get value from ofxUIIntSlider guiEvent

ofApp.cpp

void ofApp::setup(){
    myValue = 5;
    gui->addIntSlider("MY_INT_SLIDER", 0, 10, myValue);
}

void ofApp::guiEvent(ofxUIEventArgs &e)
{
    if (e.getName() == "MY_INT_SLIDER")
    {
        // the trick is in the cast....
        ofxUIIntSlider *slider = (ofxUIIntSlider *) e.widget;
        myValue slider->getValue();
    }
}

void ofApp::exit() 
{
    gui->saveSettings("settings.xml");
    delete gui;
}

ofApp.h

// irrelevant methods ommited
#pragma once

#include "ofMain.h"
#include "ofxUI.h"

class ofApp : public ofBaseApp{

public:
	void setup();
    void guiEvent(ofxUIEventArgs &e);
    void exit();
private:
    int             myValue;
    ofxUICanvas     *gui;
};