QPushButton按钮的使用

 1 import sys
 2 from PyQt5.QtCore import *
 3 from PyQt5.QtGui import *
 4 from PyQt5.QtWidgets import *
 5
 6 class Form(QDialog):
 7     def __init__(self):
 8         super(Form, self).__init__()
 9         layout = QVBoxLayout()
10
11         self.btn1 = QPushButton("Button1")
12         self.btn1.setCheckable(True)
13         self.btn1.toggle()
14         self.btn1.clicked.connect(lambda: self.whichbtn(self.btn1))
15         self.btn1.clicked.connect(self.btnstate)
16         layout.addWidget(self.btn1)
17
18         self.btn2 = QPushButton("image")
19         self.btn2.setIcon(QIcon(QPixmap("chinaz16.png")))
20         self.btn2.clicked.connect(lambda : self.whichbtn(self.btn2))
21         layout.addWidget(self.btn2)
22         self.setLayout(layout)
23
24         self.btn3 = QPushButton("Disabled")
25         self.btn3.setEnabled(False)
26         layout.addWidget(self.btn3)
27
28         self.btn4 = QPushButton("&Download")
29         self.btn4.setDefault(True)
30         self.btn4.clicked.connect(lambda: self.whichbtn(self.btn4))
31         layout.addWidget(self.btn4)
32
33         self.setWindowTitle("Button demo")
34
35     def btnstate(self):
36         if self.btn.isChecked():
37             print("button pressed")
38         else:
39             print("button released")
40
41     def whichbtn(self,btn):
42         print("clicked button is "+ btn.text())
43
44 if __name__ == '__main__':
45     app = QApplication(sys.argv)
46     btnDemo = Form()
47     btnDemo.show()
48     sys.exit(app.exec_())

效果图：