-QMessageBox

在

QMessageBox

exec_()

QTimer.singleShot()

from functools import partialfrom PyQt5 import QtCore, QtWidgetsdef center(window):    # https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen    window.setGeometry(        QtWidgets.QStyle.alignedRect( QtCore.Qt.LeftToRight, QtCore.Qt.AlignCenter, window.size(), QtWidgets.qApp.desktop().availableGeometry(),        )    )class Widget(QtWidgets.QWidget):    def __init__(self, parent=None):        super().__init__(parent)        self.btn_warning = QtWidgets.QPushButton( "Open QMessageBox", clicked=self.open_qmessagebox        )        lay = QtWidgets.QVBoxLayout(self)        lay.addWidget(self.btn_warning)        center(self)    @QtCore.pyqtSlot()    def open_qmessagebox(self):        infoBox = QtWidgets.QMessageBox()        infoBox.setIcon(QtWidgets.QMessageBox.Warning)        infoBox.setWindowTitle("Warning")        infoBox.setText("The XXX Already exist in the current Directory")        wrapper = partial(center, infoBox)        QtCore.QTimer.singleShot(0, wrapper)        infoBox.exec_()if __name__ == "__main__":    import sys    app = QtWidgets.QApplication(sys.argv)    w = Widget()    w.show()    sys.exit(app.exec_())

-QInputDialog

对于QInputDialog，QInputDialog :: getText（）方法是静态的，因此“
self.cuadro”对象不是窗口，因为该窗口是在该方法中创建的。如果将父级传递给getText（），则默认情况下它将相对于此居中。

因此，如果QMainWindow居中并假定QMainWindow是自身，则无需修改任何内容。

相反，如果父母不在屏幕上居中，则有两种可能的解决方案：

• 不要使用静态方法并通过QInputDialog实例实现逻辑：

  from functools import partial
  from PyQt5 import QtCore, QtWidgets
  

  def center(window):
  # https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen

  window.setGeometry(    QtWidgets.QStyle.alignedRect(        QtCore.Qt.LeftToRight,        QtCore.Qt.AlignCenter,        window.size(),        QtWidgets.qApp.desktop().availableGeometry(),    ))

  class Widget(QtWidgets.QWidget):
  def init(self, parent=None):
  super().init(parent)

      self.btn_inputdialog = QtWidgets.QPushButton(        "Open QInputDialog", clicked=self.open_qinputdialog    )    lay = QtWidgets.QVBoxLayout(self)    lay.addWidget(self.btn_inputdialog)    center(self)@QtCore.pyqtSlot()def open_qinputdialog(self):    dialog = QtWidgets.QInputDialog(self)    dialog.setWindowTitle("New File")    dialog.setLabelText("File Name:")    dialog.setTextEchoMode(QtWidgets.QLineEdit.Normal)    dialog.setTextValue("")    wrapper = partial(center, dialog)    QtCore.QTimer.singleShot(0, wrapper)    text, okPressed = (        dialog.textValue(),        dialog.exec_() == QtWidgets.QDialog.Accepted,    )    if okPressed and text:        print(text)

  if name == “main”:
  import sys

  app = QtWidgets.QApplication(sys.argv)w = Widget()w.show()sys.exit(app.exec_())

• 继续使用静态方法，并使用findChildren（）获取窗口

  from functools import partial
  from PyQt5 import QtCore, QtWidgets

  def center(window):
  # https://wiki.qt.io/How_to_Center_a_Window_on_the_Screen

  window.setGeometry(    QtWidgets.QStyle.alignedRect(        QtCore.Qt.LeftToRight,        QtCore.Qt.AlignCenter,        window.size(),        QtWidgets.qApp.desktop().availableGeometry(),    ))

  class Widget(QtWidgets.QWidget):
  def init(self, parent=None):
  super().init(parent)

      self.btn_inputdialog = QtWidgets.QPushButton(        "Open QInputDialog", clicked=self.open_qinputdialog    )    lay = QtWidgets.QVBoxLayout(self)    lay.addWidget(self.btn_inputdialog)    center(self)@QtCore.pyqtSlot()def open_qinputdialog(self):    parent = self    dialogs = parent.findChildren(QtWidgets.QInputDialog)    def onTimeout():        dialog, *_ = set(parent.findChildren(QtWidgets.QInputDialog)) - set(dialogs)        center(dialog)    QtCore.QTimer.singleShot(0, onTimeout)    text, okPressed = QtWidgets.QInputDialog.getText(        parent, "New File", "File Name:", QtWidgets.QLineEdit.Normal, ""    )    if okPressed and text:        print(text)

  if name == “main”:
  import sys

  app = QtWidgets.QApplication(sys.argv)w = Widget()w.show()sys.exit(app.exec_())