ios - 如何在UIBarbutton中将UIAlertcontroller实现为PopOver(向上箭头方向)

Question

我知道这是一个老派的问题-但我确实在网上搜索并发现不赞成使用的解决方案。我将如何在 barButton 中将 UIAlertcontroller 实现为 popOver(箭头向上)。这是代码:

 - (IBAction)eventSortingAction:(UIBarButtonItem *)sender {

UIAlertController * view=   [UIAlertController
                         alertControllerWithTitle:@"My Title"
                         message:@"Select you Choice"
                         preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction* ok = [UIAlertAction
                 actionWithTitle:@"OK"
                 style:UIAlertActionStyleDefault
                 handler:^(UIAlertAction * action) {
                     //Do some thing here
                     [view dismissViewControllerAnimated:YES completion:nil];

                 }];
UIAlertAction* cancel = [UIAlertAction
                     actionWithTitle:@"Cancel"
                     style:UIAlertActionStyleCancel
                     handler:^(UIAlertAction * action) {
                         [view dismissViewControllerAnimated:YES completion:nil];

                     }];
[view addAction:ok];
[view addAction:cancel];
[view setModalPresentationStyle:UIModalPresentationPopover];
view.modalInPopover = YES;
view.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
view.popoverPresentationController.delegate = self;
[self presentViewController:view animated:YES completion:nil];

UIView* senderView = [sender valueForKey:@"view"]; //HACK
UIPopoverPresentationController* popover = view.popoverPresentationController;
if (popover) {
   popover.sourceView = senderView;
   popover.sourceRect = senderView.bounds;
   popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
   popover.barButtonItem = self.actionBarButton;
   popover.delegate = self;
}}

显然，我总是得到“popover = nil”。请帮忙!提前致谢!

顺便说一下，这段代码不是我的，只是在Xcode中对其进行测试。

Answer 1

提醒一下，因为这是Google的最佳结果:

popPresenter.barButtonItem是popPresenter.sourceView + popPresenter.sourceRect的替代方法

See (source)

关于OP问题，应使用IBAction参数sender。

UIPopoverPresentationController *popPresenter = [alertController
                                             popoverPresentationController];
popPresenter.barButtonItem = sender;
[self presentViewController:alertController animated:YES completion:nil];