xcode8升级日志输出N多警告和log

更新了Xcode8，今天新建工程的时候发现控制台会多出很多log。就好像这样

2016-10-21 10:49:02.108819 PlayRecord[2825:88560] 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

2016-10-21 10:49:02.111633 PlayRecord[2825:88560] 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

2016-10-21 10:49:02.181583 PlayRecord[2825:88549] 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

2016-10-21 10:49:02.246570 PlayRecord[2825:88085] 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

fatal error: unexpectedly found nil while unwrapping an Optional value

之前用的Xcode7工程还好好的。所以猜测是Xcode升级之后的一些设置或者工程配置原因。

要解决这个问题需要去工程中去添加一项配置：工程名字 - Edit Scheme - Run - Arguments - Environment Variables，在Environment Variables下边添加：OS_ACTIVITY_MODE, value值设置为disable，添加完之后记得勾选此项