# -*- coding: utf-8 -*-
from PyQt5 import QtCore, QtGui, QtWidgets
from qgis.gui import QgsMessageBar
import importlib
import widget_button_dialog

class WidgetButton(QtWidgets.QDialog):
    def __init__(self):
        QtWidgets.QDialog.__init__(self)
        # Set up the user interface from Designer.
        # After setupUI you can access any designer object by doing:
        # self.<objectname>
        self.ui = widget_button_dialog.Ui_Dialog()
        self.ui.setupUi(self)

    def openForm(self):
        self.show()

    def testSignal(self):
        iface.messageBar().pushMessage("Aviso: ",
                                       u"El boton ha sido clickado",
                                       Qgis.Info, 5)

        self.close()

# Create the dialog and keep reference
importlib.reload(widget_button_dialog)
dlg = WidgetButton()

dlg.openForm()

btn = dlg.ui.pushButton

print (btn.objectName())

btn.clicked.connect(dlg.testSignal)