ios - How to control object from another view controller - Objective-C -

let's have uiview object in viewcontroller a, @ point switched viewcontroller b. there way change uiview object in viewcontroller if example button pressed in viewcontroller b, when go viewcontroller uiview object in new position.

i tried doesn't seem anything.

-(void)viewwillappear:(bool)animated {     if (returning) {    self.aview.frame = cgrectmake(newx, newy, newwidth, newheight); } 

many thanks.

i'd suggest following given current starting point:

-(void)viewwillappear:(bool)animated {     [super viewwillappear:animated];      if (returning) {         self.aview.frame = cgrectmake(newx, newy, newwidth, newheight);          [self.aview setneedslayout];         [self.aview layoutifneeded];     } } 

i assume have found way setting returningfrom view controller b. (if not, there relevant information in other comments.)