Setting OS_ACTIVITY_MODE = disable doesn’t resolve the issue but only turn off the logs
To fix the issue:
1- In storyboard select the TextView
2- From Xcode attributes inspector set:
Correction = No
Spell Checking = No
3- Fixed
The problem appears to happen because of failure to download assets for spell checking from:
http://mesu.apple.com/assets/com_apple_MobileAsset_TextInput_SpellChecker/com_apple_MobileAsset_TextInput_SpellChecker.xml
Hope this helps