How to refresh component after button click for viewing updated values after refreshing page in Salesforce Lightning?

For the  refresh  view, run  $A.get('e.force:refreshView').fire();, which will reload all data for the view.

Example:-

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);

}