从 .ui 访问元素

Question

我无法从我的 dialog.ui 访问我的按钮和标签。我正在使用 Python 3.x 和 QT Designer 5.x。

from PyQt5 import uic, QtWidgets
from PyQt5.QtWidgets import QApplication

Form, Window = uic.loadUiType("dialog.ui")      #load ui (GUI) file

app = QApplication([])  #create a QApplication

window = Window()                               

form = Form()
form.setupUi(window)

def on_click():
    # self.qlFreeText.text("hello")
    alert = QMessageBox()
    alert.setText("You clicked the button!")
    alert.exec_()

class Ui(QtWidgets.QMainWindow):
    def __init__(self):
        super(Ui, self).__init__()
        uic.loadUi('basic.ui',self)

        # self.ButtonSearch = self.findChild(QtWidgets.QPushButton, 'qpbSearch')    
        self.ButtonSearch = self.findChild(QtWidgets.QObject, 'qpbSearch')  
        self.ButtonSearch.button.clicked.connect(self.printButtonPressed)

        self.qlFreeText = self.findChild(QWidgets.QLabel, 'qlFreeText') 

        # self.show()

    def printButtonPressed(self):
        on_click()


window.show()       #show window

app.exec_()         #run application until user closes it

dialog.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <widget class="QDateEdit" name="dateStart">
   <property name="geometry">
    <rect>
     <x>50</x>
     <y>50</y>
     <width>110</width>
     <height>22</height>
    </rect>
   </property>
   <property name="displayFormat">
    <string>yyyy-MM-dd</string>
   </property>
  </widget>
  <widget class="QDateEdit" name="dateEnd">
   <property name="geometry">
    <rect>
     <x>220</x>
     <y>50</y>
     <width>110</width>
     <height>22</height>
    </rect>
   </property>
   <property name="displayFormat">
    <string>yyyy-MM-dd</string>
   </property>
  </widget>
  <widget class="QLabel" name="qlFreeText">
   <property name="geometry">
    <rect>
     <x>120</x>
     <y>140</y>
     <width>55</width>
     <height>16</height>
    </rect>
   </property>
   <property name="text">
    <string>TextLabel</string>
   </property>
  </widget>
  <widget class="QPushButton" name="qpbSearch">
   <property name="geometry">
    <rect>
     <x>190</x>
     <y>220</y>
     <width>93</width>
     <height>28</height>
    </rect>
   </property>
   <property name="text">
    <string>PushButton</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

当我点击按钮时，什么也没有发生。我想尝试的是，当我单击按钮时，它会更改标签文本。但目前我什至不能使用点击按钮。

Answer 1

您混淆了以下概念：

• 您正在创建 UI 类，您可以在其中创建连接但从不使用它。你认为某事是如何运作的？

• 您不需要使用 findChild()，因为如果您使用 loadUi 或 loadUiType，它将使用 objectName 映射对象。

综合以上情况，解决方案如下：

loadUi():

from PyQt5 import uic, QtWidgets


class Ui(QtWidgets.QDialog):
    def __init__(self):
        super(Ui, self).__init__()
        uic.loadUi("dialog.ui", self)
        self.qpbSearch.clicked.connect(self.printButtonPressed)

    def printButtonPressed(self):
        self.qlFreeText.setText("hello")

        alert = QtWidgets.QMessageBox()
        alert.setText("You clicked the button!")
        alert.exec_()


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = Ui()
    w.show()  # show window
    sys.exit(app.exec_())

loadUiType():

from PyQt5 import uic, QtWidgets

Form, _ = uic.loadUiType("dialog.ui")


class Ui(QtWidgets.QDialog, Form):
    def __init__(self):
        super(Ui, self).__init__()
        self.setupUi(self)
        self.qpbSearch.clicked.connect(self.printButtonPressed)

    def printButtonPressed(self):
        self.qlFreeText.setText("hello")

        alert = QtWidgets.QMessageBox()
        alert.setText("You clicked the button!")
        alert.exec_()


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = Ui()
    w.show()  # show window
    sys.exit(app.exec_())

---

我建议你查看Using Qt Designer。

Answer 2

from PyQt5 import QtWidgets, uic
import sys


def clicked_me():
    print("You Clicked Me! :-)")


app = QtWidgets.QApplication([])
win = uic.loadUi("main_window.ui")

win.btn_start_capture.clicked.connect(clicked_me)
# My Button's Name is btn_start_capture

win.show()
sys.exit(app.exec())

Answer 3

在我的文件中，我就是这样做的。

加载用户界面

self.ui = uic.loadUi('pyqt-gui-form.ui', self)

对象的名称是save_credentials_btn

self.ui.save_credentials_btn.clicked.connect(self.save_user)

整个文件

from PyQt6.QtWidgets import QApplication, QWidget
import sys # This module provides access to some variables used or maintained by the interpreter and to functions that interact strongly with the interpreter. It is always available.
from PyQt6 import uic


class Window(QWidget):
    def __init__(self):
        super().__init__()
        # LOAD UI FILE
        self.ui = uic.loadUi('pyqt-gui-form.ui', self)
        self.ui.save_credentials_btn.clicked.connect(self.save_user)

    def save_user(self):
        print("Save User")

app = QApplication([])
window = Window()
window.show()
sys.exit(app.exec())