objective c - iOS move view above keyboard left black space -

i using uiview button @ bottom of view. want move button right above keyboard when keyboard shows / changes height.

the code using is:

- (void)keyboardframedidchange:(nsnotification *)notification {     cgrect keyboardendframe = [[[notification userinfo] objectforkey:uikeyboardframeenduserinfokey] cgrectvalue];     cgrect keyboardbeginframe = [[[notification userinfo] objectforkey:uikeyboardframebeginuserinfokey] cgrectvalue];      cgrect newframe = self.view.frame;     cgrect keyboardframeend = [self.view convertrect:keyboardendframe toview:nil];     cgrect keyboardframebegin = [self.view convertrect:keyboardbeginframe toview:nil];      newframe.origin.y -= (keyboardframebegin.origin.y - keyboardframeend.origin.y);     self.view.frame = newframe; } 

and in viewdidload:

[[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(keyboardframedidchange:) name:uikeyboarddidchangeframenotification object:nil]; 

this code works find on iphone6, if in iphone 5 , using chinese keyboard there black space: