swift - 如何在没有 Storyboard 的情况下在 Swift 中以编程方式调整弹出窗口的大小？

Question

我正在尝试显示弹出 View ，但无法正确调整它的大小。我有以下代码显示我的弹出窗口，但 preferredContentSize 不起作用。查看总是全屏显示，这不是我想要的。如何正确调整弹出窗口的大小？

func presentPopup() {
        let popupVC = MyPopupViewController()
        popupVC.modalPresentationStyle = .overCurrentContext
        popupVC.modalTransitionStyle = .crossDissolve
        popupVC.popoverPresentationController?.permittedArrowDirections = .any
        // the following does not size the view, always come up full screen
        popupVC.preferredContentSize = CGSize(width: 200, height: 200) 
        present(popupVC, animated: true, completion: nil)
}

我想实现类似下面的东西。

请注意:我不使用 Storyboard，我正在寻找不使用或实例化 Storyboard的解决方案。

Answer 1

添加以下代码来实例化您的演示 Controller 并设置所需的配置。

let popupVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "MyPopoverVC")
popupVC.modalPresentationStyle = .popover
popupVC.preferredContentSize = CGSize(width: 200, height: 200)

let presentationController = MyControllerPresentAsPopover.configurePresentation(forController: popupVC)
presentationController.sourceView = sender
presentationController.sourceRect = sender.bounds
presentationController.permittedArrowDirections = [.any]
present(popupVC, animated: true, completion: nil)

然后创建名为 MyControllerPresentAsPopover 的类，它实现了 UIPopoverPresentationControllerDelegate 的委托(delegate)方法。见下面的代码:

class MyControllerPresentAsPopover : NSObject, UIPopoverPresentationControllerDelegate {

    private static let sharedInstance = MyControllerPresentAsPopover()

    private override init() {
        super.init()
    }

    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        return .none
    }

    static func configurePresentation(forController controller : UIViewController) -> UIPopoverPresentationController {
        controller.modalPresentationStyle = .popover
        let presentationController = controller.presentationController as! UIPopoverPresentationController
        presentationController.delegate = MyControllerPresentAsPopover.sharedInstance
        return presentationController
    }
}