How to refresh a Lightning Component after Success in Salesforce?

Reloads the view.
To refresh a view, run $A.get('e.force:refreshView').fire();, which reloads all data for the view.
This example refreshes the view after an action is successfully completed.
refresh : function(component, event, helper) {
var action = component.get('c.myController');
action.setCallback(component,
function(response) {
var state = response.getState();
if (state === 'SUCCESS'){
$A.get('e.force:refreshView').fire();
} else {
//do something
}
}
);
$A.enqueueAction(action);
}

Navigate to Setup | Customize | Contacts | Fields.
Look for the picklist and click it.
Click Edit link for the field need to be set as default.
Select "Make this value the default for the master picklist", if any other value selected as default prior, it will be auto deselect.
Click Save button.