PyQt——按钮类控件QPushButton

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class Form(QDialog):
	def __init__(self, parent=None):
		super(Form, self).__init__(parent)
		layout = QVBoxLayout()

		self.btn1 = QPushButton("Button1")
		self.btn1.setCheckable(True)
		self.btn1.toggle()
		self.btn1.clicked.connect(lambda:self.whichbtn(self.btn1) )
		self.btn1.clicked.connect(self.btnstate)
		layout.addWidget(self.btn1)
            
		self.btn2 = QPushButton('image')
		self.btn2.setIcon(QIcon(QPixmap("./images/python.png")))
		self.btn2.clicked.connect(lambda:self.whichbtn(self.btn2) )
		layout.addWidget(self.btn2)
		self.setLayout(layout) 

		self.btn3 = QPushButton("Disabled")
		self.btn3.setEnabled(False)
		layout.addWidget(self.btn3)
        
		self.btn4= QPushButton("&Download")
		self.btn4.setDefault(True)
		self.btn4.clicked.connect(lambda:self.whichbtn(self.btn4))
		layout.addWidget(self.btn4)
		self.setWindowTitle("Button demo")

	def btnstate(self):
		if self.btn1.isChecked():
			print("button pressed" ) 
		else:
			print("button released" ) 

	def whichbtn(self,btn):
		print("clicked button is " + btn.text() ) 

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

PyQt的按钮设置主要包括：按钮内容、字体、按钮大小、快捷键、触发事件。

self.btn = QtGui.QPushButton(u'<<(L)', self)
self.btn.setFont(QtGui.QFont('Microsoft YaHei', 10))
self.btn.setStyleSheet(
                                 "QPushButton{color:rgb(101,153,26)}" #按键前景色
                                 "QPushButton{background-color:rgb(198,224,205)}"  #按键背景色
                                 "QPushButton:hover{color:red}" #光标移动到上面后的前景色
                                 "QPushButton{border-radius:6px}"  #圆角半径
                                 "QPushButton:pressed{background-color:rgb(180,180,180);border: None;}" #按下时的样式
                                 )
self.btn.resize(self.btn.sizeHint())#其中 self.btn.sizeHint() 即返回一个合适的大小，一般是系统根据按键上的内容自动调后的尺寸。
self.btn.setShortcut('L')
self.btn.clicked.connect(self.last)
 
#self.btn.setEnabled(True) #禁用
#self.btn.setEnabled(False) #放开

设置 QPushButton 样式及点击时 QPushButton:pressed 的样式

button.setStyleSheet(''' 
                     QPushButton
                     {text-align : center;
                     background-color : white;
                     font: bold;
                     border-color: gray;
                     border-width: 2px;
                     border-radius: 10px;
                     padding: 6px;
                     height : 14px;
                     border-style: outset;
                     font : 14px;}
                     QPushButton:pressed
                     {text-align : center;
                     background-color : light gray;
                     font: bold;
                     border-color: gray;
                     border-width: 2px;
                     border-radius: 10px;
                     padding: 6px;
                     height : 14px;
                     border-style: outset;
                     font : 14px;}
                     ''')

Qt样式表示例