思路
使用QTimer.singleShot(3000, self.openwindown).完成单发：3s后执行openwindown
代码
from PySide6.QtCore import Signal, QTimer
from PySide6.QtGui import QFont, Qt
from PySide6.QtWidgets import QApplication, QWidget, QPushButton, QLabel, QVBoxLayout
class MainWindown(QWidget):
def __init__(self):
super().__init__()
self.mainLayout = QVBoxLayout()
self.label = QLabel('正在加载中。。。')
self.label.setFont(QFont('微软雅黑', 50))
self.label.setAlignment(Qt.AlignmentFlag.AlignCenter)
self.mainLayout.addWidget(self.label)
self.setLayout(self.mainLayout)
QTimer.singleShot(3000, self.openwindown) # 等待3s后执行openwindown
def openwindown(self):
self.close() # 关闭自己
self.subwindown = SubWindow()
self.subwindown.show() # 打开子窗口
class SubWindow(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle('进入程序')
self.label = QLabel('欢迎进入主程序')
self.label.setFont(QFont('微软雅黑', 30))
self.label.setAlignment(Qt.AlignmentFlag.AlignCenter)
self.mainLayout = QVBoxLayout()
self.mainLayout.addWidget(self.label)
self.setLayout(self.mainLayout)
if __name__ == '__main__':
app = QApplication([])
window = MainWindown()
window.show()
app.exec()