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
2016-09-19 10:43:44.024521 Demo[7100:171568] subsystem: com.apple.UIKit,category: HIDEventIncoming,enable_private_data: 0
2016-09-19 10:43:44.051333 Demo[7100:171568] subsystem: com.apple.BaseBoard,category: MachPort,enable_level: 1,enable_oversize: 0,privacy_setting: 0,enable_private_data: 0
2016-09-19 10:43:44.084921 Demo[7100:171568] subsystem: com.apple.UIKit,category: StatusBar,enable_private_data: 0
2016-09-19 10:43:44.132757 Demo[7100:171568] subsystem: com.apple.BackBoardServices.fence,category: App,enable_private_data: 0
2016-09-19 10:43:47.127087 Demo[7100:171568] subsystem: com.apple.UIKit,category: Touch,default_ttl: 1,enable_private_data: 0
2016-09-19 10:43:47.128826 Demo[7100:171568] subsystem: com.apple.UIKit,category: Gesture,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！