How to check validity of URL in Swift?

Question

Trying to make an app launch the default browser to a URL, but only if the URL entered is valid, otherwise it displays a message saying the URL is invalid.

How would

Answer 1

This isn't a regex approach, but it is a naive one that works well for making sure there is a host and an extension if you want a simple and inexpensive approach:

extension String {
    var isValidUrlNaive: Bool {
        var domain = self
        guard domain.count > 2 else {return false}
        guard domain.trim().split(" ").count == 1 else {return false}
        if self.containsString("?") {
            var parts = self.splitWithMax("?", maxSplit: 1)
            domain = parts[0]
        }
        return domain.split(".").count > 1
    }
}

Use this only if you want a quick way to check on the client side and you have server logic that will do a more rigorous check before saving the data.