Multi tool use

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Store token locally in Xamarin.IOS

I am working on a Xamarin cross-platform native project and I have to store the token (get from the server after login) both Android and IOS side. On the Android side I used SharedPrefferences which works great, but I can't find a solution for IOS. Now I am using KeyChain, but the result is always wrong.

Here is my code:

The KeyChain class:

using System;
using Foundation;
using Security;

namespace BloodNotes.iOS

public class KeyChain

public string ValueForKey(string key)

var record = ExistingRecordForKey(key);
SecStatusCode resultCode;
var match = SecKeyChain.QueryAsRecord(record, out resultCode);

if (resultCode == SecStatusCode.Success)
return NSString.FromData(match.ValueData, NSStringEncoding.UTF8);
else
return String.Empty;


public void SetValueForKey(string value, string key)

var record = ExistingRecordForKey(key);
if (value == "")

if (ValueForKey(key) != "")
RemoveRecord(record);

return;


// if the key already exists, remove it
if (ValueForKey(key) != "")
RemoveRecord(record);

var result = SecKeyChain.Add(CreateRecordForNewKeyValue(key, value));
if (result != SecStatusCode.Success)

throw new Exception(String.Format("Error adding record: " + result)); // I ALWAYS GET THIS EXCEPTION



private SecRecord CreateRecordForNewKeyValue(string key, string value)

return new SecRecord(SecKind.GenericPassword)

Account = key,
ValueData = NSData.FromString(value, NSStringEncoding.UTF8),
;


private SecRecord ExistingRecordForKey(string key)

return new SecRecord(SecKind.GenericPassword)

Account = key,
Label = key,
;


private bool RemoveRecord(SecRecord record)

var result = SecKeyChain.Remove(record);
if (result != SecStatusCode.Success)

throw new Exception(String.Format("Error removing record: 0", result));


return true;





And the TokenService:

using BloodNotes.ViewModel;
using Foundation;
using System.Diagnostics;

namespace BloodNotes.iOS.TokenService

class TokenService : Service.ITokenService

public const string KEY = "token";

public void SaveToken(string token)

KeyChain storage = new KeyChain();
storage.SetValueForKey(token, KEY);

Debug.WriteLine("RESULT: " + storage.ValueForKey(KEY));





Please, give me advise.

Thanks in advance for the answers!

1 Answer
1

Finally, I found a solution. Instead of KeyChain use NSUserDefaults.StandardUserDefaults, so my TokenService looks like:

using Foundation;
using System.Diagnostics;

namespace BloodNotes.iOS.TokenService

class TokenService : Service.ITokenService

public const string KEY = "token";

public void SaveToken(string token)

var storage = NSUserDefaults.StandardUserDefaults;
NSString value = new NSString(token);
NSString key = new NSString(KEY);
storage.SetValueForKey(value, key);

Debug.WriteLine("RESULT: " + storage.ValueForKey(key).ToString());





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