objective c - Change UIToolbar color above UIKeyboard iOS 7 color -

i'm trying change color of uitoolbar above keyboard, can not recreate color black semi transparent keyboard, have tried this:

alerttoolbar.bartintcolor = [uicolor colorwithred:0.0f green:0.0f blue:0.0f alpha:0.5f]; 

but result:

alerttoolbar.barstyle = uibarstyleblack;

that should give ios 7 blur looking for. don't tint toolbar, set tool bar style.