装有iOS 10的iPhone上的UIPopoverPresentationController [英] UIPopoverPresentationController on iPhone with iOS 10

问题描述

我正在尝试在iPhone上显示ViewController作为弹出框.我已经在SO和Web的其余部分上找到了几个答案，但到目前为止，都没有一个有效的方法.我写了一个简单的应用程序对此进行测试.

I'm trying to display a ViewController as a popover on an iPhone. I have already been through several answers on SO and the rest of the web but none have worked so far. I wrote a simple app to test this.

ViewController.swift:

ViewController.swift:

import UIKit

class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(clicked(_:)))
    }

    func clicked(_ sender: Any) {
        let vc = UIViewController()
        vc.view.backgroundColor = UIColor.blue
        vc.preferredContentSize = CGSize(width: 200, height: 200)
        vc.modalPresentationStyle = .popover
        present(vc, animated: true, completion: nil)

        let ppc = vc.popoverPresentationController
        ppc?.permittedArrowDirections = .any
        ppc?.delegate = self
        ppc?.barButtonItem = navigationItem.rightBarButtonItem
    }

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

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

故事板在NavigationController中嵌入了一个空的ViewController.

The storyboard has an empty ViewController embedded in a NavigationController.

运行此命令，我希望弹出窗口视图控制器显示在完成"按钮下.取而代之的是，全屏显示蓝色视图控制器.

Running this, I expected a popover view controller to show under the "done" button. Instead, the blue view controller is presented full screen.

有没有办法改变这种行为?

Is there a way to change this behaviour?

推荐答案

显示视图后，您正在连接委托.它如何从委托中返回.none并显示为弹出窗口.使用这个:-

You are connecting delegate after presenting view. How it will return .none from delegate and show as popover. Use this :-

    func clicked(_ sender: Any) {

        let vc = UIViewController()
        vc.view.backgroundColor = UIColor.blue
        vc.modalPresentationStyle = .popover

        vc.preferredContentSize = CGSize(width: 200, height: 200)

        let ppc = vc.popoverPresentationController
        ppc?.permittedArrowDirections = .any
        ppc?.delegate = self
        ppc?.barButtonItem = navigationItem.rightBarButtonItem
        ppc?.sourceView = sender

        present(vc, animated: true, completion: nil)

    }

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