Scroll all the way at the bottom of WeatherController and we find webView:runJavaScriptAlertPanelWithMessage:
If you've done any WebKit work you know what this is: One of the WKUIDelegate's methods! 👌👌👌 (https://developer.apple.com/documentation/webkit/webuidelegate/1387807-webview)
If you've done any WebKit work you know what this is: One of the WKUIDelegate's methods! 👌👌👌 (https://developer.apple.com/documentation/webkit/webuidelegate/1387807-webview)
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Someone forgot to remove a debug print in the shipping binary! at some point this was a web app, running in a UIWebView... in fact Ken Kocienda and Richard Williamson mention this in their CHM interview https://www.youtube.com/watch?v=xImAMe32Itg