将小部件添加到从 .ui 文件创建的布局

Question

我正在使用 PySide2 在 Python 中创建一个 GUI，这是我的 .ui 文件：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>main_window</class>
 <widget class="QWidget" name="main_window">
  <property name="windowModality">
   <enum>Qt::NonModal</enum>
  </property>
  <property name="enabled">
   <bool>true</bool>
  </property>
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>1000</width>
    <height>640</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Testing App</string>
  </property>
  <layout class="QVBoxLayout" name="layout">
   <item>
    <layout class="QVBoxLayout" name="other_layout">
     <item>
      <widget class="QWidget" name="panel" native="true">
       <layout class="QHBoxLayout" name="layout3">
        <item>
         <layout class="QVBoxLayout" name="layout4">
          <item>
           <layout class="QHBoxLayout" name="layout5">
            <item>
             <widget class="QLabel" name="lo">
              <property name="text">
               <string>X</string>
              </property>
              <property name="alignment">
               <set>Qt::AlignCenter</set>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QLineEdit" name="resolution_x">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="inputMethodHints">
               <set>Qt::ImhDigitsOnly</set>
              </property>
              <property name="text">
               <string>175</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
          <item>
           <layout class="QHBoxLayout" name="layout6">
            <item>
             <widget class="QLabel" name="lo2">
              <property name="text">
               <string>Y</string>
              </property>
              <property name="alignment">
               <set>Qt::AlignCenter</set>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QLineEdit" name="res2">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="inputMethodHints">
               <set>Qt::ImhDigitsOnly</set>
              </property>
              <property name="text">
               <string>150</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
         </layout>
        </item>
        <item>
         <layout class="QVBoxLayout" name="layout7">
          <item>
           <layout class="QHBoxLayout" name="iterations_layout">
            <item>
             <widget class="QLabel" name="iterLab">
              <property name="text">
               <string>Num Passes</string>
              </property>
              <property name="alignment">
               <set>Qt::AlignCenter</set>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QLineEdit" name="itr">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="inputMethodHints">
               <set>Qt::ImhDigitsOnly</set>
              </property>
              <property name="text">
               <string>20</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
          <item>
           <layout class="QHBoxLayout" name="layout8">
            <item>
             <widget class="QPushButton" name="reset_button">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="minimumSize">
               <size>
                <width>50</width>
                <height>0</height>
               </size>
              </property>
              <property name="layoutDirection">
               <enum>Qt::LeftToRight</enum>
              </property>
              <property name="text">
               <string>Zoom</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
         </layout>
        </item>
       </layout>
      </widget>
     </item>
     <item>
      <layout class="QHBoxLayout" name="process_layout">
       <item alignment="Qt::AlignLeft">
        <widget class="QLabel" name="status">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
         <property name="minimumSize">
          <size>
           <width>120</width>
           <height>20</height>
          </size>
         </property>
         <property name="maximumSize">
          <size>
           <width>120</width>
           <height>20</height>
          </size>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="alignment">
          <set>Qt::AlignCenter</set>
         </property>
        </widget>
       </item>
       <item alignment="Qt::AlignRight">
        <widget class="QLabel" name="procLab">
         <property name="minimumSize">
          <size>
           <width>77</width>
           <height>20</height>
          </size>
         </property>
         <property name="maximumSize">
          <size>
           <width>77</width>
           <height>20</height>
          </size>
         </property>
         <property name="text">
          <string>#</string>
         </property>
        </widget>
       </item>
       <item alignment="Qt::AlignRight">
        <widget class="QLineEdit" name="processes">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
         <property name="minimumSize">
          <size>
           <width>50</width>
           <height>0</height>
          </size>
         </property>
         <property name="maximumSize">
          <size>
           <width>50</width>
           <height>2000</height>
          </size>
         </property>
         <property name="inputMethodHints">
          <set>Qt::ImhDigitsOnly</set>
         </property>
         <property name="text">
          <string>8</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
    </layout>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

我想从我的 Python 脚本动态添加一个小部件到主布局 ('layout'):

app = QApplication(sys.argv)
f = MyWindow()
sys.exit(app.exec_())

class MyWindow(QWidget):
    def __init__(self):
        super(MyWindow, self).__init__(None)
        ui_file = QtCore.QFile("./myui.ui")
        ui_file.open(QtCore.QFile.ReadOnly)
        loader = QtUiTools.QUiLoader()
        self.window = loader.load(ui_file)
        ui_file.close()

        self.layout.addWidget(QLabel('Stuff'))

        self.window.show()

但是，我收到以下错误

    self.layout.addWidget(QLabel('Stuff'))
AttributeError: 'builtin_function_or_method' object has no attribute 'addWidget'

我不明白为什么 self.layout 没有属性 addWidget。我以为 self.layout 会引用 QVBoxLayout 对象？

Answer 1

您有几个错误：

从 .ui 加载的小部件不是 MyWindow，另一方面，在 PySide2 中不可能将 .ui 加载到小部件 class 由 python 实现（在 PyQt5 中，如果可能，通过 uic.loadUi()）所以 class 应该处理小部件。
另一方面，不要使用可能与方法名冲突的变量名，例如QWidget class有一个布局方法，所以不建议你有一个具有该名称的属性，一个可能的解决方案是使用 findChild 来获取布局：

import sys

from PySide2.QtCore import QObject, QFile
from PySide2.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
from PySide2.QtUiTools import QUiLoader


class Manager(QObject):
    def __init__(self):
        super(Manager, self).__init__(None)
        ui_file = QFile("./myui.ui")
        ui_file.open(QFile.ReadOnly)
        loader = QUiLoader()
        self.window = loader.load(ui_file)
        ui_file.close()
        lay = self.window.findChild(QVBoxLayout, "layout")
        lay.addWidget(QLabel("Stuff"))

        self.window.show()


if __name__ == "__main__":

    app = QApplication(sys.argv)
    f = Manager()
    sys.exit(app.exec_())

另一种可能的解决方案是将布局的名称更改为例如 vlayout：<layout class="QVBoxLayout" name="vlayout">

import sys

from PySide2.QtCore import QObject, QFile
from PySide2.QtWidgets import QApplication, QLabel, QWidget
from PySide2.QtUiTools import QUiLoader


class Manager(QObject):
    def __init__(self):
        super(Manager, self).__init__(None)
        ui_file = QFile("./myui.ui")
        ui_file.open(QFile.ReadOnly)
        loader = QUiLoader()
        self.window = loader.load(ui_file)
        ui_file.close()
        self.window.vlayout.addWidget(QLabel("Stuff"))

        self.window.show()


if __name__ == "__main__":

    app = QApplication(sys.argv)
    f = Manager()
    sys.exit(app.exec_())

将小部件添加到从 .ui 文件创建的布局

Adding a widget to a layout created from .ui file

python

pyside2