RootViewController animation transition, initial orientation is wrong
I looked into this just now because I kept getting the same issue. I randomly tried the following, and it worked perfectly:
[UIView transitionWithView:window duration:0.5 options:UIViewAnimationOptionTransitionCrossDissolve animations:^(void) { BOOL oldState = [UIView areAnimationsEnabled]; [UIView setAnimationsEnabled:NO]; [(ICApp *)sharedApplication.delegate window].rootViewController = self; [UIView setAnimationsEnabled:oldState]; } completion:nil];I know it's a bit odd to disable/enable animations inside an animation block, but the cross dissolve animates, and the rotation does not -- the view controller appears already rotated and ready to roll.
Just put in another animation option UIViewAnimationOptionAllowAnimatedContent:
[UIView transitionWithView:self.window duration:0.5 options:(UIViewAnimationOptionTransitionFlipFromLeft | UIViewAnimationOptionAllowAnimatedContent) animations:^{ self.window.rootViewController = newViewController;} completion:nil];