UIView animation doesn't work for UIViewController subclass - ios

Question

I try to add a subview(which is a subclassed UIViewController's view, consists of several UIButtons and UILabels) to current view, but the animation doesn't work, the subview just appeared without animation.
the code is :
[UIView beginAnimations:nil context:nil];
[UIView setAnimaitonCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationTransition:transition forView:thisPersonViewController.view cache:YES];
[self.view addSubView:thisPersonViewController.view];
[UIView commitAnimations];
it just doesn't work, but if I change forView parameter from the subview (thisPersonViewController.view) to self.view, the self.view did animate, that's curios.
My xcode version is 4.2 and SDK version is 5.0, thx for anyone who offer an solution!
===========THE FOLLOWING CODE WORKS FINE===============
CATransition *trans = [CATransition animation];
[trans setDuration:0.4f];
[trans setType:kCATransitionReveal];
[trans setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[thisPersonViewController.view layer]addAnimation:trans forKey:kCATransitionReveal];
[self.view addSubview:thisPersonViewController.view];
Another annoying question is if I change the CATransition type to kCATransitionFromBottom or something else the animation doesn't work again !

Answer 1

Add thisPersonViewController.view as a subview with a position somewhere off the screen. (i.e. frame x/y coordinate right at the bottom of the screen.)
Do this:
[UIView animateWithDuration:0.5f delay:0.0f options:UIViewAnimationCurveLinear animations:^(void)
{
// Move it to wherever you want to have it.
thisPersonViewController.view.frame = CGRectMake(0.0f, 0.0f, thisPersonViewController.view.frame.size.width, thisPersonViewController.view.frame.size.height);
}
completion:^(BOOL finished)
{
// Do something when it completes the animation if you so desire.
}];