accept a self-signed SSL certificate

self-signed-SSL.swift

import UIKit

class NSURLSessionPinningDelegate: NSObject, URLSessionDelegate {
    
    func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Swift.Void) {

        if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
            if let trust = challenge.protectionSpace.serverTrust,
               let pem = Bundle.main.path(forResource: "https", ofType: "cer"),
               let data = NSData(contentsOfFile: pem),
               let cert = SecCertificateCreateWithData(nil, data) {
                let certs = [cert]
                SecTrustSetAnchorCertificates(trust, certs as CFArray)
                
                completionHandler(URLSession.AuthChallengeDisposition.useCredential, URLCredential(trust: trust))
                return
            }
        }
        
        // Pinning failed
        completionHandler(URLSession.AuthChallengeDisposition.cancelAuthenticationChallenge, nil)
    }
}

var url = URL(string: "https://test.com/")
let operationQueue = OperationQueue()
let config = URLSessionConfiguration.ephemeral
let session = URLSession(configuration: config, delegate: NSURLSessionPinningDelegate(), delegateQueue: operationQueue)
session.dataTask(with: url!) { (data, urlResponse, error) in
    if let error = error {
        print(error)
    }
    if let urlResponse = urlResponse {
        print(urlResponse)
    }
    
}.resume()

import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true