How to handle sessions with QuickBlox in iOS - ios

Question

I am using Quickblox example writing in Swift for chat app. It uses QMServices.
Questions:
1) is there any approach for user login in iOS application with some session_token generated in any cloud backend ?
2) please help - how to renew user sessions in right way, I always get 422 error (validation error) multiple times (
In app using QuickBlox for iOS I try to login user in appdelegate:
if Storage.sharedInstance.currentUser != nil {
if !ServicesManager.instance().isAuthorized() {
let user =Storage.sharedInstance.currentUser
ServicesManager.instance().loginOrSignUp(user) {
[unowned self] success, error in
if (success) {
self.openMainScreen()
}
}
} else {
openMainScreen()
}
}
And loginOrSignUp function is:
func loginOrSignUp(user: QBUUser!, completion: ((success:Bool, errorMessage: String!) -> Void)!) {
self.logInWithUser(user) { (success:Bool, errorMessage: String!) -> Void in
if (success) {
Storage.sharedInstance.currentUser = self.currentUser()
completion(success: success, errorMessage: errorMessage)
} else {
self.authService.signUpAndLoginWithUser(user, completion: { (response: QBResponse!, user: QBUUser!) -> Void in
if user != nil {
Storage.sharedInstance.currentUser = self.currentUser()
completion(success: true, errorMessage: errorMessage)
} else {
completion(success: false, errorMessage: response.error?.error?.localizedDescription)
}
})
}
}
}
For example using Parse cloud code I can call function from cloud code:
Parse.Cloud.define("signUp", function(req, res) {
var phoneNumber = req.params.phoneNumber;
Parse.Cloud.useMasterKey();
var query = new Parse.Query(Parse.User);
query.equalTo('username', phoneNumber);
query.find({
success: function(results) {
if (results.length > 0) {
Parse.User.logIn(phoneNumber, secretWord).then(function (user) {
res.success(user.getSessionToken());
}, function (err) {
res.error(err);
});
} else {
var user = new Parse.User();
user.set("username",phoneNumber);
user.set("password",secretWord);
user.setACL({"*": { "read": true }});
user.signUp(null, {
success: function(user) {
res.success(user.getSessionToken());
// Hooray! Let them use the app now.
},
error: function(user, error) {
alert("Error: " + error.code + " " + error.message);
}
});
}
},
error: function(error) {
res.error(err);
}
});
});
So using Parse I can just login to app with session_token generated with cloud code.
First question: can I do the same with QuickBlox - use for login some session_token generated in any cloud backend?
And the second question: when user logged in, session is expired in 2 hours and we have to renew session ?
When user has bad connection, before he receive useful information he has to renew session every 2 hours. Even Ukrainian API for Ukrainian usage (not for for best service in the world) use token generated with login function for any other requests. User should not renew session always - he get only useful information.
But if there is no approach in Quickblox without session renewing, then how to do this renew in right way ? I am very new to iOS development, but when I used Parse, I didi not get this problems (