使用 Xcode 8 运行工程发现奇怪的日志输出

使用 Xcode 8
运行工程的时候，在打印台会发现如下这些奇怪的日志输出：

2016-09-19
10:43:44.001757
Demo[

7100:171568

]
subsystem: com.apple.UIKit, category: HIDEventFiltered,
enable_level: 0, persist_level: 0,
default_ttl: 0, info_ttl: 0, debug_ttl:
0, generate_symptoms: 0, enable_oversize:
1, privacy_setting: 2,
enable_private_data: 0[/code]

2016-09-19
10:43:44.024521
Demo[

7100:171568

]
subsystem: com.apple.UIKit, category: HIDEventIncoming,
enable_level: 0, persist_level: 0,
default_ttl: 0, info_ttl: 0, debug_ttl:
0, generate_symptoms: 0, enable_oversize:
1, privacy_setting: 2,
enable_private_data: 0 [/code]

2016-09-19
10:43:44.051333
Demo[

7100:171568

]
subsystem: com.apple.BaseBoard, category: MachPort, enable_level:
1, persist_level: 0, default_ttl:
0, info_ttl: 0, debug_ttl:
0, generate_symptoms: 0, enable_oversize:
0, privacy_setting: 0,
enable_private_data: 0 [/code]

2016-09-19
10:43:44.084921
Demo[

7100:171568

]
subsystem: com.apple.UIKit, category: StatusBar, enable_level:
0, persist_level: 0, default_ttl:
0, info_ttl: 0, debug_ttl:
0, generate_symptoms: 0, enable_oversize:
1, privacy_setting: 2,
enable_private_data: 0 [/code]

2016-09-19
10:43:44.132757
Demo[

7100:171568

]
subsystem: com.apple.BackBoardServices.fence, category: App,
enable_level: 1, persist_level: 0,
default_ttl: 0, info_ttl: 0, debug_ttl:
0, generate_symptoms: 0, enable_oversize:
0, privacy_setting: 0,
enable_private_data: 0[/code]

2016-09-19
10:43:47.127087
Demo[

7100:171568

]
subsystem: com.apple.UIKit, category: Touch, enable_level:
0, persist_level: 0, default_ttl:
1, info_ttl: 0, debug_ttl:
0, generate_symptoms: 0, enable_oversize:
1, privacy_setting: 2,
enable_private_data: 0 [/code]

2016-09-19
10:43:47.128826
Demo[7100:171568] subsystem:
com.apple.UIKit, category: Gesture, enable_level: 0,
persist_level: 0, default_ttl: 1,
info_ttl: 0, debug_ttl: 0,
generate_symptoms: 0, enable_oversize: 1,
privacy_setting: 2, enable_private_data:
0

解决方法：
Xcode8里边 Edit Scheme... -> Run -> Arguments,
在Environment Variables里边添加 OS_ACTIVITY_MODE ＝ disable

















最后点击 Close 完成！