Python 2.7 Tkinter-确定已选择哪个单选按钮

Question

假设已编写以下代码：

self.firstRadioButton = Radiobutton(self.__canvas, text="ONE", fg='white', bg=BACKGROUND_COLOR, variable=self.selectedONE, value=1)

self.secondRadioButton = Radiobutton(self.__canvas, text="TWO", fg='white', bg=BACKGROUND_COLOR, variable=self.selectedTWO, value=2)

我试图确定已选择哪个单选按钮，然后提取用户选择的那个单选按钮的值。我该怎么做呢？

Answer 1

关键是要确保两个单选按钮共享相同的变量。然后，要知道选择了哪个变量，您只需要获取变量的值即可。

这是一个例子：

import tkinter

# function that is called when you select a certain radio button
def selected():
    print(var.get())


root = tkinter.Tk()

var = tkinter.StringVar() #used to get the 'value' property of a tkinter.Radiobutton

# Note that I added a command to each radio button and a different 'value'
# When you press a radio button, its corresponding 'command' is called.
# In this case, I am linking both radio buttons to the same command: 'selected'

rb1 = tkinter.Radiobutton(text='Radio Button 1', variable=var, 
                          value="Radio 1", command=selected)
rb1.pack()
rb2 = tkinter.Radiobutton(text='Radio Button 2', variable=var, 
                          value="Radio 2", command=selected)
rb2.pack()

root.mainloop()