在ipad開發(fā)中，ios9中的UIPopoverController 運用的非常多，它繼承的不是ViewController 而是NSObject,這就說它的顯示依靠其他視圖控制器，但是在ios10中它被廢棄了用p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px STXinwei; color: #00afca}span.s1 {font-variant-ligatures: no-common-ligatures}

UIPopoverPresentationController替代，雖然可以使用作為程序員跟著Apple公司走是沒錯的，實現(xiàn)內(nèi)容和顯示大致如下：

QQ20161225-0.png

iOS9 初始化代碼：

  UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
  UIViewController *controller = [storyboard instantiateViewControllerWithIdentifier:@"PopContentController"];
  UIPopoverController *popVc = [[UIPopoverController alloc] initWithContentViewController:controller];
  [popVc presentPopoverFromBarButtonItem:self.leftButton permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

iOS10 的使用

 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *controller = [storyboard instantiateViewControllerWithIdentifier:@"PopContentController"];

    
    controller.modalPresentationStyle = UIModalPresentationPopover;
    [self presentViewController:controller animated:YES completion:nil];
    
    // configure the Popover presentation controller
    UIPopoverPresentationController *popController = [controller popoverPresentationController];
    popController.permittedArrowDirections = UIPopoverArrowDirectionAny;
    popController.barButtonItem = self.leftButton;
    popController.delegate = self;