UITextView scrolls automatically

Hello.

I have a problem with my app. When I tap to the text field the keyboard closes all the text view, thats why user cannot see the text that’s typed in the text field. How to make text view scrollable automatically and to make available to scroll the uiview? Also I need to make a button in the keyboard to quit a keyboard, how to make this? I need just to know with which concepts I need to deal with.

The problem is shown below on the picture.