Subviews (MPMoviePlayerController) Not Animating With Container View - objective-c

Question

I'm adding an MPMoviePlayerController to a container view like so:
self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:self.videoURL];
. . .
self.moviePlayer.view.frame = self.frame;
[self addSubview:self.moviePlayer.view];
The self is the container view. This container view is instantiated off-screen when it is created by a view controller. So the container view resides in a view, and the MPMoviePlayerController resides in the container view.
When I animate the container view on screen, it works. Other views slide off and this view slides in. However, the MPMoviePlayerController stays put with its frame off-screen. So the MPMoviePlayerController's container view moves on screen, but it does not move with its container view. Is this not allowed, or am I missing something? The code for animating the container view is below:
[UIView animateWithDuration:ANIMATION_LENGTH animations:^() {
for(int i = beginTag; i < beginTag + [self subviews].count; i++) {
UIView *viewPointer = [self viewWithTag:i];
CGRect viewFrame = viewPointer.frame;
viewFrame.origin.x -= SCREEN_WIDTH_VC;
viewPointer.frame = viewFrame;
}
} completion:^(BOOL finished) {
[self.vidLoad playVideo];
}];
This takes care of animating elements that are on-screen off of the screen, and then bringing off-screen elements onto the screen. I'm glad to hear all suggestions!

Answer 1

Solved - this was a result of my own stupidity. The view hierarchy was indeed working, but when I assigned self.frame to moviePlayer.view.frame, it took the absolute coordinates of the container view, not relative coordinates.
A silly mistake. Basically, I just had to write
self.moviePlayer.view.frame = CGRectMake(0, 0, SCREEN_WIDTH_VC, SCREEN_HEIGHT_VC);
This would place it right on top of the container view, as these coordinates are relative to that container view and not the screen (I just confused myself).