纯代码实现 presentAsPopView

「爱情、让人受尽委屈。」 2022-02-26 02:44 184阅读 0赞

在iOS中，segue的class为`UIStoryboardSegue`，用于storyboard中不同视图控制器间转场，即从一个视图控制器转场到另一个视图控制器。Segue的起点必须是一个view或者定义某些操作的对象，如：`UIBarButtonItem`、`UIControl`和`UIGestureRecognizer`。

Segue分为以下几种类型，其中Push、Modal、Popover和Replace已弃用。

*  Show
 *  Show Detail
 *  Present Modally
 *  Present as Popover
 *  Custom
 *  Push
 *  Modal
 *  Popover
 *  Replace

在iPhone中有Show、Show Detail、Present Modally、Custom四种不同类型，iPad中有Show、Show Detail、Present Modally、Present as Popover、Custom五种不同类型。

我想要阐释的是Present as Popover，在iPhone和iPad上为两种展开模式，swift代码实现如下：

let navigationFilterVc = UIStoryboard(name: "Search", bundle: currentBundle).instantiateViewController(withIdentifier: "SearchViewController") as? UINavigationController
            if let navVc = navigationFilterVc,let filterVc = navVc.children.first as? TeacherFilterContainerViewController  {
               //这个模式只在iPad上生效
                navVc.modalPresentationStyle = .popover
                let popoverPresentationController = navVc.popoverPresentationController
                if let _popoverPresentationController = popoverPresentationController{
                    _popoverPresentationController.barButtonItem = barButton
                    _popoverPresentationController.sourceView = self.view
                   //修改弹出来的popView的大小
                    let size = _popoverPresentationController.sourceRect.size
                    navVc.preferredContentSize = CGSize(width: size.width, height: size.height + 800)
                }
                self.present(navVc, animated: true, completion: nil)
            }

效果如下图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI5MzgxOTQ_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI5MzgxOTQ_size_16_color_FFFFFF_t_70]: /images/20220226/6537d758e6b74a049d947fab30c15717.png