Ios 如何调整WKWebview'；容器内容相对于webview内容的高度？
我正在尝试获取我的Ios 如何调整WKWebview'；容器内容相对于webview内容的高度？,ios,swift,webview,height,wkwebview,Ios,Swift,Webview,Height,Wkwebview,我正在尝试获取我的WKWebview内容的正确高度和宽度，以将webview容器高度设置为webview内容。 我已经尝试了很多解决堆栈溢出的方法 使用此代码，容器具有正确的高度，但webview的宽度太大（好像webview被缩放） 我还尝试添加特定的css样式（没有视口和evaluateJavaScript），在这种情况下，webview的宽度可以，但高度的容器太小（我的webview在顶部和底部被裁剪） let bodyHtml=“img{宽度：自动；高度：自动；最大宽度：100%；”+h
WKWebview视口evaluateJavaScriptlet bodyHtml=“img{宽度：自动；高度：自动；最大宽度：100%；”+htmlString+“”
我对所有这些解决方案都迷惑不解。我认为您实际上离解决方案很近。我曾经遇到过类似的问题，并设法通过评估javascript解决了它。我们的实现有点不同，因为我们使用带有嵌套WKWebView的stackview作为排列子视图。但我可以分享我们的代码（去掉stackview部件）您可以自己尝试
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
})
}
不适用于我，新结果：高度的容器太大，web视图的宽度太小：（你是在严格加载html还是PDF？意识到我们实际上在代码注入之前添加了一些html规范化。不确定它是否有帮助，但也可以将其链接起来。html仅使用html图像中的标记有点棘手，你可能需要编写一些javascript来检查每个图像标记。实际上，我们对图像的高度计算是不同的。
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()
})
}
})
}
let bodyHtml = "<html><head> <style> img { width:auto; height:auto; max-width:100%; </style></head><body>" + htmlString + "</body></html>"
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
})
}