Invalid Session Token (Code: 209 Version: 1.7.4) - swift

Question

Every time I go to run my app the app runs fine but the console prints an error. The error is "Invalid Session Token (Code: 209 Version: 1.7.4)"
I checked Parse.com and they told me to handle this error, writing a global utility function that is called by all of my parse request error callbacks. They said i can handle the "invalid session token" error in this global function and I should prompt the user to login again so that they can obtain a new session token. However when I try to input the code in my app I get the error that I am using unresolved identifiers.
Does anyone know how to fix an Invalid Session Token error. Or how I can use the code "kPFErrorInvalidSessionToken" in my app. Any help would be greatly appreciated. (the language I am writing in is swift)

Answer 1

I have tried to call ParseErrorHandler.handleParseError(err) not just only from AppDelegate, but also from other view controllers and it was not worked properly. Here is solution which works from every VC:
class ParseErrorHandler {
class func handleParseError(error: NSError) {
if error.domain != PFParseErrorDomain {
return
}
switch (error.code) {
// error code 209 handling
case PFErrorCode.ErrorInvalidSessionToken.rawValue:
invalidSessionTokenHandler()
default:
break
}
}
// NOTE: User has no other option but to log out in this implementation
private class func invalidSessionTokenHandler() {
let message: String = "Session is no longer valid! Please login again!"
let alert = UIAlertController(title: nil, message: message, preferredStyle: .Alert)
var vc = UIApplication.sharedApplication().keyWindow?.rootViewController
while (vc!.presentedViewController != nil)
{
vc = vc!.presentedViewController
}
vc?.presentViewController(alert, animated: true, completion: nil)
let logoutAction = UIAlertAction(title: "OK", style: .Default, handler: {
(UIAlertAction) -> Void in
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let exampleViewController: SignUpViewController = mainStoryboard.instantiateViewControllerWithIdentifier("SignUpViewController") as! SignUpViewController
vc?.presentViewController(exampleViewController, animated: true, completion: nil)
PFUser.logOut()
})
alert.addAction(logoutAction)
}
}
Hopefully I will save somebody's time!

Answer 2

If by saying "unresolved identifiers" you mean to "kPFErrorInvalidSessionToken" then you should use PFErrorCode.ErrorInvalidSessionToken.rawValue instead.
please tell me if you succeded in catching the error because all i get back is a nil NSErrorPointer.

Answer 3

Here is my solution, largely based on code in the Parse.com iOS developers guide.
class ParseErrorHandler {
class func handleParseError(error: NSError) {
if error.domain != PFParseErrorDomain {
return
}
switch (error.code) {
// error code 209 handling
case PFErrorCode.ErrorInvalidSessionToken.rawValue:
invalidSessionTokenHandler()
default:
break
}
}
// NOTE: User has no other option but to log out in this implementation
private class func invalidSessionTokenHandler() {
let message: String = "Session is no longer valid, you are no longer logged in"
let alert = UIAlertController(title: nil, message: message, preferredStyle: .Alert)
let presentingViewController = UIApplication.sharedApplication().keyWindow?.rootViewController
presentingViewController?.presentViewController(alert, animated: true, completion: nil)
let logoutAction = UIAlertAction(title: "OK", style: .Default, handler: {
(UIAlertAction) -> Void in
let loginViewController:UIViewController = UIStoryboard(name: "Main", bundle:
nil).instantiateViewControllerWithIdentifier("Login_2.0")
presentingViewController?.presentViewController(loginViewController, animated: true, completion: nil)
PFUser.logOut()
})
alert.addAction(logoutAction)
}
}
Above is the errorHandler class that should be used to catch all errors according to the Parse documentation (in this case I'm only showing error 209)
Here is how I catch this error in AppDelegate.swift within application function:
PFAnalytics.trackAppOpenedWithLaunchOptionsInBackground(launchOptions, block: {
(suceeded: Bool?, error: NSError?) -> Void in
if let err = error {
ParseErrorHandler.handleParseError(err)
}
})
Note that the user is technically still logged in hence why logout is called