Xcode/iOS5: Move UIView up, when keyboard appears

To move the view up, just change its center. First, keep the original one in a CGPoint property.

- (void)viewDidLoad 
{
    ...
    self.originalCenter = self.view.center;
    ...
}

Then, change as needed when keyboard shows up:

self.view.center = CGPointMake(self.originalCenter.x, /* new calculated y */);

Finally, restore it when keyboard is hidden:

self.view.center = self.originalCenter;

Add animation sugar as you wish

You have more than one way to know when the keyboard appears.

Observing UIKeyboardDidShowNotification notification.

/* register notification in any of your initWithNibName:bundle:, viewDidLoad, awakeFromNib, etc. */
{
    ...
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];     
    ...
}

- (void)keyboardDidShow:(NSNotification *)note 
{
    /* move your views here */
}

Do the opposite with UIKeyboardDidHideNotification.

-OR-

Implement UITextFieldDelegate

Detect when editing begin/end to move views around.

- (void)textFieldDidBeginEditing:(UITextField *)textField 
{
    /* keyboard is visible, move views */
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    /* resign first responder, hide keyboard, move views */
}

Depending on the actual text fields you may need to track in which field is the user editing, add a timer to avoid moving views too much.