Question

我正在尝试使list2清除其中包含的内容并为其分配一个新值，但是在尝试使用我自己的方法fillListView而不是内置函数时遇到错误self.list2.clear。如何避免它并使其按预期工作？

class Ui(object):
    def setupUi(self, Ui):
        self.List1= QtGui.QListWidget(self.ProjectNavigator)
        self.List1.setGeometry(QtCore.QRect(10, 50, 141, 241))
        self.List1.setObjectName(_fromUtf8("List1"))
        self.List2 = QtGui.QListWidget(self.ProjectNavigator)
        self.List2.setGeometry(QtCore.QRect(170, 50, 141, 241))
        self.List2.setObjectName(_fromUtf8("List2"))

        ### QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.List2.clear) This one works but it's only clear the list
        QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.fillListView())

这是我的方法：

def fillListView(self):
   self.List2.clear,
   self.List2.addItem("TEST1")
   self.List2.addItem("TEST2")

回溯：

TypeError: arguments did not match any overloaded call:
  QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
  QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
  QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 2 has unexpected type 'str'

Answer 1

当您用以下信号连接信号时，问题是：

QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.fillListView())

您传递self.fillListView()的返回值，即None，而不是函数本身。

尝试：

QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.fillListView)

此外，在您的fillListView()方法中，您可能希望实际使用以下方法运行clear方法：

self.list2.clear()  # note the parethesis

此外，正如其他评论员所说，您应该决定是否要将其称为self.list2或self.List2。我会建议小写。

PyQT：更改列表项时调用我自己的方法

1 个答案: