I fixed problem.
Before when I used UIWebView, I replaced images in the source of page to this structure:
let imageFixedString = "file://" + Bundle.main.path(forResource: imageLink, ofType: nil)
bodyPage.replacingOccurrences(of: imageLink, with: imageFixedString)
webView.loadHTMLString(bodyPage, baseURL: nil)
But when I move to WKWebview, is stoped work.
In my situation, no need replace image address, but need set baseURL:
let baseUrlWk = Bundle.main.bundleURL
webView.loadHTMLString(bodyPage, baseURL: baseUrlWk)