WebViewAuthenticator and UIKit

[BoikoArtem30091994]

• I've searched past issues and I couldn't find reference to this.
• I've checked out all provided Examples.

Hello. Can't embed swiftagram usage in UIKit. Should the library work not in swift ui or is it not available at the moment?

[sbertix]

Of course you can use it with UIKit 😊.

For instance, for logging in, you can rely on LoginViewController from the Followers example, or just build your own custom one.

import UIKit
import WebKit

import Swiftagram
import SwiftagramCrypto

class LoginViewController: UIViewController {
    /// The completion handler.
    var completion: ((Secret) -> Void)?
    /// The web view.
    var webView: WKWebView? {
        didSet {
            guard let webView = webView else { return }
            webView.frame = view.frame
            view.addSubview(webView)
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Authenticate.
        WebViewAuthenticator(storage: KeychainStorage()) { self.webView = $0 }
            .authenticate { [weak self] in
                switch $0 {
                case .failure(let error): print(error.localizedDescription)
                case .success(let secret):
                    self?.completion?(secret)
                    self?.dismiss(animated: true, completion: nil)
                }
            }
    }
}

[BoikoArtem30091994]

I try this code to implement in my project. But WKWebView does not load Instagram login, you can try to create the project and set up your own login. It's not working

[sbertix]

What version of Xcode are you on?
What Swift toolchain version are you using?
For what device are you testing it?
Cause I feel like that might be the issue there, since it does work on my part 🥺

If it gives you an error, do you mind pasting it here?
If it doesn't, would you mind showing your implementation a bit more?

[BoikoArtem30091994]

Xcode 11.5. It seems to me that the problem is in the WebViewAuthenticator, because at first I built my project with UIkit and an example from Followers, and it does not work, and then using swift UI everything is fine.
No mistake just white WKWebView. If I simply create a request with example url, then everything works fine, that is the problem is not in wkwebview.

[sbertix]

I wrote a new UIKit project, added a LoginViewController like I defined it above, and tested it in the simulator, and it still works for me 😢
I'll check your code above to see if there's something missing there.

[BoikoArtem30091994]

I wrote a new UIKit project, added a LoginViewController like I defined it above, and tested it in the simulator, and it still works for me 😢
I'll check your code above to see if there's something missing there.

My implementation slightly different. I will try according to your option. Thank you for your quick answer. I will give feedback.

[BoikoArtem30091994]

It's working. Thank you for your support.

[sbertix]

When you reassign the WKWebView in row 41, you're not adding the new one in the view hierarchy, so it won't display.
Basically everything between 21 and 40 is useless cause it's scrapped once you assign a new webView in 41.

I'll add auto layout constraints to LoginViewController in Followers, so people can just copy and paste it, but for now you can just do:

import UIKit
import WebKit

import Swiftagram
import SwiftagramCrypto

class LoginViewController: UIViewController {
    /// The completion handler.
    var completion: ((Secret) -> Void)?
    /// The web view.
    var webView: WKWebView? {
        didSet {
            guard let webView = webView else { return }
            webView.frame = view.frame
            webView.translatesAutoresizingMaskIntoConstraints = false
            view.addSubview(webView)
            // Add constraints.
            NSLayoutConstraint.activate([
                webView.topAnchor.constraint(equalTo: webView.topAnchor),
                webView.leadingAnchor.constraint(equalTo: webView.leadingAnchor),
                webView.trailingAnchor.constraint(equalTo: webView.trailingAnchor),
                webView.bottomAnchor.constraint(equalTo: webView.bottomAnchor)
            ])
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Authenticate.
        WebViewAuthenticator(storage: KeychainStorage()) { self.webView = $0 }
            .authenticate { [weak self] in
                switch $0 {
                case .failure(let error): print(error.localizedDescription)
                case .success(let secret):
                    self?.completion?(secret)
                    self?.dismiss(animated: true, completion: nil)
                }
            }
    }
}