我正在創建一個卡路里計算應用程式。動態添加和洗掉小部件時出現問題。我需要通過點擊按鈕來添加一個新產品（標簽“產品”，標簽“重量”，以及輸入產品名稱和重量的欄位。我沒有想法。告訴我如何實作這個功能？這里是代碼（它只是一個沒有實作的骨架來顯示我正在使用的內容）：
import sys # interaction with Python
from PyQt5.QtWidgets import * # for classic application based on widgets
from PyQt5 import uic # to read ui file
from PyQt5 import QtWidgets # to create gui
class MyWin(QtWidgets.QMainWindow): # create class witch inherit QMainWindow
def __init__(self): # constructor
QtWidgets.QMainWindow.__init__(self) # constructor of parent class
uic.loadUi("gui.ui", self) # load ui
if __name__ == '__main__': # for check non import module
app = QApplication(sys.argv) # create app
mw = MyWin() # create object of MyWin class
mw.show() # to show gui
sys.exit(app.exec_()) # execute app
貴：
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>458</width>
<height>234</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<widget class="QGroupBox" name="breakfest">
<property name="title">
<string>Breakfest</string>
</property>
<layout class="QVBoxLayout" name="verticalLayout_3">
<item>
<layout class="QVBoxLayout" name="verticalLayout_2">
<item>
<layout class="QHBoxLayout" name="horizontalLayout_2">
<item>
<widget class="QLabel" name="label_product">
<property name="text">
<string>Product</string>
</property>
</widget>
</item>
<item>
<widget class="QLabel" name="label_weight">
<property name="text">
<string>Weight</string>
</property>
</widget>
</item>
</layout>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QLineEdit" name="lineEdit_product"/>
</item>
<item>
<widget class="QLineEdit" name="lineEdit_weight"/>
</item>
</layout>
</item>
<item>
<spacer name="verticalSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>40</height>
</size>
</property>
</spacer>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_3">
<item>
<widget class="QPushButton" name="add_product">
<property name="text">
<string>Add product</string>
</property>
</widget>
</item>
<item>
<widget class="QPushButton" name="remove_product">
<property name="text">
<string>Remove product</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</widget>
</item>
</layout>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
uj5u.com熱心網友回復：
連接單擊的信號以添加/洗掉欄位。以下是如何使用與 ui 檔案中的第一個產品/重量欄位相同的“結構”。
class MyWin(QtWidgets.QMainWindow): # create class witch inherit QMainWindow
def __init__(self): # constructor
QtWidgets.QMainWindow.__init__(self) # constructor of parent class
uic.loadUi("gui.ui", self) # load ui
self.add_product.clicked.connect(self.add)
self.remove_product.clicked.connect(self.remove)
def add(self):
h1 = QHBoxLayout()
h1.addWidget(QLabel('Product'))
h1.addWidget(QLabel('Weight'))
h2 = QHBoxLayout()
h2.addWidget(QLineEdit())
h2.addWidget(QLineEdit())
i = self.verticalLayout_2.count()
self.verticalLayout_2.insertLayout(i - 2, h1)
self.verticalLayout_2.insertLayout(i - 1, h2)
def remove(self):
i = self.verticalLayout_2.count()
if i > 3:
QWidget().setLayout(self.verticalLayout_2.takeAt(i - 3))
QWidget().setLayout(self.verticalLayout_2.takeAt(i - 4))
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