我需要帮助根据 WKWebKitView 内容高度更新 UITableViewCell 的高度。
我已经编写了基于
document.body.offsetHeight所以我使用了以下方法。
extension PDDescriptionCell: WKNavigationDelegate {
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
self.summaryHeight?.constant = 0
self.contentView.layoutIfNeeded()
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
self.summaryHeight?.constant = webView.scrollView.contentSize.height
if let tableView = self.superview as? UITableView {
tableView.beginUpdates()
tableView.endUpdates()
}
self.contentView.layoutIfNeeded()
}
}
问题是 PDDescriptionCell 是具有其他 tableViewCells 的 ProductDetail UITableViewController 的一部分，并且此 PDDescriptionCell 位于第 3 行。一旦我打开 ProductDetail 并滚动到 PDDescriptionCell 的第 3 行，高度就与第 3 行相同在xib文件中设置。但是，tableView 已更新。但 PDDescriptionCell 的正确高度不会更新。如果我向上滚动到第 1 行，然后返回到第 3 行，则会更新 PDDescriptionCell 的正确高度。
当第 3 行位于屏幕本身上时，如何确保通过这种查找高度的方式更新 PDDescriptionCell 的第 3 行的高度？
PDDescriptionCell 的完整代码：
class PDDescriptionCell: UITableViewCell {
var product: ProductModel? {
didSet {
if let product = product {
print(product.summary)
loadContent(product.summary)
}
}
}
IBOutlet weak var summaryView: WKWebView!
IBOutlet weak var summaryHeight: NSLayoutConstraint!
private let configuration = WKWebViewConfiguration()
override func awakeFromNib() {
super.awakeFromNib()
print("awake from nib")
contentView.backgroundColor = .background1
summaryView.navigationDelegate = self
let preference = WKWebpagePreferences()
preference.preferredContentMode = .mobile
preference.allowsContentJavaScript = true
let configuration = WKWebViewConfiguration()
configuration.defaultWebpagePreferences = preference
if let product = product {
_ = WKWebViewConfiguration()
print("HTML string is loaded")
self.summaryView.loadHTMLString(product.summary, baseURL: nil)
self.loadContent(product.summary)
}
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
private func loadContent(_ content: String) {
let styledHTML = """
<html>
<head>
<style> body { font-size: 30px; /\* Change the font size for the body as needed \*/ font-family: -apple-system; /\* Use the system font \*/ } table { width: 100%; border-collapse: collapse; } th, td { border: 1px solid #dddddd; text-align: left; padding: 8px; font-size: 20px; /\* Change the font size for table cells as needed \*/ } th { background-color: #f2f2f2; } img { width: 100%; /\* Set the width of images to 100% \*/ height: auto; /\* Set the height of images to auto to maintain aspect ratio \*/ margin-bottom: 50px; /\* Add space below each image \*/ } .semibold { font-weight: 600; /\* Set font weight to semibold \*/ } </style>
<script type="text/javascript"> window.onload = function() { var body = document.body; var html = document.documentElement; var height = Math.max(body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight); window.webkit.messageHandlers.iOS.postMessage(height); } </script>
</head>
<body>
\(content)
</body>
</html>
"""
// Load the styled HTML content into the WKWebView
self.summaryView.loadHTMLString(styledHTML, baseURL: nil)
}
}
extension PDDescriptionCell: WKNavigationDelegate {
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
self.summaryHeight?.constant = 0
self.contentView.layoutIfNeeded()
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
self.summaryHeight?.constant = webView.scrollView.contentSize.height
if let tableView = self.superview as? UITableView {
tableView.beginUpdates()
tableView.endUpdates()
}
self.contentView.layoutIfNeeded()
}
}
我尝试使用
evaluateJavaScript("document.readyState")evaluateJavaScript("document.body.scrollHeight")如果网页视图解决方案不起作用，请尝试这种替代方法。
可以使用带有属性文本的标签来代替 webView。
用标签替换webView
将
self.summaryView.loadHTMLString(styledHTML, baseURL: nil)if let data = styledHTML.data(using: .utf8),
let attributedText = try? NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil) {
attributedTextLabel.attributedText = attributedText
}