CODEWITHSUNDEEP
xamarin.iosxamarin
user4560774
user4560774

Reputation:

NSUserDefaults can not save NSDictionary Data in Xamarin

In the B Viewcontroller, I store data into NSUserDefaults and retrieve them in AViewController.

During the execution, it performs as it expected. However, once I close and re-run the app, I figure out that these information (dictionary) does not being stored.

Here is the BViewController where I store the data in NSUserDefaults

partial class BViewController : UIViewController
{
    const string server = "server";
    const string port = "port";
    const string password = "password";
    const string username = "username";
    const string inboxuserid = "inboxuserid";
    .............
    .............



  public override void ViewWillDisappear (bool animated)
  {
    var appDefaults = new NSDictionary (server, serverTF.Text, port, portTF.Text, password, passwordTF.Text,username,usernameTF.Text, inboxuserid,inboxuserTF.Text);
    NSUserDefaults.StandardUserDefaults.RegisterDefaults (appDefaults);
    NSUserDefaults.StandardUserDefaults.Synchronize ();
  }

}

and retrieve them in the A ViewController as follows:

partial class AViewController : UIViewController
 {
  public override void ViewWillAppear(bool animated)
   {
    var username = NSUserDefaults.StandardUserDefaults.StringForKey ("username");
    Console.WriteLine (username);
    }
}

Upvotes: 0

Views: 1221

Answers (1)

casillas
casillas

Reputation: 16813

Based on the following article: https://moovendan.wordpress.com/2012/12/26/monotouch-nsuserdefaults-store-values-in-settings/

I would propose the following code, I have tested with a small example and it worked.

BViewController, store the dictionary in the NSUserDefaults:

NSDictionary appDefaults= new NSDictionary(server, serverTF.Text, port, portTF.Text, password, passwordTF.Text, username, usernameTF.Text, inboxuserid, inboxuserTF.Text);
NSString key = new NSString ("dict");
NSUserDefaults.StandardUserDefaults.SetValueForKey (appDefaults, key);

AViewController, retrive the dictionary from NSUserDefaults:

NSString key = new NSString ("dict");
NSDictionary d2 = NSUserDefaults.StandardUserDefaults.DictionaryForKey (key);
Console.WriteLine (d2["username"]);

Upvotes: 2

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