python之pyqt5通过按钮改变Label的背景颜色

最新推荐文章于 2025-05-12 08:30:37 发布

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最新推荐文章于 2025-05-12 08:30:37 发布

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分类专栏： pyqt5

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本文介绍如何使用PyQt5设计界面，包括按钮和Label的布局，并展示了通过按钮点击事件改变Label背景颜色的方法。代码中详细解释了如何创建窗口、设置按钮位置及功能，以及如何为Label设置背景色。

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首先是界面的布置，代码如下所示，使用的是Designer。

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt5 UI code generator 5.6
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.btn_1 = QtWidgets.QPushButton(self.centralwidget)
        self.btn_1.setGeometry(QtCore.QRect(220, 191, 75, 23))
        self.btn_1.setObjectName("btn_1")
        self.btn_2 = QtWidgets.QPushButton(self.centralwidget)
        self.btn_2.setGeometry(QtCore.QRect(220, 220, 75, 23))
        self.btn_2.setObjectName("btn_2")
        self.btn_3 = QtWidgets.QPushButton(self.centralwidget)
        self.btn_3.setGeometry(QtCore.QRect(220, 249, 75, 23))
        self.btn_3.setObjectName("btn_3")
        self.btn_4 = QtWidgets.QPushButton(self.centralwidget)
        self.btn_4.setGeometry(QtCore.QRect(220, 278, 75, 23))
        self.btn_4.setObjectName("btn_4")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(310, 190, 71, 101))
        font = QtGui.QFont()
        font.setFamily("Arial")
        font.setPointSize(36)
        self.label.setFont(font)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.btn_exit = QtWidgets.QPushButton(self.centralwidget)
        self.btn_exit.setGeometry(QtCore.QRect(220, 330, 75, 23))
        self.btn_exit.setObjectName("btn_exit")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.btn_1.setText(_translate("MainWindow", "1"))
        self.btn_2.setText(_translate("MainWindow", "2"))
        self.btn_3.setText(_translate("MainWindow", "3"))
        self.btn_4.setText(_translate("MainWindow", "4"))
        self.label.setText(_translate("MainWindow", "0"))
        self.btn_exit.setText(_translate("MainWindow", "退出"))

接下来是运行代码，如下所示：

# -*- coding: utf-8 -*-
'''
通过按钮改变Label的背景颜色
'''
import os
import sys
import time
from tqdm import tqdm
from PyQt5.QtWidgets import QApplication, QWidget, QMessageBox, QMainWindow
from PyQt5.QtGui import QPalette
from PyQt5.QtCore import Qt
from application.NewUi.untitled import Ui_MainWindow


class my_window(Ui_MainWindow, QMainWindow):
    def __init__(self):
        super(my_window, self).__init__()
        self.setupUi(self)
        self.label.setAutoFillBackground(True)
        global palette_red, palette_green, palette_blue, palette_yellow
        palette_red = QPalette()
        palette_green = QPalette()
        palette_blue = QPalette()
        palette_yellow = QPalette()
        palette_red.setColor(QPalette.Window, Qt.red)
        palette_green.setColor(QPalette.Window, Qt.green)
        palette_blue.setColor(QPalette.Window, Qt.blue)
        palette_yellow.setColor(QPalette.Window, Qt.yellow)
        self.btn_1.clicked.connect(self.btn_1_clicked)
        self.btn_2.clicked.connect(self.btn_2_clicked)
        self.btn_3.clicked.connect(self.btn_3_clicked)
        self.btn_4.clicked.connect(self.btn_4_clicked)
        self.btn_exit.clicked.connect(self.exit_systerm)
        self.setWindowTitle('通过按钮改变Label的背景颜色')

    def btn_1_clicked(self):
        self.label.setPalette(palette_red)

    def btn_2_clicked(self):
        self.label.setPalette(palette_blue)

    def btn_3_clicked(self):
        self.label.setPalette(palette_green)

    def btn_4_clicked(self):
        self.label.setPalette(palette_yellow)

    def exit_systerm(self):
        self.close()

    def closeEvent(self, event):
        reply = QMessageBox.question(self, 'Exit', 'Are you sure to quit?', QMessageBox.Yes | QMessageBox.Cancel)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = my_window()
    w.show()
    sys.exit(app.exec_())