Why is the try catch method in Unity not preventing my app from quitting/crashing?

I have two methods SaveToiCloud and GetFromiCloud that are doing what they say. I removed on purpose any null checks to see if the try and catch could do their job alone. However in Unity it is not crashing but when I build it to swift it is. "terminating with uncaught exception of type NSException (lldb) " . I thought I'am catching every exception... Also the crash ONLY happens when I first try to get the value (this is not giving me an error!) and then try to save it (this is). I think this is because I'am setting the value to null with GetFromiCloud, but then again I thought the exception should be catched.

 public void SaveToiCloud()
     {
         try{
         // all variables are stored on GlobalD. with default value assigned to them
        // all variables in this class are stored with no default value (to check)

             level = GlobalData.instance.level;
             health = GlobalData.instance.health;
             doorOpen = GlobalData.instance.doorOpen;
             nameplayer = GlobalData.instance.nameplayer;
 
             IntToDictionary(); //I have made sure no keys are overriding
             StringToDictionary();
             BoolToDictionary();
 
             iCloudSaveValue();
         }
 
         catch (System.Exception ex)
         {//Unity is successfully showing me this exception without crashing/quitting
             Debug.Log(ex);
             Debug.Log(ex.Message);
             Debug.Log(ex.StackTrace);
             
         }
     }
 
     public void GetFromiCloud()
     {
         try
         {
             GetIntFromiCloudDic();
             GetStringFromiCloudDic();
             GetBoolFromiCloudDic();
 
             GlobalData.instance.level = level;
             GlobalData.instance.health = health;
             GlobalData.instance.doorOpen = doorOpen;
             GlobalData.instance.namePlayer = namePlayer;
 
             SaveSystem4.SavingToFile();
 
         }
 
         catch (System.Exception ex)
         {
             Debug.Log(ex);
             Debug.Log(ex.Message);
             Debug.Log(ex.StackTrace);
         }
 public void iCloudSaveValue()
     {
         foreach (KeyValuePair<string, int> pair in DicInt)
         {
             bool success = iOSPlugin.iCloudSaveIntValue(pair.Key, pair.Value);
             if (success)
             {
                 iOSPlugin.ShowAlert("iCloud Value Saved Success", pair.Value.ToString());
             }
             else
             {
                 iOSPlugin.ShowAlert("iCloud Value Saved failed", pair.Value.ToString());
             }
         }
 void GetIntFromiCloudDic()
     {
         try
         {
             level = iOSPlugin.iCloudGetIntValue("Level"); // I know I should use null check
             health = iOSPlugin.iCloudGetIntValue("Health");
         }
         catch
         {
             iOSPlugin.ShowAlert("iCloud Value", string.IsNullOrEmpty(nameplayer) ? "Nothing Saved Yet..." : level.ToString());
             iOSPlugin.ShowAlert("iCloud Value", string.IsNullOrEmpty(nameplayer) ? "Nothing Saved Yet..." : health.ToString());
         }
       
         
     }