The current situation is I have an initial view of login (A) and a second view when (B) has already logged in.
I want that when I open the application and the user has the values stored in the UserDefaults.standard, check that the values match those of the server and if they are correct enter the B view.
The problem is that alamofire is asynchronous, and the A-view is loaded before you get the answer.
SceneDelegate.swift
First attempt before we knew that alamofire was launched asynchronously
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
//Code to open default viewA
...
//Code to try open viewB
let logAcepted = openViewB(url, param)
if logAcepted //<-- this execute before query in func before
{
if let windowScene = scene as? UIWindowScene
{
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: Principal())
self.window = window
window.makeKeyAndVisible()
}
}
}
I have seen that there is a completion field that could help to solve this problem but I think that I have not applied it well.
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
//Code to open default viewA
...
//Code to try open viewB
openViewB(url, param, completion: {logAcepted in
if logAcepted
{
if let windowScene = scene as? UIWindowScene
{
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: Principal())
self.window = window
window.makeKeyAndVisible()
}
}
})
}
How can I make this function run synconically? or have the main code wait for the result of the query?
func openViewB(_ url: String, _ param: [String : String], completion : @escaping (Bool)->()) {
var ret : Bool = false
AF.request(url, parameters: param).responseJSON {response in
switch response.result {
case .success(let value):
if let JSON = value as? [String: Any]
{
let status = JSON["status"] as! String
switch status
{
case "Ok":
ret = true
completion(ret)
default:
ret = false
completion(ret)
}
}
case .failure( _):
ret = false
completion(ret)
}
}
}
I found a lot of related information but none that works in this version of swift/alamofire
Don't wait, never wait.
Your openViewB method has already a completion handler, use it.
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
//Code to open default viewA
...
//Code to try open viewB
openViewB(url, param) { logAccepted in
if logAccepted
{
if let windowScene = scene as? UIWindowScene
{
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: Principal())
self.window = window
window.makeKeyAndVisible()
}
}
}
}