Question

Swift 5，Xcode 10

Xcode记录了一个奇怪的错误，该错误仅在我做一些非常具体的事情时才会发生：

我的应用程序在单击“登录”按钮后连接到FTP服务器，但是如果没有Internet连接，它将显示一个带有两个选项的对话框：1.切换到离线模式，2.重试。如果我选择“重试”，将设备连接到互联网，然后再次单击“登录”按钮，则会引发此错误。如果我切换到离线模式，或者在单击“登录”按钮之前已经存在互联网连接，则不会显示错误消息。

事后一切正常，但我仍然想摆脱它-如果可能的话：

2019-07-10 16:43:18.233414+0200 myapp[5256:111188] [] nw_dictionary_copy called with null dictionary
2019-07-10 16:43:18.235183+0200 myapp[5256:111188] [] __nwlog_err_simulate_crash simulate crash failed "nw_dictionary_copy called with null dictionary"
2019-07-10 16:43:18.237115+0200 myapp[5256:111188] [] nw_dictionary_copy called with null dictionary, dumping backtrace:
        [x86_64] libnetcore-1229.250.15
    0   libnetwork.dylib                    0x000000010c35c3b8 __nw_create_backtrace_string + 120
    1   libnetwork.dylib                    0x000000010c2b74e3 nw_dictionary_copy + 643
    2   libnetwork.dylib                    0x000000010c2fffe8 __nw_path_watch_simulator_network_changes_block_invoke + 40
    3   libsystem_notify.dylib              0x00000001090429b3 notify_register_mach_port + 7676
    4   libdispatch.dylib                   0x0000000108d82725 _dispatch_block_async_invoke2 + 83
    5   libdispatch.dylib                   0x0000000108d74db5 _dispatch_client_callout + 8
    6   libdispatch.dylib                   0x0000000108d7e792 _dispatch_workloop_invoke + 3251
    7   libdispatch.dylib                   0x0000000108d86ea3 _dispatch_workloop_worker_thread + 733
    8   libsystem_pthread.dylib             0x000000010915d611 _pthread_wqthread + 421
    9   libsystem_pthread.dylib             0x000000010915d3fd start_wqthread + 13
2019-07-10 16:43:18.241412+0200 myapp[5256:111188] [] nw_dictionary_apply called with null dictionary
2019-07-10 16:43:18.241561+0200 myapp[5256:111188] [] __nwlog_err_simulate_crash simulate crash failed "nw_dictionary_apply called with null dictionary"
2019-07-10 16:43:18.241923+0200 myapp[5256:111188] [] nw_dictionary_apply called with null dictionary, dumping backtrace:
        [x86_64] libnetcore-1229.250.15
    0   libnetwork.dylib                    0x000000010c35c3b8 __nw_create_backtrace_string + 120
    1   libnetwork.dylib                    0x000000010c2b6bf9 nw_dictionary_apply + 249
    2   libnetwork.dylib                    0x000000010c300002 __nw_path_watch_simulator_network_changes_block_invoke + 66
    3   libsystem_notify.dylib              0x00000001090429b3 notify_register_mach_port + 7676
    4   libdispatch.dylib                   0x0000000108d82725 _dispatch_block_async_invoke2 + 83
    5   libdispatch.dylib                   0x0000000108d74db5 _dispatch_client_callout + 8
    6   libdispatch.dylib                   0x0000000108d7e792 _dispatch_workloop_invoke + 3251
    7   libdispatch.dylib                   0x0000000108d86ea3 _dispatch_workloop_worker_thread + 733
    8   libsystem_pthread.dylib             0x000000010915d611 _pthread_wqthread + 421
    9   libsystem_pthread.dylib             0x000000010915d3fd start_wqthread + 13

我正在使用的唯一字典（afaik）是Bundle.main.infoDictionary?["CFBundleShortVersionString"]，用于显示版本号，但是即使没有这一行代码，也会记录错误。我还使用了内置的JSON解析器（带有Codable），但类似的错误将记录为自定义错误消息（显然不是）。

此错误是什么意思，我该如何解决？

我知道您可以设置自动断点，将其指向导致错误的或多或少准确的代码行，但是我需要为此添加什么符号/条件？

用空字典调用nw_dictionary_copy

0 个答案: