iOS - UISCrollView 屏幕旋转后视图有偏移

-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
    
    CGFloat width =  self.scrollView.frame.size.width;
    CGFloat Height = self.scrollView.frame.size.height;
    
    [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
        
//        self.scrollView.frame = self.view.bounds;
       
        for (NSInteger i = 0; i < self.contentViewAr.count; i++) {
            UIView *viewC = self.contentViewAr[i];
            viewC.frame = CGRectMake(i * Height, 0, Height, width);
        }
        self.scrollView.contentSize = CGSizeMake(self.contentViewAr.count * Height, 0);
    } completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
        if (UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)) {
            if (self.selectIndex>0) {
//                self.scrollView.contentOffset = CGPointMake(Height  * self.selectIndex, 0);
                [self.scrollView setContentOffset:CGPointMake(Height  * self.selectIndex, 0) animated:YES];

            }
        }
        if (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation)) {
//            self.scrollView.contentOffset = CGPointMake(Height  * self.selectIndex, 0);
            [self.scrollView setContentOffset:CGPointMake(Height  * self.selectIndex, 0) animated:YES];
        }
    }];
}