【多线程】python界面阻塞，白屏，not responding解决的简单例子

 # -*- coding: utf-8 -*-

 import sys, time
 from PyQt4.QtCore import *
 from PyQt4.QtGui import *
 x = 0
 class Window(QWidget):
     def __init__(self, parent = None):
         QWidget.__init__(self, parent)
         self.thread = Worker()

         # 提示信息
         self.xLable = QLabel("Number of xTimes:")
         # 下拉框
         self.spinBox = QSpinBox()
         self.spinBox.setMaximum(100)
         self.spinBox.setValue(10)
         self.startButton = QPushButton(self.tr("&Start"))
         # 布局
         layout = QGridLayout()
         layout.addWidget(self.xLable, 0, 0)
         layout.addWidget(self.spinBox, 0, 1)
         layout.addWidget(self.startButton, 0, 2)
         self.setLayout(layout)
         # 标题
         self.setWindowTitle(self.tr("Threading"))

         # 信号
         self.connect(self.thread, SIGNAL("finished()"), self.finishSend)
         self.connect(self.thread, SIGNAL("update(int)"), self.updateGUIStatus)
         self.connect(self.startButton, SIGNAL("clicked()"), self.sendAdvMail)

     def sendAdvMail(self):
         self.spinBox.setReadOnly(True)
         self.startButton.setEnabled(False)
         #传递值到线程中
         self.thread.render(self.spinBox.value())

     def updateGUIStatus(self, leftTime):
         self.xLable.setText(str(leftTime))

     def finishSend(self):
         self.spinBox.setReadOnly(False)
         self.startButton.setEnabled(True)

 class Worker(QThread):
     def __init__(self, parent = None):
         QThread.__init__(self, parent)
         self.exiting = False
         self.xTimes = 0

     def __del__(self):
         self.exiting = True
         self.wait()

     def render(self, xTimes):
         self.xTimes = xTimes
         self.start()

     def run(self):
         # Note: This is never called directly. It is called by Qt once the
         # thread environment has been set up.
         n = self.xTimes
         while not self.exiting and n > 0:
             time.sleep(1)
             #该信号引起界面更新
             n -= 1
             self.emit(SIGNAL("update(int)"), n)

 if __name__ == "__main__":
     app = QApplication(sys.argv)
     window = Window()
     window.show()
     sys.exit(app.exec_())

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