dispatch_once 子句完成的，其中 token 作为全局变量。

var token: dispatch_once_t = 0

class KeyboardViewController: UIInputViewController {
// ..
  override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    dispatch_once(&token) {
        FIRApp.configure()
    } // line 90
  }
// ..
}

这工作正常，但我收到许多崩溃报告，表明在配置应用程序时在许多设备上崩溃。我被困了好几天试图找出原因。这是崩溃报告堆栈跟踪之一的一部分:

Exception Type:  EXC_CRASH (SIGQUIT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Termination Signal: Quit: 3
Termination Reason: Namespace SIGNAL, Code 0x3
Terminating Process: launchd [1]
Triggered by Thread:  0

Thread 0 name:
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x000000018fab6338 __semwait_signal_nocancel + 8
1   libsystem_c.dylib               0x000000018f9e20dc nanosleep$NOCANCEL + 200 (nanosleep.c:104)
2   libsystem_c.dylib               0x000000018fa0568c sleep$NOCANCEL + 44 (sleep.c:62)
3   libsystem_dnssd.dylib           0x000000018fa6e7d4 ConnectToServer + 832 (dnssd_clientstub.c:607)
4   libsystem_dnssd.dylib           0x000000018fa6ff44 DNSServiceCreateConnection + 76 (dnssd_clientstub.c:1785)
5   libsystem_network.dylib         0x000000018fb2d318 __nw_resolver_set_update_handler_block_invoke + 872 (resolver.m:1031)
6   libdispatch.dylib               0x000000018f9711c0 _dispatch_client_callout + 16 (object.m:455)
7   libdispatch.dylib               0x000000018f97e860 _dispatch_barrier_sync_f_invoke + 84 (queue.c:3457)
8   libsystem_network.dylib         0x000000018fb2ce78 nw_resolver_set_update_handler + 208 (resolver.m:1275)
9   SystemConfiguration             0x0000000190f8a16c __SCNetworkReachabilityRestartResolver + 260 (SCNetworkReachability.c:1711)
10  SystemConfiguration             0x0000000190f891c8 __SCNetworkReachabilitySetDispatchQueue + 764 (SCNetworkReachability.c:1823)
11  SystemConfiguration             0x0000000190f88ccc SCNetworkReachabilityScheduleWithRunLoop + 504 (SCNetworkReachability.c:1586)
12  CustomKeyboard              0x000000010013f630 -[FIRReachabilityChecker start] + 196
13  CustomKeyboard              0x000000010013abac -[FIRNetwork init] + 156
14  CustomKeyboard              0x0000000100132e28 -[FIRClearcutLogger init] + 416
15  CustomKeyboard              0x0000000100132c68 __35+[FIRClearcutLogger sharedInstance]_block_invoke + 36
16  libdispatch.dylib               0x000000018f9711c0 _dispatch_client_callout + 16 (object.m:455)
17  libdispatch.dylib               0x000000018f971fb4 dispatch_once_f + 56 (once.c:57)
18  CustomKeyboard              0x0000000100132c40 +[FIRClearcutLogger sharedInstance] + 108
19  CustomKeyboard              0x0000000100137214 +[FIRApp initClearcut] + 60
20  CustomKeyboard              0x0000000100136688 +[FIRApp configureDefaultAppWithOptions:sendingNotifications:] + 132
21  CustomKeyboard              0x000000010013643c +[FIRApp configure] + 316
22  libdispatch.dylib               0x000000018f9711c0 _dispatch_client_callout + 16 (object.m:455)
23  libdispatch.dylib               0x000000018f971fb4 dispatch_once_f + 56 (once.c:57)
24  CustomKeyboard              0x00000001000e314c _TFC19CustomKeyboard22KeyboardViewControllercfT7nibNameGSqSS_6bundleGSqCSo8NSBundle__S0_ + 1500 (KeyboardViewController.swift:90)
25  CustomKeyboard              0x00000001000e3270 _TToFC19CustomKeyboard22KeyboardViewControllercfT7nibNameGSqSS_6bundleGSqCSo8NSBundle__S0_ + 112 (KeyboardViewController.swift:0)
26  UIKit                           0x00000001971f7688 -[_UIViewServiceViewControllerOperator __createViewController:withContextToken:fbsDisplays:appearanceSerializedRepresentations:legacyAppearance:traitCollection:initialInterfaceOrientation:hostAccessibilityServerPort:canShowTextServices:replyHandler:] + 2216 (UIViewServiceViewControllerOperator.m:1732)
27  CoreFoundation                  0x0000000190aee160 __invoking___ + 144
28  CoreFoundation                  0x00000001909e1c3c -[NSInvocation invoke] + 284 (NSForwarding.m:2948)
29  CoreFoundation                  0x00000001909e66ec -[NSInvocation invokeWithTarget:] + 60 (NSForwarding.m:3019)

显然，调用 FIRApp.configure() 后的调用跟踪正在通过系统库。

从堆栈跟踪中观察到的一个问题是，崩溃与检查设备的可达性有关。但是，我尝试重现没有互联网连接但工作正常的场景。

请注意，所有崩溃都发生在 iOS 10 上，其中大部分发生在 iPhone 6 上。

如果您能帮助找出崩溃原因，我们将不胜感激。

Answer 1

不建议在扩展中使用 Firebase Analytics，因为 SDK 不能很好地支持扩展。与完整的应用程序相比，应用程序扩展的功能有限，因此 Firebase Analytics 在某些情况下可能无法正常工作，例如本例中的网络。该团队正在研究以后更好地支持扩展。

似乎像 Apple 所说的那样，网络在自定义键盘上不可用

"By default, a keyboard has no network access and cannot share a container with its containing app. To enable these things, set the value of the RequestsOpenAccess Boolean key in the Info.plist file to YES. Doing this expands the keyboard’s sandbox, as described in Designing for User Trust."

https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/CustomKeyboard.html#//apple_ref/doc/uid/TP40014214-CH16-SW1