PyQt5 - 创建字符串旋转框

在本文中，我们将看到如何创建具有字符串值的旋转框，默认情况下，旋转框仅包含整数值。字符串旋转框是一个旋转框，它具有从给定字符串值中选择的字符串值。

为了创建字符串旋转框，我们创建了一个继承 QSpinBox 类的自定义类，下面是字符串旋转框类语法

# custom class for String Spin Box
class StringBox(QSpinBox):

    # constructor
    def __init__(self, parent=None):
        super(StringBox, self).__init__(parent)

        # string values
        strings = ["a", "b", "c", "d", "e", "f", "g"]

        # calling setStrings method
        self.setStrings(strings)

    # method setString
    # similar to set value method
    def setStrings(self, strings):

        # making strings list
        strings = list(strings)

        # making tuple from the string list
        self._strings = tuple(strings)

        # creating a dictionary
        self._values = dict(zip(strings, range(len(strings))))

        # setting range to it the spin box
        self.setRange(0, len(strings)-1)

    # overwriting the textFromValue method
    def textFromValue(self, value):
        
        # returning string from index
        # _string = tuple
        return self._strings[value]

解释：这个类的基本思想是我们创建一个自定义类，它继承了旋转框类，这就是为什么它具有普通旋转框的所有能力，但它不是显示整数而是显示字符串值。我们创建了字典，使得每个字符串都有一个整数键，旋转框的范围是字符串值的数量，并且在覆盖 textFromValue 方法的帮助下，它显示字符串而不是整数。

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
  
# custom class for String Spin Box
class StringBox(QSpinBox):
  
    # constructor
    def __init__(self, parent = None):
        super(StringBox, self).__init__(parent)
  
        # string values
        strings = ["a", "b", "c", "d", "e", "f", "g"]
  
        # calling setStrings method
        self.setStrings(strings)
  
    # method setString
    # similar to set value method
    def setStrings(self, strings):
  
        # making strings list
        strings = list(strings)
  
        # making tuple from the string list
        self._strings = tuple(strings)
  
        # creating a dictionary
        self._values = dict(zip(strings, range(len(strings))))
  
        # setting range to it the spin box
        self.setRange(0, len(strings)-1)
  
    # overwriting the textFromValue method
    def textFromValue(self, value):
  
        # returning string from index
        # _string = tuple
        return self._strings[value]
  
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 a string spin box
        string_spin_box = StringBox(self)
  
        # setting geometry to the spin box
        string_spin_box.setGeometry(100, 100, 200, 40)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：