Xcode 7.3 autocomplete is so frustrating

Question

There is a new autocomplete in Xcode. Probably might be useful because it checks not only beginning of names etc. But I found that very often it doesn\'t find a class name o

Answer 1

Xcode 7.3.1

1. In Xcode > Preferences > Text Editing

   uncheck Enable type-over completions

2. restart Xcode