带有 iOS 10 的 iPhone 上的 UIPopoverPresentationController答案

【问题标题】：UIPopoverPresentationController on iPhone with iOS 10带有 iOS 10 的 iPhone 上的 UIPopoverPresentationController
【发布时间】：2017-05-18 06:30:01
【问题描述】：

我正在尝试将 ViewController 显示为 iPhone 上的弹出框。我已经在 SO 和其他网络上浏览过几个答案，但到目前为止都没有。我编写了一个简单的应用程序来测试它。

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。

运行这个，我希望弹出视图控制器显示在“完成”按钮下。相反，蓝色视图控制器全屏显示。

有没有办法改变这种行为？

【问题讨论】：

您必须设置sourceView 或sourceRect 例如ppc?.sourceView = sender as! UIView
@Bilal ppc?.barButtonItem = navigationItem.rightBarButtonItem 负责这一点

标签： ios iphone swift uipopovercontroller

【解决方案1】：

您在呈现视图后连接代理。它将如何从委托返回 .none 并显示为弹出框。使用这个：-

    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)

    }

【讨论】：

【解决方案2】：

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
        let ppc = vc.popoverPresentationController
        ppc?.permittedArrowDirections = .any
        ppc?.delegate = self
        ppc!.sourceView = sender as? UIView 
        ppc?.barButtonItem = navigationItem.rightBarButtonItem
        present(vc, animated: true, completion: nil)
    }

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


}

【讨论】：

【解决方案3】：

上述解决方案在最新的 iOS 12 及更高版本中不再有效。要让它再次工作，请在 viewController 中覆盖 -modalPresentationStyle 以显示为弹出框并返回 UIModalPresentationPopover。另外提供popoverPresentationController.delegate，实现adaptivePresentationStyleForPresentationController:traitCollection:并返回UIModalPresentationNone。

@interface PopoverViewController : UIViewController
@end

@implementation PopoverViewController

- (UIModalPresentationStyle)modalPresentationStyle
{
    return UIModalPresentationPopover;
}

@end

@interface ViewController ()<UIPopoverPresentationControllerDelegate>
@end

@implementation ViewController

- (IBAction)openPopover:(id)sender
{
    UIViewController* testVC = [[PopoverViewController alloc] init];
    testVC.view.backgroundColor = UIColor.yellowColor;
    UIPopoverPresentationController* popPresenter = [testVC popoverPresentationController];
    popPresenter.permittedArrowDirections = UIPopoverArrowDirectionUp;
    popPresenter.delegate = self;
    popPresenter.sourceView = sender;
    popPresenter.sourceRect = [sender bounds];
    [self presentViewController:testVC animated:YES completion:^{}];
}

#pragma mark protocol (UIPopoverPresentationControllerDelegate)

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection
{
    return UIModalPresentationNone;
}

@end

【讨论】：

【解决方案4】：

添加：

vc.popoverPresentationController?.delegate = self

就在该行之前：

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

【讨论】：