Check if an URL has got http:// prefix

Question

In my application, when the user add an object, can also add a link for this object and then the link can be opened in a webView.
I tried to save a link without http://

Answer 1

Better to use the scheme property on the URL object:

extension URL {
    var isHTTPScheme: Bool {
        return scheme?.lowercased().contains("http") == true // or hasPrefix
    }
}

Example usage:

let myURL = URL(string: "https://stackoverflow.com/a/48835119/1032372")!
if myURL.isHTTPScheme {
    // handle, e.g. open in-app browser:            
    present(SFSafariViewController(url: url), animated: true)
} else if UIApplication.shared.canOpenURL(myURL) {
    UIApplication.shared.openURL(myURL)
}