iPhone中使用popover功能

- (IBAction)btnClicked:(id)sender {
PopTableViewController *pop = [[PopTableViewController alloc]init];//popover出来的控制器
pop.preferredContentSize = CGSizeMake(100, 100);//popover出来的控制器的尺寸
pop.modalPresentationStyle = UIModalPresentationPopover;//显示方式

UIPopoverPresentationController *popover = pop.popoverPresentationController;
popover.delegate = self;//遵循UIPopoverPresentationControllerDelegate
popover.barButtonItem = self.navigationItem.rightBarButtonItem;
popover.permittedArrowDirections = UIPopoverArrowDirectionAny;
[self presentViewController:pop animated:YES completion:nil];
}
#pragma mark - UIPopoverPresentationControllerDelegate代理方法
- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller{
return UIModalPresentationNone;
}