###
from PySide2.QtWidgets import QMainWindow, QApplication
from uiLoader import load_ui
import sys

class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        self.pos1 = [0,0]
        self.pos2 = [0,0]
        control=" "
        QMainWindow.__init__(self, parent)
        load_ui('generator.ui', self)
        self.konButton.actionTriggered(self.konToolBar.konButton).connect(addaButton)
#def newLayout()

def handleToolbar(self):
    if control == "button":
        print ("button")

def addaButton(self):
    print ('clicked')
    #control = "button"
    #handleToolbar
    
def main():
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    app.exec_() 

if __name__ == '__main__':
    main()
###
###
uiloader.py
from PySide2.QtUiTools import QUiLoader
from PySide2.QtCore import QMetaObject
from PySide2.QtWidgets import QMainWindow


class UiLoader(QUiLoader):
    def __init__(self, base_instance):
        QUiLoader.__init__(self, base_instance)
        self.base_instance = base_instance

    def createWidget(self, class_name, parent=None, name=''):
        if parent is None and self.base_instance:
            return self.base_instance
        else:
            # create a new widget for child widgets
            widget = QUiLoader.createWidget(self, class_name, parent, name)
            if self.base_instance:
                setattr(self.base_instance, name, widget)
            return widget

def load_ui(ui_file, base_instance=None):
    loader = UiLoader(base_instance)
    widget = loader.load(ui_file)
    QMetaObject.connectSlotsByName(widget)
    return widget

###
###
generator.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>727</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget"/>
  <widget class="QToolBar" name="konToolBar">
   <property name="windowTitle">
    <string>toolBar</string>
   </property>
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
   <addaction name="konButton"/>
   <addaction name="kontoggle"/>
   <addaction name="kondial"/>
   <addaction name="kondiscreteDial"/>
   <addaction name="konControl"/>
   <addaction name="konvFader"/>
   <addaction name="konhfader"/>
   <addaction name="konScratcher"/>
   <addaction name="konWaveform"/>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
  <action name="button">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>button</string>
   </property>
   <property name="toolTip">
    <string>Momentary button</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="toggle">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>switch</string>
   </property>
   <property name="toolTip">
    <string>Momentary button</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="dial">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>dial</string>
   </property>
   <property name="toolTip">
    <string>continuous dial</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="discreteDial">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>multiswitch</string>
   </property>
   <property name="toolTip">
    <string>multi-position switch</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="xyControl">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>xyControl</string>
   </property>
   <property name="toolTip">
    <string>XY position control</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="vFader">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>vFader</string>
   </property>
   <property name="toolTip">
    <string>one ormore vertical faders</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="hfader">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>hfader</string>
   </property>
   <property name="toolTip">
    <string>one or more horizontal faders</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="scratcher">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>scratcher</string>
   </property>
   <property name="toolTip">
    <string>circular control which tracks distance and position from center</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
  <action name="waveform">
   <property name="checkable">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>waveform</string>
   </property>
   <property name="toolTip">
    <string>waveform display with time markers</string>
   </property>
   <property name="shortcut">
    <string>Alt+B</string>
   </property>
  </action>
 </widget>
 <resources/>
 <connections/>
</ui>
###