PyQt4-创建一个计时器

Question

对于这个问题，我很抱歉，但是我已经阅读了很多东西，而且看来我还不懂如何做一个计时器。所以我发布我的代码：

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)
        while not path.empty():
            aim = path.get_nowait()
            func = functools.partial(self.move_towards, aim)
            timer = QtCore.QTimer()
            QtCore.QTimer.connect(timer, QtCore.SIGNAL("timeout()"), self, QtCore.SLOT("func()"))
            timer.start(200)

    def move_towards(self, goal):
        self.setPos(goal.first(), goal.second())

我正在尝试使该对象每200毫秒朝目标移动一次。我没有自我尝试过，它给了我同样的错误：

QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'bytes'
QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'bytes'
QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 2 has unexpected type 'bytes'

我不知道如何将计时器连接到带有参数的函数。我以为我没有正确使用SLOT参数，但这给了我这些错误。我想这都是错的。我将不胜感激:)

Answer 1

使用新样式的信号，它们更容易理解。

交换-

QtCore.QTimer.connect(timer, QtCore.SIGNAL("timeout()"), self, QtCore.SLOT("func()"))

与-

timer.timeout.connect(self.move_towards)   # assuming that move_towards is the handler

一个简单但完整的计时器示例-

import sys

from PyQt4.QtCore import QTimer
from PyQt4.QtGui import QApplication

app = QApplication(sys.argv)
app.setQuitOnLastWindowClosed(False)

def tick():
    print 'tick'

timer = QTimer()
timer.timeout.connect(tick)
timer.start(1000)

# run event loop so python doesn't exit
app.exec_()