我尝试通过UIPopoverPresentationController在iPad上呈现弹出窗口。一切都很好，但似乎没有调用UIAdaptivePresentationControllerDelegate的方法。AddRewardController*addRewardVC=[[AddRewardControlleralloc]initWithNibName:@"AddRewardController"bundle:nil];addRewardVC.modalPresentationStyle=UIModalPresentationPopover;addRewardVC.preferr