PyQt5让QDialog在允许用户输入之前等待进程完成

from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QApplication, QDialog, QVBoxLayout, QLabel, QPushButton

class ProcessThread(QThread):
    finished = pyqtSignal()  # 定义一个信号，用于在进程完成时发射

    def run(self):
        # 在这里执行耗时的进程
        # ...
        
        self.finished.emit()  # 发射信号，表示进程已完成

class WaitingDialog(QDialog):
    def __init__(self):
        super().__init__()

        layout = QVBoxLayout()
        label = QLabel("正在处理，请稍候...")
        layout.addWidget(label)

        button = QPushButton("取消")
        button.clicked.connect(self.close)
        layout.addWidget(button)

        self.setLayout(layout)
        self.setWindowTitle("等待对话框")
        self.setModal(True)  # 设置为模态对话框

    def processFinished(self):
        self.close()  # 进程完成时关闭对话框

app = QApplication([])
dialog = WaitingDialog()

thread = ProcessThread()
thread.finished.connect(dialog.processFinished)
thread.start()

dialog.exec_()
app.exec_()