Try this:
1- From xCode menu open: Product > Scheme > Edit Scheme
2- On your Environment Variables set OS_ACTIVITY_MODE = disable
不可用时改为大写Disable -> OS_ACTIVITY_MODE = Disable

屏幕快照 2016-09-20 上午9.16.46.png
1- From xCode menu open: Product > Scheme > Edit Scheme
2- On your Environment Variables set OS_ACTIVITY_MODE = disable
不可用时改为大写Disable -> OS_ACTIVITY_MODE = Disable