How can we wait for HTTP requests to finish?

Question

Using several answers on SO, we have managed to write and execute a basic HTTP request:

import Foundation

let url:URL = URL(string: \"http://jsonplaceholder         


        

Answer 1

The most straight-forward (and built-in) way is probably to use a DispatchSemaphore:

<...>

let sem = DispatchSemaphore(value: 0)

let task = session.dataTask(with: request as URLRequest) {
    (data, response, error) in

    <...>
    sem.signal()
}

task.resume()
sem.wait()