How can nested text within HTML tags on a webpage be retrieved using Swift?

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The nested text within HTML tags on a webpage can be retrieved using Swift by using a web scraping technique. Here's an example code snippet that demonstrates how it can be done:

import UIKit

let urlString = "https://example.com"
guard let url = URL(string: urlString) else {
    fatalError("Invalid URL")
}

let request = URLRequest(url: url)
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
    guard let data = data else {
        fatalError("Error retrieving data")
    }

    guard let htmlString = String(data: data, encoding: .utf8) else {
        fatalError("Error converting data to HTML string")
    }

    let regex = try! NSRegularExpression(pattern: "<.*?>(.*?)<.*?>", options: [.dotMatchesLineSeparators])
    let matches = regex.matches(in: htmlString, range: NSRange(htmlString.startIndex..., in: htmlString))

    let nestedTexts = matches.map {
        String(htmlString[Range($0.range(at: 1), in: htmlString)!])
    }

    print(nestedTexts)
}

task.resume()

In this code, we first create a URL object from the URL string, and then create a URLRequest object with it. We then use URLSession to retrieve the HTML data from the URL, and convert it to a string.

Next, we use NSRegularExpression to search for any patterns that match HTML tags, and retrieve the nested text within them. The matched strings are then stored in an array.

Finally, we print out the array to see the nested text we retrieved from the HTML. Note that this is just a basic example, and the regular expression used may need to be modified depending on the structure of the HTML being parsed.