对话框——颜色对话框

示例效果如下：

示例代码：

#!/usr/bin/python3
# -*- coding: utf-8 -*-

"""
ZetCode PyQt5 tutorial

In this example, we select a color value
from the QColorDialog and change the background
color of a QFrame widget.

Author: Jan Bodnar
Website: zetcode.com
Last edited: August 2017
"""

from PyQt5.QtWidgets import (QWidget, QPushButton, QFrame, QColorDialog, QApplication)
from PyQt5.QtGui import QColor
import sys


class Example(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):

        # 初始化QFrame的颜色为黑色
        col = QColor(0, 0, 0)

        self.btn = QPushButton('Dialog', self)
        self.btn.move(20, 20)

        self.btn.clicked.connect(self.showDialog)

        self.frm = QFrame(self)
        self.frm.setStyleSheet("QWidget { background-color: %s }" % col.name())
        print(col.name())
        self.frm.setGeometry(130, 22, 100, 100)

        self.setGeometry(300, 300, 250, 180)
        self.setWindowTitle('Color dialog')
        self.show()

    def showDialog(self):

        # 弹出QColorDialog
        col = QColorDialog.getColor()

        # 我们要先检查col的值。
        # 如果点击的是Cancel按钮，返回的颜色值是无效的。
        # 当颜色值有效时，我们通过样式表(style sheet)来改变背景颜色
        if col.isValid():
            self.frm.setStyleSheet("QWidget { background-color: %s }"
                % col.name())


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())