Get the value of URL Parameters in WKWebView and create new URL - ios

Question

I'm trying to get the current URL of the WKWebView, search/copy one value out of it, and create a new URL.
I use Swift and have this an URL like that https://example.org/bundle-572974a2.html and try to get the following value 572974a2.
My intention is to create a new URL with that value. The numbers can change from time to time.
I use this code to get the current WKWebView URL. I think I have to convert this to a string first.
let oldURL = webView.url
And I use this code to create my new URL.
var components = URLComponents()
components.scheme = "https"
components.host = "new-example.org"
components.path = "/g"
components.queryItems = [
URLQueryItem(name: "newbundle", value: "XXXXXXXX")
]
let newURL = components.url
How can I change/paste the value: "XXXXXXXX" with the value 572974a2 of the old URL?

Answer 1

Some simple URL manipulation and string handling will get you the number from the old URL:
let oldURL = URL(string: "https://example.org/bundle-572974a2.html")! // An example
let name = oldURL.deletingPathExtension().lastPathComponent // bundle-572974a2
let number = name.dropFirst(7) // remove "bundle-"
This assumes the number will always be preceded by "bundle-" (or any seven-letter sequence really. If that can vary then the use of dropFirst(7) will need to be replaced with code that can handle strings like "bundle-572974a2" and remove the part you don't want.
Then building the new URL becomes:
var components = URLComponents()
components.scheme = "https"
components.host = "new-example.org"
components.path = "/g"
components.queryItems = [
URLQueryItem(name: "newbundle", value: String(number))
]
let newURL = components.url
In a case where you might have both a prefix and a suffix you need to remove, the following would be one way to remove them. This code assumes there will be a prefix to remove if there is a suffix to remove. If there is a suffix and no prefix to remove then this code gives the wrong result.
var number = url.deletingPathExtension().lastPathComponent
if let hyphen = number.firstIndex(of: "-") {
number = String(number[number.index(after: hyphen)...])
}
if let hyphen = number.lastIndex(of: "-") {
number = String(number[..<hyphen])
}
P.S. String manipulation in Swift is a pain.