将数据从SwiftUI视图传递到UIViewController

时间:2020-06-18 06:07:50

标签: ios swift uiviewcontroller storyboard swiftui

我一直在测试 SwiftUI ,以了解我可以使用它多远。现在,我想确定是否可以将SwiftUI View中的字符串直接传递给UIViewController。我想用UILabel显示此字符串。 UILabel是我故事板上的全部内容。

以下是我的视图控制器(UIViewController)。

import UIKit
import SwiftUI

class HomeViewController: UIViewController {
    var message = String()

    @IBOutlet weak var messageLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        messageLabel.text = message
    }
}

struct HomeViewControllerRepresentation: UIViewControllerRepresentable {
    func makeUIViewController(context: UIViewControllerRepresentableContext<HomeViewControllerRepresentation>) -> HomeViewController {
        UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "homeViewController") as! HomeViewController
    }

    func updateUIViewController(_ uiViewController: HomeViewController, context: UIViewControllerRepresentableContext<HomeViewControllerRepresentation>) {

    }
}

我的SwiftUI View如下。

import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
            VStack {
                NavigationLink(destination: HomeViewControllerRepresentation(message: "GGG")) { // Error
                    Text("Tap me")
                }
            }
            .navigationBarTitle("")
            .navigationBarHidden(true)
        }
    }
}

我希望我可以通过HomeViewControllerRepresentation传递一个字符串。但这是行不通的。是否有一种简单的方法将数据从SwiftUI View传递到UIViewController?谢谢。

1 个答案:

答案 0 :(得分:1)

UIViewControllerRepresentable不是代理,而是包装器,因此应像

一样手动传输所有内容
struct HomeViewControllerRepresentation: UIViewControllerRepresentable {
    var message: String

    func makeUIViewController(context: UIViewControllerRepresentableContext<HomeViewControllerRepresentation>) -> HomeViewController {
        let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "homeViewController") as! HomeViewController
        controller.message = self.message
        return controller
    }

    func updateUIViewController(_ uiViewController: HomeViewController, context: UIViewControllerRepresentableContext<HomeViewControllerRepresentation>) {

    }
}