[英]Implement webkit with swiftUI on macOS (And create a preview of a webpage)
我正在嘗試創建一個顯示該站點收件箱的菜單欄應用程序。 我想制作一個簡單的 function,它會打開一個帶有項目 url 的小彈出窗口(無需打開 safari)。 收件箱項目看起來像這樣
struct InboxItem: View {
@State var MesgSite: String = "https://duckduckgo.com"
@State private var showSafari = false
var body: some View {
VStack(alignment: .leading) {
Text("some text")
.background(SelectColor.opacity(0.5))
.onLongPressGesture {
//show preview of the MesgSite here
self.SelectColor = .blue
self.showSafari.toggle()
}.popover(isPresented: self.$showSafari) {
SafariPreview()
}
}
}
struct SafariPreview: View {
var body: some View {
VStack {
Text("Display the webpage here")
.padding()
}.frame(maxWidth: 533, maxHeight: 300)
}
}
我想,當有人長按該項目時,它應該像在 macOS 上的默認郵件應用程序中一樣預覽相關網頁,如下所示:
現在彈出窗口工作
我嘗試在SafariView
中添加一個wkwebview
和一個NSViewRepresentable
,但是我使用這個 SO post中的代碼得到了(類似的)以下錯誤消息
Use of undeclared type 'UIViewRepresentable'
TIA!
該項目的最基本版本可以在 github 上找到
更加關注問題
我也試圖想出一個解決方案。 由於我無法在網上找到任何文檔,因此我將提供我通過反復試驗找到的解決方案。
首先,事實證明UI...
在 macOS 上有對應的NS...
。 因此UIViewRepresentable
在 macOS 上將是NSViewRepresentable
。 接下來我發現了這個 SO 問題,它有一個 macOS 上的WKWebview
示例。 通過將該代碼與另一個 SO 問題的答案相結合,我還可以檢測到 url 更改以及視圖加載完成的時間。
這導致了以下代碼。 為清楚起見,我建議將其放在不同的文件中,例如WebView.swift
:
首先,導入需要的包:
import SwiftUI
import WebKit
import Combine
然后創建一個 model,其中包含您希望能夠在 SwiftUI 視圖中訪問的數據:
class WebViewModel: ObservableObject {
@Published var link: String
@Published var didFinishLoading: Bool = false
@Published var pageTitle: String
init (link: String) {
self.link = link
self.pageTitle = ""
}
}
最后,使用NSViewRepresentable
創建struct
,它將成為WebView()
的 HostingViewController,如下所示:
struct SwiftUIWebView: NSViewRepresentable {
public typealias NSViewType = WKWebView
@ObservedObject var viewModel: WebViewModel
private let webView: WKWebView = WKWebView()
public func makeNSView(context: NSViewRepresentableContext<SwiftUIWebView>) -> WKWebView {
webView.navigationDelegate = context.coordinator
webView.uiDelegate = context.coordinator as? WKUIDelegate
webView.load(URLRequest(url: URL(string: viewModel.link)!))
return webView
}
public func updateNSView(_ nsView: WKWebView, context: NSViewRepresentableContext<SwiftUIWebView>) { }
public func makeCoordinator() -> Coordinator {
return Coordinator(viewModel)
}
class Coordinator: NSObject, WKNavigationDelegate {
private var viewModel: WebViewModel
init(_ viewModel: WebViewModel) {
//Initialise the WebViewModel
self.viewModel = viewModel
}
public func webView(_: WKWebView, didFail: WKNavigation!, withError: Error) { }
public func webView(_: WKWebView, didFailProvisionalNavigation: WKNavigation!, withError: Error) { }
//After the webpage is loaded, assign the data in WebViewModel class
public func webView(_ web: WKWebView, didFinish: WKNavigation!) {
self.viewModel.pageTitle = web.title!
self.viewModel.link = web.url?.absoluteString as! String
self.viewModel.didFinishLoading = true
}
public func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) { }
public func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
decisionHandler(.allow)
}
}
}
此代碼可以按如下方式使用:
struct ContentView: View {
var body: some View {
//Pass the url to the SafariWebView struct.
SafariWebView(mesgURL: "https://stackoverflow.com/")
}
}
struct SafariWebView: View {
@ObservedObject var model: WebViewModel
init(mesgURL: String) {
//Assign the url to the model and initialise the model
self.model = WebViewModel(link: mesgURL)
}
var body: some View {
//Create the WebView with the model
SwiftUIWebView(viewModel: model)
}
}
所以現在我們有了這些知識,重新創建方便的 safari 預覽相對容易。
為此,請確保將@State private var showSafari = false
(當您要顯示預覽時將切換)添加到將調用預覽的視圖中。
同時添加.popover(isPresented: self.$showSafari) {...
來顯示預覽
struct ContentView: View {
@State private var showSafari = false
var body: some View {
VStack(alignment: .leading) {
Text("Press me to get a preview")
.padding()
}
.onLongPressGesture {
//Toggle to showSafari preview
self.showSafari.toggle()
}//if showSafari is true, create a popover
.popover(isPresented: self.$showSafari) {
//The view inside the popover is made of the SafariPreview
SafariPreview(mesgURL: "https://duckduckgo.com/")
}
}
}
現在SafariPreview struct
將如下所示:
struct SafariPreview: View {
@ObservedObject var model: WebViewModel
init(mesgURL: String) {
self.model = WebViewModel(link: mesgURL)
}
var body: some View {
//Create a VStack that contains the buttons in a preview as well a the webpage itself
VStack {
HStack(alignment: .center) {
Spacer()
Spacer()
//The title of the webpage
Text(self.model.didFinishLoading ? self.model.pageTitle : "")
Spacer()
//The "Open with Safari" button on the top right side of the preview
Button(action: {
if let url = URL(string: self.model.link) {
NSWorkspace.shared.open(url)
}
}) {
Text("Open with Safari")
}
}
//The webpage itself
SwiftUIWebView(viewModel: model)
}.frame(width: 800, height: 450, alignment: .bottom)
.padding(5.0)
}
}
結果如下所示:
Chiel的回答很棒!
但是,可能有人在沒有完整瀏覽器功能的情況下搜索 html 渲染器視圖
適用於 MACOS
import SwiftUI
import WebKit
struct WebView: View {
@Binding var html: String
var body: some View {
WebViewWrapper(html: html)
}
}
struct WebViewWrapper: NSViewRepresentable {
let html: String
func makeNSView(context: Context) -> WKWebView {
return WKWebView()
}
func updateNSView(_ nsView: WKWebView, context: Context) {
nsView.loadHTMLString(html, baseURL: nil)
}
}
用法:
@State var text = "<html><body><h1>Hello World</h1><p><strong>hell</strong> yeah!</p></body></html>"
//......
TextField("", text: $text)
Divider()
WebView(html: $text)
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
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