SwiftUI WKWebView 内容高度问题
一个星期以来，我一直在解决这个问题，我对WKWebViewUIViewRepresentable进行了自定义
struct Webview : UIViewRepresentable {
var webview: WKWebView?
init() {
self.webview = WKWebView()
}
class Coordinator: NSObject, WKNavigationDelegate {
var parent: Webview
init(_ parent: Webview) {
self.parent = parent
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
print("Loading finished -- Delegate")
webView.evaluateJavaScript("document.documentElement.scrollHeight", completionHandler: { (height, error) in
print(height)
webView.bounds.size.height = height as! CGFloat
})
}
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIView(context: Context) -> WKWebView {
return webview!
}
func updateUIView(_ uiView: WKWebView, context: Context) {
uiView.navigationDelegate = context.coordinator
let htmlStart = "<HTML><HEAD><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, shrink-to-fit=no\"></HEAD><BODY>"
let htmlEnd = "</BODY></HTML>"
let dummy_html = """
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ut venenatis risus. Fusce eget orci quis odio lobortis hendrerit. Vivamus in sollicitudin arcu. Integer nisi eros, hendrerit eget mollis et, fringilla et libero. Duis tempor interdum velit. Curabitur</p>
<p>ullamcorper, nulla nec elementum sagittis, diam odio tempus erat, at egestas nibh dui nec purus. Suspendisse at risus nibh. Mauris lacinia rutrum sapien non faucibus. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec interdum enim et augue suscipit, vitae mollis enim maximus.</p>
<p>Fusce et convallis ligula. Ut rutrum ipsum laoreet turpis sodales, nec gravida nisi molestie. Ut convallis aliquet metus, sit amet vestibulum risus dictum mattis. Sed nec leo vel mauris pharetra ornare quis non lorem. Aliquam sed justo</p>
"""
let htmlString = "\(htmlStart)\(dummy_html)\(htmlEnd)"
uiView.loadHTMLString(htmlString, baseURL: nil)
}
}
它是这样呈现的
这里的问题是 webview 缺少高度。它不会出现在我的视图中，除非我添加一个硬编码frame值来截断我的内容。
Webview()
.frame(height:300)
我几乎遇到了类似的问题，但没有帮助：/
Asp*_*eri 28
它ScrollView在 SwiftUI 中令人困惑，它期望提前知道内容大小，而UIWebViewinternalUIScrollView试图从父视图中获取大小......循环。
所以这是可能的方法.. 将确定的大小从 web 视图传递到 SwiftUI 世界，因此没有使用硬编码并且ScrollView表现得像具有平面内容。
在结果的第一个演示中，正如我所理解和模拟的......
这是演示的完整模块代码。在 Xcode 11.2 / iOS 13.2 上测试和工作。
import SwiftUI
import WebKit
struct Webview : UIViewRepresentable {
@Binding var dynamicHeight: CGFloat
var webview: WKWebView = WKWebView()
class Coordinator: NSObject, WKNavigationDelegate {
var parent: Webview
init(_ parent: Webview) {
self.parent = parent
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.evaluateJavaScript("document.documentElement.scrollHeight", completionHandler: { (height, error) in
DispatchQueue.main.async {
self.parent.dynamicHeight = height as! CGFloat
}
})
}
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIView(context: Context) -> WKWebView {
webview.scrollView.bounces = false
webview.navigationDelegate = context.coordinator
let htmlStart = "<HTML><HEAD><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, shrink-to-fit=no\"></HEAD><BODY>"
let htmlEnd = "</BODY></HTML>"
let dummy_html = """
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ut venenatis risus. Fusce eget orci quis odio lobortis hendrerit. Vivamus in sollicitudin arcu. Integer nisi eros, hendrerit eget mollis et, fringilla et libero. Duis tempor interdum velit. Curabitur</p>
<p>ullamcorper, nulla nec elementum sagittis, diam odio tempus erat, at egestas nibh dui nec purus. Suspendisse at risus nibh. Mauris lacinia rutrum sapien non faucibus. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec interdum enim et augue suscipit, vitae mollis enim maximus.</p>
<p>Fusce et convallis ligula. Ut rutrum ipsum laoreet turpis sodales, nec gravida nisi molestie. Ut convallis aliquet metus, sit amet vestibulum risus dictum mattis. Sed nec leo vel mauris pharetra ornare quis non lorem. Aliquam sed justo</p>
"""
let htmlString = "\(htmlStart)\(dummy_html)\(htmlEnd)"
webview.loadHTMLString(htmlString, baseURL: nil)
return webview
}
func updateUIView(_ uiView: WKWebView, context: Context) {
}
}
struct TestWebViewInScrollView: View {
@State private var webViewHeight: CGFloat = .zero
var body: some View {
ScrollView {
VStack {
Image(systemName: "doc")
.resizable()
.scaledToFit()
.frame(height: 300)
Divider()
Webview(dynamicHeight: $webViewHeight)
.padding(.horizontal)
.frame(height: webViewHeight)
}
}
}
}
struct TestWebViewInScrollView_Previews: PreviewProvider {
static var previews: some View {
TestWebViewInScrollView()
}
}
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