Unable to reload/redisplay PDF in WkWebView; but RTF apparently works - pdf

Question

Scenario: TabbedUI with Tab #1 being a WkWebView displaying a PDF of general information (Info).
Problem: When I exit tab #1 (info) for another tab (ex. search), and return....I get an empty PDF with the following error message in the console:
Could not signal service com.apple.WebKit.WebContent: 113: Could not
find specified service
However this doesn't happen when I use a standard .rtf (Rich Text Format) file.
Here's my code:
import SwiftUI
import WebKit
struct IntroSwiftUI: View {
var body: some View {
Webview()
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
.edgesIgnoringSafeArea(.bottom)
}
}
// =====================================================================================================
struct Webview: UIViewRepresentable {
func makeUIView(context: Context) -> WKWebView {
guard let url = Bundle.main.url(forResource: "ReadMe", withExtension: "pdf") else {
print("Inside Webview: unable to reload ReadMe.")
return WKWebView()
}
let request = URLRequest(url: url)
let wkWebview = WKWebView()
wkWebview.load(request)
wkWebview.scrollView.bounces = false
return wkWebview
}
func updateUIView(_ uiView: WKWebView, context: Context) {
}
}
I just want a static PDF to be available for viewing whenever the user which to read some documentation (with embedded images). But apparently it tries to rebuild and gets lost.
Do I need to do something 'special' with the PDF, like release it when exiting & re-create it upon return? That seems totally inefficient.

Answer 1

Per suggestion,
Use the PDFView paradigm.
Here is my revised (correct) code for PDF viewing:
import SwiftUI
import UIKit
import PDFKit
struct PDFKitRepresentedView: UIViewRepresentable {
let url: URL
init(_ url: URL) {
self.url = url
}
func makeUIView(context: UIViewRepresentableContext<PDFKitRepresentedView>) -> PDFKitRepresentedView.UIViewType {
// Create a `PDFView` and set its `PDFDocument`.
let pdfView = PDFView()
pdfView.document = PDFDocument(url: self.url)
return pdfView
}
func updateUIView(_ uiView: UIView, context: UIViewRepresentableContext<PDFKitRepresentedView>) {
// Update the view.
}
}
struct PDFKitView: View {
var url: URL
var body: some View {
PDFKitRepresentedView(url)
}
}
// =====================================================================================================
struct IntroSwiftUI: View {
var body: some View {
if let documentURL = Bundle.main.url(forResource: "ReadMe", withExtension: "pdf") {
VStack(alignment: .center) {
Text("Introduction")
.font(.title3)
.fontWeight(Font.Weight.medium)
PDFKitView(url: documentURL)
}
} else {
Text("Sorry, No PDF")
}
}
}