iPhone 10上的UIPopoverPresentationController与iOS 10

Question

我正在尝试将ViewController显示为iPhone上的弹出窗口。我已经在SO和其他网络上找到了几个答案，但到目前为止还没有。我写了一个简单的应用程序来测试它。

ViewController.swift：

    OutputStreamWriter out = new OutputStreamWriter( connection.getOutputStream()); 
out.write("string=" + stringToReverse);
 out.close(); 
BufferedReader in = new BufferedReader( new InputStreamReader( connection.getInputStream())); 
String decodedString; while ((decodedString = in.readLine()) != null) { System.out.println(decodedString); } in.close();

故事板中有一个嵌入在NavigationController中的空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？

Answer 1

您在呈现视图后连接代理。它将如何从委托返回。并显示为popover。使用此： -

    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)

    }

Answer 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
    }


}

Answer 3

以上解决方案在最新的iOS 12及更高版本中不再起作用。为了使其再次正常工作，请在viewController中重写-modalPresentationStyle以将其显示为弹出窗口，然后返回UIModalPresentationPopover。 另外提供一个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

Answer 4

添加：

vc.popoverPresentationController?.delegate = self 

就在行前：

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