URL validation in Swift

Question

In my Swift iOS project, I want to check whether is the valid url or not before requesting to server. I did earlier in Objective C code to check many elements like presence of www, http, https, :, etc to validate whether the right url or not. Do we have anything similar in Swift code?

I am expecting like this Obj C method.

 - (BOOL) validateUrl: (NSString *) candidate {
    NSString *urlRegEx =
    @"(http|https)://((\\w)*|([0-9]*)|([-|_])*)+([\\.|/]((\\w)*|([0-9]*)|([-|_])*))+";
    NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", urlRegEx]; 
    return [urlTest evaluateWithObject:candidate];
}

Please suggest.

Answer 1

Swift 4.x

This Covers all types of validation like Subdomain, with or without HTTP / HTTPS

func isValidUrl(url: String) -> Bool {
    let urlRegEx = "^(https?://)?(www\\.)?([-a-z0-9]{1,63}\\.)*?[a-z0-9][-a-z0-9]{0,61}[a-z0-9]\\.[a-z]{2,6}(/[-\\w@\\+\\.~#\\?&/=%]*)?$"
    let urlTest = NSPredicate(format:"SELF MATCHES %@", urlRegEx)
    let result = urlTest.evaluate(with: url)
    return result
}

Hope this works for you.