Книги
Swift
Розділ 11. HTML та веб
Завантаження веб-сторінки

Swift:
Завантаження веб-сторінки

Що і Чому?

Downloading a web page means fetching the HTML content of a web page from the Internet. Programmers do it to extract data, interact with web services, or test their sites.

How to:

Як це зробити:

Using URLSession, we can get content easily.

import Foundation

let url = URL(string: "https://example.com")!
let task = URLSession.shared.dataTask(with: url) { data, response, error in
    if let error = error {
        print("Error downloading webpage: \(error)")
        return
    }
    if let data = data, let webpageContent = String(data: data, encoding: .utf8) {
        print(webpageContent)
    }
}

task.resume()

Expect something like this as output (truncated for brevity):

<!doctype html>
<html>
<head>
    <title>Example Domain</title>
...
</html>

Deep Dive:

Детально:

Back in the day, web pages were simpler, and we used libraries like NSURLConnection. Now, URLSession is the go-to in Swift, more powerful and flexible.

There are other ways to download content, like using WebKit for JavaScript-heavy pages, or third-party libraries such as Alamofire for complex networking tasks.

Implementation-wise, always remember to run network calls on background threads to keep your UI snappy. Handle Data, URLResponse, and Error correctly to manage edge cases. Consider also HTTP status codes and MIME types to process data right.

See Also:

Додаткові матеріали:

Аналіз HTML