UIViewControllerRepresentable 和 CNContactPickerViewController

问题描述

似乎无法创建与 CNContactPickerViewController 一起使用的 UIViewControllerRepresentable.

Can't seem to create a UIViewControllerRepresentable that works with CNContactPickerViewController.

使用 Xcode 11 beta 4，我已经使用其他 UIViewController 创建了许多其他 UIViewControllerRepresentable，并且这些工作正常.我已尝试更改 CNContactPickerViewController 的功能和委托的不同实现.

Using Xcode 11 beta 4, I've created number of other UIViewControllerRepresentable using other UIViewController and those have worked fine. I've tried changing the features of the CNContactPickerViewController and different implementations of the delegate.

import SwiftUI
import ContactsUI

// Minimal version
struct LookupContactVCR : UIViewControllerRepresentable {

    func makeUIViewController(context: Context) -> CNContactPickerViewController {
        let contactPickerVC = CNContactPickerViewController()
        contactPickerVC.delegate = context.coordinator
        return contactPickerVC
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator()
    }

    func updateUIViewController(_ uiViewController: CNContactPickerViewController, context: Context) {}

    class Coordinator: NSObject {}
}

extension LookupContactVCR.Coordinator : CNContactPickerDelegate {

    func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        print("Chose: \(contact.givenName)")
    }
}

#if DEBUG
struct LookupContact_Previews : PreviewProvider {
    static var previews: some View {
        LookupContactVCR()
    }
}
#endif

没有错误消息.但是屏幕始终是白色的，没有任何渲染.

No error messages. But the screen is always white with nothing rendered.

推荐答案

首先，请针对此问题提交 [Bug Report][1].[1]:https://bugreport.apple.com

First of all, please file a [Bug Report][1] for this issue.[1]: https://bugreport.apple.com

其次，此问题有 2 种解决方法:

1. 您可以使用 ABPeoplePickerNavigationController，它已被弃用但仍然有效.
2. 创建一个在 viewWillAppear 上呈现 CNContactPickerViewController 的 UIViewController，并使用这个新创建的带有 SwiftUI 的视图控制器.

1. You can use ABPeoplePickerNavigationController which is deprecated but still works.
2. Create a UIViewController which presents CNContactPickerViewController on viewWillAppear and use this newly created view controller with SwiftUI.

1.ABPeoplePickerNavigationController

import SwiftUI
import AddressBookUI

struct PeoplePicker: UIViewControllerRepresentable {
    typealias UIViewControllerType = ABPeoplePickerNavigationController

    final class Coordinator: NSObject, ABPeoplePickerNavigationControllerDelegate, UINavigationControllerDelegate {
        func peoplePickerNavigationController(_ peoplePicker: ABPeoplePickerNavigationController, didSelectPerson person: ABRecord) {
            <#selected#>
        }
        
        func peoplePickerNavigationControllerDidCancel(_ peoplePicker: ABPeoplePickerNavigationController) {
            <#cancelled#>
        }
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator()
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext<PeoplePicker>) -> PeoplePicker.UIViewControllerType {
        let result = UIViewControllerType()
        result.delegate = context.coordinator
        return result
    }
    
    func updateUIViewController(_ uiViewController: PeoplePicker.UIViewControllerType, context: UIViewControllerRepresentableContext<PeoplePicker>) { }

}

2.CNContactPickerViewController

EmbeddedContactPickerViewController

import Foundation
import ContactsUI
import Contacts

protocol EmbeddedContactPickerViewControllerDelegate: AnyObject {
    func embeddedContactPickerViewControllerDidCancel(_ viewController: EmbeddedContactPickerViewController)
    func embeddedContactPickerViewController(_ viewController: EmbeddedContactPickerViewController, didSelect contact: CNContact)
}

class EmbeddedContactPickerViewController: UIViewController, CNContactPickerDelegate {
    weak var delegate: EmbeddedContactPickerViewControllerDelegate?
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.open(animated: animated)
    }
    
    private func open(animated: Bool) {
        let viewController = CNContactPickerViewController()
        viewController.delegate = self
        self.present(viewController, animated: false)
    }
    
    func contactPickerDidCancel(_ picker: CNContactPickerViewController) {
        self.dismiss(animated: false) {
            self.delegate?.embeddedContactPickerViewControllerDidCancel(self)
        }
    }
    
    func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        self.dismiss(animated: false) {
            self.delegate?.embeddedContactPickerViewController(self, didSelect: contact)
        }
    }
    
}

EmbeddedContactPicker

import SwiftUI
import Contacts
import Combine

struct EmbeddedContactPicker: UIViewControllerRepresentable {
    typealias UIViewControllerType = EmbeddedContactPickerViewController
    
    final class Coordinator: NSObject, EmbeddedContactPickerViewControllerDelegate {
        func embeddedContactPickerViewController(_ viewController: EmbeddedContactPickerViewController, didSelect contact: CNContact) {
            <#selected#>
        }
        
        func embeddedContactPickerViewControllerDidCancel(_ viewController: EmbeddedContactPickerViewController) {
            <#cancelled#>
        }
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator()
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext<EmbeddedContactPicker>) -> EmbeddedContactPicker.UIViewControllerType {
        let result = EmbeddedContactPicker.UIViewControllerType()
        result.delegate = context.coordinator
        return result
    }
    
    func updateUIViewController(_ uiViewController: EmbeddedContactPicker.UIViewControllerType, context: UIViewControllerRepresentableContext<EmbeddedContactPicker>) { }

}

这篇关于UIViewControllerRepresentable 和 CNContactPickerViewController的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！