PyQt5 QSpinBox – 根据用户删除

在本文中，我们将看到如何在用户命令时删除微调框，在设计应用程序时，如果在关闭小部件时不小心，它可能会消耗大量空间/内存。基于 QObject 的类被设计为（可选地）在层次结构中链接在一起。当一个顶级对象被删除时，Qt 也会自动删除它的所有子对象。

为了显式删除旋转框的引用，我们使用deletLater方法。

Syntax : spin_box.deleteLater()

Argument : It takes no argument

Action performed : It deletes/remove the reference of the spin box from the memory.

编程需要懂一点英语

实施步骤：
1.创建一个旋转框
2.创建一个标签来显示旋转框状态
3.创建按钮
4. 为按钮添加动作
5.在action里面删除spin box的引用并更新label的文本

下面是实现

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
  
        # creating spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 150, 40)
  
        # setting suffix to spin
        self.spin.setSuffix(" Spin Box")
  
        # creating label
        self.label = QLabel(self)
  
        # setting geometry
        self.label.setGeometry(100, 200, 300, 40)
  
        # setting text to the label
        self.label.setText("Spin box will delete when button get pressed")
  
        # creating a push button
        push = QPushButton("Press", self)
  
        # adding action to the push button
        push.pressed.connect(self.push_method)
  
    # method called by push button
    def push_method(self):
  
        # deleting the spin box
        self.spin.deleteLater()
  
        # showing this new name to label
        self.label.setText("Spin box is deleted")
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：