对话框——颜色对话框

示例效果如下：
示例代码：
 1 #!/usr/bin/python3
 2 # -*- coding: utf-8 -*-
 3 
 4 """
 5 ZetCode PyQt5 tutorial
 6 
 7 In this example, we select a color value
 8 from the QColorDialog and change the background
 9 color of a QFrame widget.
10 
11 Author: Jan Bodnar
12 Website: zetcode.com
13 Last edited: August 2017
14 """
15 
16 from PyQt5.QtWidgets import (QWidget, QPushButton, QFrame, QColorDialog, QApplication)
17 from PyQt5.QtGui import QColor
18 import sys
19 
20 
21 class Example(QWidget):
22 
23     def __init__(self):
24         super().__init__()
25 
26         self.initUI()
27 
28     def initUI(self):
29 
30         # 初始化QFrame的颜色为黑色
31         col = QColor(0, 0, 0)
32 
33         self.btn = QPushButton('Dialog', self)
34         self.btn.move(20, 20)
35 
36         self.btn.clicked.connect(self.showDialog)
37 
38         self.frm = QFrame(self)
39         self.frm.setStyleSheet("QWidget { background-color: %s }" % col.name())
40         print(col.name())
41         self.frm.setGeometry(130, 22, 100, 100)
42 
43         self.setGeometry(300, 300, 250, 180)
44         self.setWindowTitle('Color dialog')
45         self.show()
46 
47     def showDialog(self):
48 
49         # 弹出QColorDialog
50         col = QColorDialog.getColor()
51 
52         # 我们要先检查col的值。
53         # 如果点击的是Cancel按钮，返回的颜色值是无效的。
54         # 当颜色值有效时，我们通过样式表(style sheet)来改变背景颜色
55         if col.isValid():
56             self.frm.setStyleSheet("QWidget { background-color: %s }"
57                 % col.name())
58 
59 
60 if __name__ == '__main__':
61 
62     app = QApplication(sys.argv)
63     ex = Example()
64     sys.exit(app.exec_())