How to make UIPopoverController keep same position after rotating?

Question

I can\'t keep popover the same position on the screen after rotation. Is there any good way to do that, because just setting some frame to popover works terrible after rotating.

Answer 1

UIPopoverController was deprecated in ios9 in favor of UIPopoverPresentationController introduced in ios8. (I went through this transition also when going from UIActionSheet to UIAlertController.) You have two choices (example in obj-C):

A. Implement the UIViewController method below (UIKit calls this method before changing the size of a presented view controller’s view).

- (void)viewWillTransitionToSize:(CGSize)size
           withTransitionCoordinator:(id)coordinator {
        [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
        [coordinator animateAlongsideTransition:nil
                                     completion:^(id _Nonnull context) {
                                         // Fix up popover placement if necessary, *after* the transition.
                                         // Be careful here if a subclass also overrides this method.
                                         if (self.presentedViewController) {
                                             UIPopoverPresentationController *presentationController =
                                                     [self.presentedViewController popoverPresentationController];
                                             UIView *selectedView = /** YOUR VIEW */;
                                             presentationController.sourceView = selectedView.superview;
                                             presentationController.sourceRect = selectedView.frame;
                                         }
                                     }];
    }

B. Alternatively, when configuring your UIPopoverPresentationController to present, also set its delegate. e.g. your presenting vc can implement UIPopoverPresentationControllerDelegate and assign itself as the delegate. Then implement the delegate method:

- (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController
          willRepositionPopoverToRect:(inout CGRect *)rect
                               inView:(inout UIView * _Nonnull *)view {
    UIView *selectedView = /** YOUR VIEW */;
    // Update where the arrow pops out of in the view you selected.
    *view = selectedView;
    *rect = selectedView.bounds;
}