PyQt5 QTimer_pyqt qtimer安装

QTimer常用信号：

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

class WindowForm(QWidget):
    def __init__(self, parent=None):
        super(WindowForm, self).__init__(parent)
        self.setWindowTitle("QTimer Demo 1")
        self.listFile = QListWidget()
        self.label = QLabel("显示当前时间")
        self.startBtn = QPushButton("开始")
        self.stopBtn = QPushButton("停止")
        
        layout = QGridLayout(self)
        
        # 初始化一个定时器
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.showTime)

        layout.addWidget(self.label, 0,0, 1,2)
        layout.addWidget(self.startBtn, 1, 0)
        layout.addWidget(self.stopBtn, 1, 1)
        self.startBtn.clicked.connect(self.startTimer)
        self.stopBtn.clicked.connect(self.stopTimer)
        self.setLayout(layout)

    def showTime(self):
        time = QDateTime.currentDateTime()
        timeDisplay = time.toString("yyyy-MM-dd hh:mm:ss dddd")
        self.label.setText(timeDisplay)

    def startTimer(self):
        self.timer.start(1000)
        self.startBtn.setEnabled(False)
        self.stopBtn.setEnabled(True)
    
    def stopTimer(self):
        self.timer.stop()
        self.startBtn.setEnabled(True)
        self.stopBtn.setEnabled(False)

if __name__ == "__main__":
    app =QApplication(sys.argv)
    win = WindowForm()
    win.show()
    sys.exit(app.exec_())
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import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qt

if __name__ == "__main__":
    app = QApplication(sys.argv)
    label = QLabel("<font color=red size=128><b>Hello PyQt, 窗口会在3秒后消失!</b></font>")
    # 无边框窗口
    label.setWindowFlags(Qt.SplashScreen | Qt.FramelessWindowHint)
    label.show()

    QTimer.singleShot(3000, app.quit)
    sys.exit(app.exec_())
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