Appcelerator. Handling user sessions

Titanium SDK version: 1.6.1 iPhone SDK version: 4.2

I am a bit confused about what is the best practice when dealing with user "sessions" in Appcelerator apps (iPhone). Like it is now I save the users token in a property and then check on each page that it still exists (like on a webpage). This does not work so good and there must be a better way.

So, what is the best practise for handling user login sessions? Can someone explain th开发者_StackOverflowe process for me? Step by step.

Thankful for all input!

I've been handling authentication verification on iOS as follows:

1. In my app.js on first load I check that the token is valid, if not I display a login.

   I use methods similar to the below

    function need2Login(){
      var lastLogin = Ti.App.Properties.getString('last_login');
      if(lastLogin.length==0){
          return true; 
      }

      //add some date validation to expire any tokens

      // return a value based on the validation rules
    };

function manageLogin(){
    if(need2Login()){
       wLogin.open(); //Open Login window
    }else{
             wMain.open(); //Open Main window
    }   
};

1. When the user logs out, I fire an event back to the app.js to reload the login screen
2. I also have the below in my app.js to handle on App Resume I also check if the token is still valid

For the resuming handling I use the following in my app.sj:

1) Check if we're on iOS 4+

function isiOS4Plus(){
    // add iphone specific tests
    if (Ti.Platform.name == 'iPhone OS'){
        var version = Ti.Platform.version.split(".");
        var major = parseInt(version[0],10);

    // can only test this support on a 3.2+ device
    if (major >= 4){
        return true;
    }
   }
   return false;
};

2) Then add the handler

if (isiOS4Plus()){
    // fired when an app resumes for suspension
    Ti.App.addEventListener('resumed',function(e){
       //check if login is still valid
       manageLogin(); //I just reuse my login logic on resume
    });
}

Please note this assumes checking the authentication token only needs to be done when the App starts, or resumes. This should cover most cases, but there are aways ones were it wont fit.