Rotations.m

// Only called on iOS<8
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation __unused)toInterfaceOrientation duration:(NSTimeInterval __unused)duration {
    [self _beforeOrientationChange];
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation __unused)fromInterfaceOrientation {
    [self _afterOrientationChange];
}

// Only called on iOS>8
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [self _beforeOrientationChange];

    UIInterfaceOrientation oldOrientation = UIApplication.sharedApplication.statusBarOrientation;
    typeof(self) __weak weakSelf = self;
    [coordinator animateAlongsideTransition:nil completion:^(id<UIViewControllerTransitionCoordinatorContext> __unused context) {
        if (oldOrientation != UIApplication.sharedApplication.statusBarOrientation) {
            typeof(weakSelf) __strong strongSelf = weakSelf;
            [strongSelf _afterOrientationChange];
        }
    }];

    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}

- (void)_beforeOrientationChange {
    // your code here
}

- (void)_afterOrientationChange {
    // your code here
}