objective-c 错误：协议不可用，转储回溯
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Error: Protocol not available, dumping backtrace
提问by Rahul Mayani
2016-09-17 15:16:04.386085 appDemo[2371:94976] [] __nwlog_err_simulate_crash simulate crash already simulated **"nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available"**
2016-09-17 15:16:04.386676 appDemo[2371:94976] [] nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace:
[x86_64] libnetcore-856.1.8
0 libsystem_network.dylib 0x0000000112dc780e __nw_create_backtrace_string + 123
1 libnetwork.dylib 0x0000000113bfa194 nw_socket_add_input_handler + 3002
2 libnetwork.dylib 0x0000000113bd7db8 nw_endpoint_flow_attach_protocols + 3768
3 libnetwork.dylib 0x0000000113bd6dd5 nw_endpoint_flow_setup_socket + 563
4 libnetwork.dylib 0x0000000113bd5b34 -[NWConcrete_nw_endpoint_flow startWithHandler:] + 2612
5 libnetwork.dylib 0x0000000113bf0d11 nw_endpoint_handler_path_change + 1261
6 libnetwork.dylib 0x0000000113bf0740 nw_endpoint_handler_start + 570
7 libdispatch.dylib 0x0000000112b44980 _dispatch_call_block_and_release + 12
8 libdispatch.dylib 0x0000000112b6e
2016-09-17 15:16:04.387153 appDemo[2371:94976] [] nw_endpoint_flow_attach_protocols [2 192.168.0.100:80 in_progress socket-flow (satisfied)] Attached flow protocol
2016-09-17 15:16:04.387679 appDemo[2371:94976] [] nw_connection_endpoint_report [2 192.168.0.100:80 in_progress socket-flow (satisfied)] reported event flow:start_connect
I'm using xcode 8version with ios 10. Now, I'm working an API. If, I use the API in Xcode 7its works fine but when same API I used in xcode 8error message appears Unable to parse.
我正在使用xcode 8带有ios 10. 现在，我正在开发一个 API。如果，我使用 APIXcode 7工作正常，但是当我在xcode 8错误消息中使用的相同 API出现无法解析时。
回答by Ankit Goyal
I found the solution as follows:
我找到了以下解决方案：
- In XCode menu, Go to Product > Scheme > Edit Scheme
- Open the Arguments tab
- Add the Environment Variable :-
OS_ACTIVITY_MODEisdisable
- 在 XCode 菜单中，转到产品 > 方案 > 编辑方案
- 打开参数选项卡
- 添加环境变量：-
OS_ACTIVITY_MODE是disable
回答by Vladimir Afinello
There's no SO_NOAPNFALLBKsocket option in man socket. I guess, this option is added by Apple and is related to push notifications services, which are not available on simulator.
man socket 中没有SO_NOAPNFALLBK套接字选项。我猜，这个选项是苹果添加的，与推送通知服务有关，模拟器上没有。
回答by C?ur
A cleaner solution (than the one given by Ankit Goyal) that fixes Simulator logs without affecting Device logs is available at https://stackoverflow.com/a/39651073/1033581:
https://stackoverflow.com/a/39651073/1033581提供了一种更清晰的解决方案（比 Ankit Goyal 给出的解决方案），它可以修复模拟器日志而不影响设备日志：
- Under Product > Scheme > Edit Scheme... > Run, set the OS_ACTIVITY_MODE environment variable to ${DEBUG_ACTIVITY_MODE} so it looks like this:
- 在 Product > Scheme > Edit Scheme... > Run 下，将 OS_ACTIVITY_MODE 环境变量设置为 ${DEBUG_ACTIVITY_MODE}，如下所示：
- Go to your project build settings, and click + to add a User-Defined Setting named DEBUG_ACTIVITY_MODE. Expand this setting and Click the + next to Debug to add a platform-specific value. Select the dropdown and change it to "Any iOS Simulator SDK". Then set its value to "disable" (Xcode 8) or "default" (Xcode 9) so it looks like this:
- 转到您的项目构建设置，然后单击 + 添加名为 DEBUG_ACTIVITY_MODE 的用户定义设置。展开此设置并单击 Debug 旁边的 + 以添加特定于平台的值。选择下拉菜单并将其更改为“Any iOS Simulator SDK”。然后将其值设置为“禁用”（Xcode 8）或“默认”（Xcode 9），如下所示：
回答by Ketan
To turn off Verbose for OS Activity Mode, You simply go to (in Xcode Menu Bar)
要关闭 OS 活动模式的 Verbose，您只需转到（在 Xcode 菜单栏中）
Product -> Scheme -> Edit Scheme-> Run (Left) -> Select Arguments -> On Environment Variables,
add OS_ACTIVITY_MODE and value as disable
Product -> Scheme -> Edit Scheme-> Run (Left) -> Select Arguments -> On Environment Variables,
添加 OS_ACTIVITY_MODE 和值作为禁用
