PyQt 4 UI 冻结 [英] PyQt 4 UI freezes

问题描述

以下程序应该只是计数和 int 并在标签中显示其值.但过了一会儿，GUI 停止工作，而循环继续.

The following programm should just count up and int and displays its value in a label. But after a while the GUI stops working, while the loop continous.

from PyQt4 import QtGui,QtCore
import sys

class main_window(QtGui.QWidget):
    def __init__(self,parent=None):
        #Layout       
        QtGui.QWidget.__init__(self,parent)
        self.bt=QtGui.QPushButton('crash')
        self.lbl=QtGui.QLabel('count')
        ver=QtGui.QHBoxLayout(self)
        ver.addWidget(self.bt)
        ver.addWidget(self.lbl)
        self.cnt=0
        self.running=False
        self.connect(self.bt,QtCore.SIGNAL("clicked()"),self.count)

    def count(self):
        self.running=True
        while self.running:
            self.cnt+=1
            print self.cnt
            self.lbl.setText(str(self.cnt))
            self.repaint()

if __name__ == '__main__':

    app = QtGui.QApplication(sys.argv)
    mw=main_window()
    mw.show()
    sys.exit(app.exec_())   

有什么帮助吗?

推荐答案

def count(self):
    self.running=True
    while self.running:
        self.cnt+=1
        print self.cnt
        self.lbl.setText(str(self.cnt))
        self.repaint()

你有没有想过退出这个无限循环?例如.self.running=False.
GUI 可能会停止工作，因为它没有足够的时间来执行 repaint.您可能希望在循环中添加一些 time.sleep 以等待 GUI 重新绘制.

Have you thought about any exit from this endless loop? E.g. self.running=False.
GUI may stop working because it doesn't have enough time to perform repaint. You may want to add some time.sleep in the loop to wait for the GUI to repaint.

更新:您应该使用 QTimer，不是简单的 while 循环，适用于您正在实施的行为.

Upd.: You should use QTimer, not a simple while loop, for the behavior you're implementing.

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