屏幕旋转前后方向的获取

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
    //屏幕旋转前的方向
    UIInterfaceOrientation beforeTransition = [UIApplication sharedApplication].statusBarOrientation;
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
            //屏幕旋转后的方向
            UIInterfaceOrientation afterTransition = [UIApplication sharedApplication].statusBarOrientation;
    } completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
            
    }];
}