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更新Xcode8.2以后 做个项目，发现控制台有如下的打印，项目可以正常运行。然而 出现了这样....fail，开始以为是与网络有关系，有类似socket的字样，然后去stackflower查阅资料，得知还是如8.1是多余的打印信息。
Xcode->EditScheme ->Run -> Arguments ->Environment Variables ->添加 Name（OS_ACTIVITY_MODE）:Value(disable)即可去除这条打印信息。
[] nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace:
[x86_64] libnetcore-856.30.16
0 libsystem_network.dylib 0x000000010caec666 __nw_create_backtrace_string + 123
1 libnetwork.dylib 0x000000010d8da006 nw_socket_add_input_handler + 3164
2 libnetwork.dylib 0x000000010d8b7555 nw_endpoint_flow_attach_protocols + 3768
3 libnetwork.dylib 0x000000010d8b6572 nw_endpoint_flow_setup_socket + 563
4 libnetwork.dylib 0x000000010d8b5298 -[NWConcrete_nw_endpoint_flow startWithHandler:] + 2612
5 libnetwork.dylib 0x000000010d8d0ae1 nw_endpoint_handler_path_change + 1261
6 libnetwork.dylib 0x000000010d8d0510 nw_endpoint_handler_start + 570
7 libdispatch.dylib 0x000000010c869978 _dispatch_call_block_and_release + 12
8 libdispatch.dylib 0x000000010c8930cd _dispatch_client_callout + 8
9 libdispatch.dylib 0x000000010c870e17 _dispatch_queue_serial_drain + 236
10 libdispatch.dylib 0x000000010c871b4b _dispatch_queue_invoke + 1073
11 libdispatch.dylib 0x000000010c874385 _dispatch_root_queue_drain + 720
12 libdispatch.dylib 0x000000010c874059 _dispatch_worker_thread3 + 123
13 libsystem_pthread.dylib 0x000000010cc3c4de _pthread_wqthread + 1129
14 libsystem_pthread.dylib 0x000000010cc3a341 start_wqthread + 13
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