Go to Product => Scheme => Edit Scheme or use shortcut: CMD + <
Add OS_ACTIVITY_MODE as disable

And i use this answer: hide-xcode-8-logs from @iDevzilla to solve this:
Try this: On your Environment Variables set OS_ACTIVITY_MODE = disable
Go to Product => Scheme => Edit Scheme or use shortcut: CMD + <
Add OS_ACTIVITY_MODE as disable

And i use this answer: hide-xcode-8-logs from @iDevzilla to solve this:
Try this: On your Environment Variables set OS_ACTIVITY_MODE = disable