当使用Xcode 8+并创建一个新的空白项目时，运行应用程序时会出现以下日志:
2016-06-13 16:33:34.406093 TestiOS10[8209:100611] bundleid: com.appc.TestiOS10, enable_level: 0, persist_level: 0, propagate_with_activity: 0
2016-06-13 16:33:34.406323 TestiOS10[8209:100607] Created DB, header sequence number = 248
2016-06-13 16:33:34.409564 TestiOS10[8209:100611] subsystem: com.apple.UIKit, category: HIDEvents, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0
2016-06-13 16:33:34.504117 TestiOS10[8209:100607] Created DB, header sequence number = 248
2016-06-13 16:33:34.548023 TestiOS10[8209:100607] subsystem: com.apple.BaseBoard, category: MachPort, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0
2016-06-13 16:33:34.568458 TestiOS10[8209:100608] subsystem: com.apple.FrontBoard, category: Common, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0
也许有人已经找到了这个的配置?
OS_ACTIVITY_MODE对我不起作用(这可能是因为我将disable拼写为disabled，但这不是更自然吗?!?)，或者至少没有阻止大量消息。这就是环境变量的真正含义。
https://llvm.org/svn/llvm-project/lldb/trunk/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
lldb_private::Error
PlatformDarwin::LaunchProcess(lldb_private::ProcessLaunchInfo &launch_info) {
// Starting in Fall 2016 OSes, NSLog messages only get mirrored to stderr
// if the OS_ACTIVITY_DT_MODE environment variable is set. (It doesn't
// require any specific value; rather, it just needs to exist).
// We will set it here as long as the IDE_DISABLED_OS_ACTIVITY_DT_MODE flag
// is not set. Xcode makes use of IDE_DISABLED_OS_ACTIVITY_DT_MODE to tell
// LLDB *not* to muck with the OS_ACTIVITY_DT_MODE flag when they
// specifically want it unset.
const char *disable_env_var = "IDE_DISABLED_OS_ACTIVITY_DT_MODE";
auto &env_vars = launch_info.GetEnvironmentEntries();
if (!env_vars.ContainsEnvironmentVariable(disable_env_var)) {
// We want to make sure that OS_ACTIVITY_DT_MODE is set so that
// we get os_log and NSLog messages mirrored to the target process
// stderr.
if (!env_vars.ContainsEnvironmentVariable("OS_ACTIVITY_DT_MODE"))
env_vars.AppendArgument(llvm::StringRef("OS_ACTIVITY_DT_MODE=enable"));
}
// Let our parent class do the real launching.
return PlatformPOSIX::LaunchProcess(launch_info);
}
因此，在环境变量中设置OS_ACTIVITY_DT_MODE为“NO”(在主要回答中的方案截图中解释的GUI方法)使它为我工作。
至于NSLog是系统消息、错误和你自己的调试的转储场所:一个真正的日志记录方法可能无论如何都被调用，例如https://github.com/fpillet/NSLogger。
OR
喝新的酷爱饮料:http://asciiwwdc.com/2016/sessions/721 https://developer.apple.com/videos/play/wwdc2016/721/
在彻底检查整个日志API之后出现一些问题并不奇怪。
齿顶高
不管怎样，NSLog只是一个垫片:
https://developer.apple.com/library/content/releasenotes/Miscellaneous/RN-Foundation-OSX10.12/
NSLog / CFLog . log
NSLog现在只是在大多数情况下os_log的一个垫片。
现在只有为另一个env变量引用源代码才有意义。这是一个完全不同的地方，这一次来自苹果内部。不知道为什么它们重叠。[关于NSLog的错误评论被删除]
[编辑22 Sep]:我想知道“发布”和“流”与“调试”有什么不同。来源不够。
https://github.com/macosforge/libdispatch/blob/8e63547ea4e5abbfe55c0c3064181c4950a791d3/src/voucher.c
e = getenv("OS_ACTIVITY_MODE");
if (e) {
if (strcmp(e, "release") == 0) {
mode = voucher_activity_mode_release;
} else if (strcmp(e, "debug") == 0) {
mode = voucher_activity_mode_debug;
} else if (strcmp(e, "stream") == 0) {
mode = voucher_activity_mode_stream;
} else if (strcmp(e, "disable") == 0) {
mode = voucher_activity_mode_disable;
}
}
