我正在构建一个 SwiftUI 应用程序,它ViewController
通过UIViewControllerRepresentable
. 目标是UITextView
在我的 SwiftUI 应用程序中显示一个。这个的实现很简单,像这样:
// iOSTextView.swift
import SwiftUI
struct iOSTextView: UIViewControllerRepresentable {
@Binding var document: Document
@EnvironmentObject var userData: UserData
func makeUIViewController(context: Context) -> some UIViewController {
let view = iOSTextViewController()
return view
}
func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
}
}
注意EnvironmentObject
命名的UserData
. 这是一个包含一些通用数据的类,这些数据应该与我的应用程序中的每个视图共享,包括 UITextView ViewController。
// UserData.swift
import Foundation
final class UserData: ObservableObject {
@Published var someValue = 1
}
下面是我的iOSTextViewController
视图控制器:
// iOSTextViewController.swift
import UIKit
import SwiftUI
class iOSTextViewController: UIViewController, UIGestureRecognizerDelegate {
@EnvironmentObject var userData: UserData
// Create a Text View
let textView: UITextView = {
let tv = UITextView()
return tv
}()
override func viewDidLoad() {
super.viewDidLoad()
// Place the Text View on the view
view.addSubview(textView)
textView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
textView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true
textView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
textView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
// create attributed string
let string = "This is a string."
var attributes: [NSMutableAttributedString.Key: Any] = [
.foregroundColor: UIColor.red,
.font: UIFont(name: "Courier", size: 12)!
]
let myAttrString = NSMutableAttributedString(string: string, attributes: attributes)
textView.attributedText = myAttrString
}
}
我的问题:
如何传递
UserData
给我的 ViewController 命名iOSTextViewController
?我应该使用协调员吗?如何使用它EnvironmentObject
在我的 ViewController 中提供可用和同步?同样,我如何共享我的
document
绑定,因为它是基于文档的应用程序?