Several examples - CSS Menu Animations by Virgil Pana
Pare - Mobile Nav Animation by Jaden Dessureault
Interface GUI concept Part 2
Dribbble - Search UI Animation by Jokūbas Setkauskas
Classroom is a concept mobile app which helps first year students stay up-to-date with each of their tasks assigned to a course, specifically aimed per individual student. by Jurgen Ploeger
UI Movement is a community of design enthusiasts who share and discuss the most interesting and unique UI designs.
Jewelry E-Сommerce Application by Dima Panchenko - Dribbble
Here is what all 6 UI Trends we can hope for in App design trends go through a constant change.
Animated sliding tab bar by Virgil Pana, via Behance
Search Field Animation by Ramotion