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daniloc/WebViewCSSExtension.swift

Created January 23, 2020 15:30
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Revisions

  1. daniloc revised this gist Jan 23, 2020. No changes.
  2. daniloc revised this gist Jan 23, 2020. No changes.
  3. daniloc revised this gist Jan 23, 2020. No changes.
  4. daniloc created this gist Jan 23, 2020.
    26 changes: 26 additions & 0 deletions WebViewCSSExtension.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,26 @@
    extension WKWebView {

    //via https://stackoverflow.com/a/53706678
    //and https://stackoverflow.com/a/53141055

    func applyStylesheet() {
    guard
    let path = Bundle.main.path(forResource: "style", ofType: "css"), //load style.css from your app bundle
    let cssString = try? String(contentsOfFile: path).components(separatedBy: .newlines).joined()
    else {
    return
    }

    let source = """
    var style = document.createElement('style');
    style.innerHTML = '\(cssString)';
    document.head.appendChild(style);
    """

    let userScript = WKUserScript(source: source,
    injectionTime: .atDocumentEnd,
    forMainFrameOnly: true)

    self.configuration.userContentController.addUserScript(userScript)
    }
    }