Question

我有一个简单的例子：

from PyQt5.QtWidgets import QDialog,QFileDialog
from PyQt5.uic import loadUi
from PyQt5.QtCore import pyqtSlot, pyqtSignal 


class LoadDialog(QDialog):
    completed = pyqtSignal()

    def __init__(self, parent=None):
        super(LoadDialog, self).__init__(parent)
        loadUi("trinity/loaddlg.ui", self)

    @pyqtSlot()
    def on_btnLoad_clicked(self):
        print("Button Clicked")
        self.completed.emit()            
        self.close()


class LoadController():
    def __init__(self, parent=None):
        super(LoadController, self).__init__(parent)
        self.getLoaderFiles();

    def getLoaderFiles(self):
        loader = LoadDialog(self)
        loader.completed.connect(self.loadData)
        loader.show()

    def loadData(self):
        print("Should See Signal Here!)

我得到的是“单击按钮”输出，而不是“应该在这里看到信号”输出。似乎没有发出完成的信号，或者呼叫类未正确连接到事件。有人可以吗告诉我这段代码是怎么回事？

编辑： 用户界面文件：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>loaddlg</class>
 <widget class="QDialog" name="loaddlg">
  <property name="windowModality">
   <enum>Qt::WindowModal</enum>
  </property>
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>597</width>
    <height>173</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Trinity Pain Management Payment Summary</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <layout class="QVBoxLayout" name="verticalLayout_2">
     <item alignment="Qt::AlignTop">
      <widget class="QLabel" name="label">
       <property name="font">
        <font>
         <weight>75</weight>
         <bold>true</bold>
        </font>
       </property>
       <property name="text">
        <string>Select The Charge File:</string>
       </property>
      </widget>
     </item>
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout">
       <item>
        <widget class="QLineEdit" name="txtChgFileName"/>
       </item>
       <item>
        <widget class="QToolButton" name="btnChgFileName">
         <property name="text">
          <string>...</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
    </layout>
   </item>
   <item>
    <layout class="QVBoxLayout" name="verticalLayout_3">
     <item alignment="Qt::AlignTop">
      <widget class="QLabel" name="label_2">
       <property name="font">
        <font>
         <weight>75</weight>
         <bold>true</bold>
        </font>
       </property>
       <property name="text">
        <string>Select The Payment File:</string>
       </property>
      </widget>
     </item>
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout_2">
       <item>
        <widget class="QLineEdit" name="txtPayFileName"/>
       </item>
       <item>
        <widget class="QToolButton" name="btnPayFileName">
         <property name="text">
          <string>...</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
    </layout>
   </item>
   <item>
    <layout class="QHBoxLayout" name="horizontalLayout_3">
     <item>
      <spacer name="horizontalSpacer">
       <property name="orientation">
        <enum>Qt::Horizontal</enum>
       </property>
       <property name="sizeHint" stdset="0">
        <size>
         <width>40</width>
         <height>20</height>
        </size>
       </property>
      </spacer>
     </item>
     <item alignment="Qt::AlignRight">
      <widget class="QPushButton" name="btnLoad">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="text">
        <string>Load</string>
       </property>
      </widget>
     </item>
     <item alignment="Qt::AlignRight">
      <widget class="QPushButton" name="btnCancel">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="text">
        <string>Cancel</string>
       </property>
      </widget>
     </item>
    </layout>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

使用QT Creator设计对话框窗口。

Answer 1

我在您的代码中看到了一些不一致之处：

LoadController不会从任何人继承，因此我不理解您在父级上花费了多少：super(LoadController, self).__init__(parent)
LoadDialog希望以父级形式接收QWidget，但LoadController不是QWidget，因此它应该引发错误。

考虑到上述情况，并且除非函数的作用域更大，否则函数完成时将消除局部变量，因此，对于该对话而言，持久存在的对话必须是该类的成员。

from PyQt5.QtWidgets import QDialog,QFileDialog, QApplication
from PyQt5.uic import loadUi
from PyQt5.QtCore import pyqtSlot, pyqtSignal 


class LoadDialog(QDialog):
    completed = pyqtSignal()

    def __init__(self, parent=None):
        super(LoadDialog, self).__init__(parent)
        loadUi("trinity/loaddlg.ui", self)

    @pyqtSlot()
    def on_btnLoad_clicked(self):
        print("Button Clicked")
        self.completed.emit()            
        self.close()


class LoadController():
    def __init__(self):
        super(LoadController, self).__init__()
        self.getLoaderFiles();

    def getLoaderFiles(self):
        self.loader = LoadDialog()
        self.loader.completed.connect(self.loadData)
        self.loader.show()

    def loadData(self):
        print("Should See Signal Here!")

if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)
    controller = LoadController()
    sys.exit(app.exec_())

防止窗口关闭的另一种方法是使用exec_()阻止函数的输出：

def getLoaderFiles(self):
    loader = LoadDialog()
    loader.completed.connect(self.loadData)
    loader.exec_()

PyQt5信号发射不起作用

1 个答案: