PyQt4-timer.timeout.connect（）-找不到参考 [英] PyQt4 - timer.timeout.connect() - cannot find reference

问题描述

from PyQt4 import QtGui, QtCore
from code.pair import Pair
from code.breadth_first_search import breadth_first_search
import functools

class Ghosts(QtGui.QGraphicsPixmapItem):

    def __init__(self, name):
        super(Ghosts, self).__init__()

        self.set_image(name)

    def chase(self, goal):
        pos = Pair(self.x(), self.y())
        path = breadth_first_search(pos, goal)

        func = functools.partial(self.move_towards, path)
        timer = QtCore.QTimer()
        timer.timeout.connect(func)
        timer.start(700)

    def move_towards(self, path):
        print("in")
        if path.empty():
            return
        goal = path.get_nowait()
        self.setPos(goal.first(), goal.second())

当我键入它时，它告诉我 timer.timeout.connect（）-找不到引用， ld解决，但是没有解决，运行时什么也没发生。然后，我尝试使用 QtCore.QTimer.singleShot（700，func）而不是上面的计时器，它可以正常运行，但只执行一次（应该如此）。我试图使计时器执行多次的所有操作均失败。请帮忙。

When I type this it tells me timer.timeout.connect() - cannot find reference, this should resolve but doesn't and nothing happens when I run it. Then I try QtCore.QTimer.singleShot(700, func) instead of the timer above and it works perfecly but executes only once (as it should). Everything I tried to make a timer that executes many times fails. Please help.

推荐答案

您犯了一个非常常见的错误。没有内容链接到您的计时器，因此在 chaise 函数结束后，该链接将被删除。将 timer 替换为 self.timer 。

You made a very common mistake. Nothing holds a link to your timer, so it gets deleted after chaise function ends. Replace timer with self.timer.

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