我正在尝试获得我的 WKWebview 的正确高度和宽度内容，将 webview 容器高度设置为 webview 内容。
我已经尝试了很多关于堆栈溢出的解决方案。
使用这段代码，容器具有正确的高度，但是 webview 的宽度太大(好像 webview 被缩放了一样)
override func viewDidLoad() {
let webConfiguration = WKWebViewConfiguration()
let customFrame = CGRect.init(origin: CGPoint.zero, size: CGSize.init(width: 0.0, height: self.viewForWebview.frame.size.height))
self.webView = WKWebView (frame: customFrame , configuration: webConfiguration)
webView.translatesAutoresizingMaskIntoConstraints = false
self.viewForWebview.addSubview(webView)
NSLayoutConstraint.activate([
self.webView.topAnchor.constraint(equalTo: self.viewForWebview.topAnchor),
self.webView.bottomAnchor.constraint(equalTo: self.viewForWebview.bottomAnchor),
self.webView.leadingAnchor.constraint(equalTo: self.viewForWebview.leadingAnchor),
self.webView.trailingAnchor.constraint(equalTo: self.viewForWebview.trailingAnchor)
])
webView.uiDelegate = self
webView.navigationDelegate = self
webView.scrollView.isScrollEnabled = false
let bodyHtml = "<html><head><meta name=\"viewport\" content=\"initial-scale=1.0\" />" + htmlString + "</body></html>";
webView.loadHTMLString(bodyHtml, baseURL: Bundle.main.resourceURL)
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
self.heightWebviewConstraint.constant = self.webView.scrollView.contentSize.height
self.view.setNeedsLayout()
self.view.setNeedsUpdateConstraints()
}
改为添加 <head>标签，我也尝试使用 evaluateJavaScript , 但在这种情况下，高度的容器太大，而 webview 的宽度太大。
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
self.webView.evaluateJavaScript("document.readyState", completionHandler: { (complete, error) in
if complete != nil {
self.webView.evaluateJavaScript("document.body.offsetHeight", completionHandler: { (height, error) in
self.heightWebviewConstraint.constant = height as! CGFloat
self.view.setNeedsLayout()
self.view.setNeedsUpdateConstraints()
})
}
})
}
我还尝试添加特定的 css 样式(没有 viewport 和没有 evaluateJavaScript )，在这种情况下，webview 的宽度没问题，但高度的容器太小(我的 webview 在顶部和底部被裁剪)。
let bodyHtml = "<html><head> <style> img { width:auto; height:auto; max-width:100%; </style></head><body>" + htmlString + "</body></html>"
我迷失了所有这些解决方案。
最佳答案
我认为您实际上非常接近那里的解决方案。我遇到过类似的问题，并设法通过评估 javascript 来解决它。我们的实现有点不同，因为我们使用带有嵌套 WkWebViews 的堆栈 View 作为排列的 subview 。但我可以分享我们的代码(去除了堆栈 View 部分)，您可以自己尝试一下。
func addAndLoadWebView(with url: URL) {
let wkWebView = WKWebView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 100))
wkWebView.translatesAutoresizingMaskIntoConstraints = false
wkWebView.navigationDelegate = self
wkWebView.scrollView.isScrollEnabled = false
wkWebView.scrollView.bounces = false
wkWebView.scrollView.bouncesZoom = false
wkWebView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.view.addSubview(wkWebView)
wkWebView.load(URLRequest(url: url))
}
@available(iOS 12.0, *)
func asyncGetHTMLHeight(_ webview: WKWebView, completion: @escaping (CGFloat) -> Void) {
webview.evaluateJavaScript("document.body.offsetHeight") { (result, _) in
guard let result = result as? CGFloat else {
completion(0.0)
return
}
completion(result)
}
}
@available(iOS 12.0, *)
func compatibleMeasureImageContent(with webview: WKWebView) {
webview.evaluateJavaScript("document.body.firstChild.offsetHeight") { (result, _) in
guard let result = result as? CGFloat else {
return
}
var height = result
webview.evaluateJavaScript("document.body.firstChild.width") { (result, _) in
guard let width = result as? CGFloat else {
return
}
// do something with width and height here
// in our case images come 1 by one since our html is delivered in parts. You might have to check each image tag for its height for this calculation to work.
}
}
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
self.asyncGetHTMLHeight(webView, completion: { newHeight in
webView.frame.size.height = newHeight
webView.removeConstraints(webView.constraints)
webView.heightAnchor.constraint(equalToConstant: newHeight).isActive = true
})
}
关于ios - WKWebview的container content height如何调整到webview的内容？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54326329/