Nope, you can control the phone directly inside the case. Touchscreen works fine too (I have a screen protector on as well).
"I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me." Galatians 2:20
Device: T-Mobile Galaxy Note 3