Adding ToolBar to my Application - iphone

Question

I have a Button on a UIViewController. When i click on this Button, a UIToolBar gets displayed (Above the TabBarController). Now when i scroll the view down and click the Button the UIToolBar gets displayed at a different location (way above the tababar). What i want is to display the UIToolBar right above the TabBar at all instances (even when i scroll the page up or down and click the Button).
My code so far :
toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 300 , 320 , 55)];
According to this Code, i have given the X and Y cordinates of the toolBar to be 0 and 323. So even when i scroll the view up or down and click on the button, the toolbar will display at this location.
So how can i modify my code, to display it right above the TabBar at all instances. (Even when i scroll the view up or down)

Answer 1

It all depends where you will add your toolBar as a subview. If you want it always to be in the same place add it to the current UIWindow object.
UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window];
toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 300 , 320 , 55)];
on button click add the toolBar as a subview to the main window
[mainWindow addSubview:toolBar];

Answer 2

the problem is: You are adding the toolbar on the view with the coordinate hardcoded to (0, 300 , 320 , 55). And this is with respect to the view. But not the iphone screen or window. after adding when you scroll the view, you can see that the view contents are also scrolled up.
All you have to do is:
UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window];
toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 300 , 320 , 55)];
[mainWindow addSubview:toolBar];
[mainwindow bringSubviewToFront:toolBar];

Answer 3

It sounds like you need to implement the following hierarchy:
UITabBarController
V
UINavigationController
V
Your view controller
A UINavigationController has a toolbar property that can be displayed or hidden using its setToolbarHidden:animated: method.
The toolbar appears directly above the tab bar, as per your question.
If you add a toolbar as a subview of your scroll view, you need handle the scroll view delegate method scrollViewDidScroll: and reposition the scroll view each time it's fired.
That method - and adding a scroll view to the main window - both have the downside of covering part of the scroll view. Using a nav controller's toolbar, the height of your view controller's view is automatically reduced by the height of the toolbar so there is no overlap.
See the Apple documentation for a full description.