TouchScreenKeyboard flickers

I'm having an issue when i build my scene to an iOS device , the native iOS keyboard flickers endlessly and game becomes non-interactive such that i can't even input any characters onto the textfield. I recently started experimenting with the TouchScreenKeyboard library and tried a bunch of relative solutions on unity answers but its still not resolvable. Here are 3 sections of my input class below. Any help would be great thanks.

  void Start()
     {
         touchKeyboard = TouchScreenKeyboard.Open("", TouchScreenKeyboardType.Default, true, true, false, false, "");
         touchKeyboard.active = false;
 
         TouchScreenKeyboard.hideInput = true;
         //touchKeyboard = new TouchScreenKeyboard("", TouchScreenKeyboardType.Default, true, true, false, false, "");
     }


 //Inside OnGUI()
 GUI.SetNextControlName("type here...");
         playerName = GUI.TextField(new Rect(Screen.width / 2 - Screen.width / 20, Screen.height / 2 - Screen.height / 10, Screen.width / 2.2f, Screen.height / 10), playerName, 12, textStyle);
         playerName = playerName.Replace("\n", "");
         playerName = playerName.Replace(" ", "");
 
         //platform dependent
 #if UNITY_IPHONE || UNITY_ANDROID
         MobileKeyboard();
 #endif


     void MobileKeyboard()
     {
         if (!isKeyboardOpen && !isDoneInput)
         {
             touchKeyboard.active = true;
             playerName = touchKeyboard.text;
         }
 
         if (touchKeyboard.done)
         {
             touchKeyboard.active = false;
             isKeyboardOpen = true;
             isDoneInput = true;
             touchKeyboard.text = touchKeyboard.text.Replace("\n", "");
             playerName = touchKeyboard.text;
         }
         else if (touchKeyboard.wasCanceled)
         {
             touchKeyboard.active = false;
             touchKeyboard.text = "";
         }
     }