对PyQt5基本窗口控件 QMainWindow的使用详解

# _*_ coding:utf-8 _*_
import sys
from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton)
from PyQt5.QtGui import QIcon

class MainWindow(QMainWindow):
 def __init__(self, parent=None):
  super(MainWindow, self).__init__(parent)
  self.init_ui()

 def init_ui(self):
  #设置窗口属性
  self.setGeometry(200, 200, 400, 200)
  self.setWindowTitle('创建主窗口')
  self.setWindowIcon(QIcon(r"E:\\1.jpg"))
  #设置状态栏
  self.status = self.statusBar()
  self.status.showMessage('我是状态栏', 5000)


if __name__ == "__main__":
 app = QApplication(sys.argv[1:])

 window = MainWindow()
 window.show()

 sys.exit(app.exec_())

# _*_ coding:utf-8 _*_
import sys
from PyQt5.QtWidgets import (QApplication, QMainWindow, QDesktopWidget)
from PyQt5.QtGui import QIcon

class MainWindow(QMainWindow):
 def __init__(self, parent=None):
  super(MainWindow, self).__init__(parent)
  self.init_ui()

 def init_ui(self):
  #设置窗口属性
  self.resize(400, 200)
  self.setWindowTitle('主窗口居中显示')
  self.setWindowIcon(QIcon(r"E:\\1.jpg"))
  #设置状态栏
  self.status = self.statusBar()
  self.status.showMessage('我是状态栏', 5000)
  #居中显示处理
  self.move_center()

 def move_center(self):
  screen = QDesktopWidget().screenGeometry()
  form = self.geometry()
  x_move_step = (screen.width() - form.width()) / 2
  y_move_step = (screen.height() - form.height()) / 2
  self.move(x_move_step, y_move_step)

if __name__ == "__main__":
 app = QApplication(sys.argv[1:])

 window = MainWindow()
 window.show()

 sys.exit(app.exec_())

screen = QDesktopWidget().screenGeometry()

self.geometry()

# _*_ coding:utf-8 _*_
import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QVBoxLayout,
        QPushButton, QMainWindow)

class MainWindow(QMainWindow):
 def __init__(self):
  super(MainWindow, self).__init__()
  self.init_ui()

 def init_ui(self):
  self.setWindowTitle('关闭主窗口')

  layout = QVBoxLayout()
  self.close_btn = QPushButton('关闭', self)
  layout.addWidget(self.close_btn)

  main_frame = QWidget()
  self.setCentralWidget(main_frame)
  main_frame.setLayout(layout)

  self.close_btn.clicked.connect(self.on_button_click)

 def on_button_click(self):
  #将信息显示在状态栏中
  sender = self.sender()
  msg = sender.text() + " 被按下了"
  status = self.statusBar()
  status.showMessage(msg, 5000)
  #程序退出
  app = QApplication.instance()
  app.quit()

if __name__ == "__main__":
 app = QApplication(sys.argv[1:])

 window = MainWindow()
 window.show()

 sys.exit(app.exec_())

self.close_btn.clicked.connect(self.on_button_click)