Tkinter按钮未定义,因为它存在于函数中

时间:2019-01-05 05:10:53

标签: python tkinter

我要做什么:

我希望按钮Confirmar一旦被单击就消失,因此我将其重定向到了应该触发销毁过程的功能dConfirm

正在发生的事情:

该按钮的定义功能与销毁过程不同,因此返回的是未定义错误

我的代码:

def dSim():
    btn3=Button(janela, text= "Hipertensao arterial", command = add1) 
    btn3.place(x = 80, y = 219)
    btn4=Button(janela, text= "Pedras nos rins", command = add2) 
    btn4.place(x = 200, y = 219)
    btn5=Button(janela, text= "Osteoporose", command = add3) 
    btn5.place(x = 295, y = 219)
    btn6=Button(janela, text= "Colesterol elevado", command = add4) 
    btn6.place(x = 378, y = 219)
    btn7=Button(janela, text= "Esclerose multipla", command = add5) 
    btn7.place(x = 492, y = 219)
    btn.destroy()
    btn2.destroy()
    lb7=Label(janela, text= "Selecione as suas doencas:", font = ("Verdana", "14"))
    lb7.place(x = 185, y = 190)
    btn8=Button(janela, text= "Confirmar", command = dConfirm) 
    btn8.place(x = 80, y = 240)

def dNao():
    lb5=Label(janela, text=Gperf, font = ("Verdana", "14"))
    lb5.place(x = 80, y = 165)
    btn.destroy()
    btn2.destroy()
    lb6=Label(janela, text="E perfeitamente saudavel, otimo!", font = ("Verdana", "14"))
    lb6.place(x = 185, y = 190)

def dConfirm():
    btn8.destroy()

2 个答案:

答案 0 :(得分:3)

您有三个选择:

  1. btn8 local 变量,因此您不能在其范围之外引用它。您可以将其设置为全局

  2. 不是直接调用dConfirm(),而是使用lambda将按钮实例传递给它,如下所示: btn8 = Button(janela, text="Confirmar", command=lambda: dConfirm(btn8))并将函数定义更改为def dConfirm(btn8):(如果您不想移至选项3并修改代码,我希望这样做)

  3. 如果您使用的是类,请使用self.btn8将其作为类的实例,然后使用self.btn8.destroy()将其销毁。

答案 1 :(得分:1)

#1 ,您可以尝试以下操作:

import tkinter as tk
root = tk.Tk()
frame = tk.Frame(root)
frame.grid(row=0, column=0, padx=4, pady=4)

# destroy the button on dConfirm function call
def dConfirm():
    btn8.destroy()

# Declare btn8 outside of the two function
btn8 = tk.Button(frame, text="Confirmar", command=dConfirm)

# Place btn8 inside the function you want
def dSim():
    btn8.grid(row=0, column=0, padx=4, pady=4)
dSim()
root.mainloop()

#2 ,您也可以尝试一下(我认为这样更好):

import tkinter as tk

class MainWindow:
    def __init__(self, master):
        self.master = master

        self.frame = tk.Frame(self.master)
        self.frame.grid(row=0, column=0, padx=4, pady=4)
        self.dSim()

    def dConfirm(self):
        self.btn8.destroy()

    def dSim(self):
        self.btn8 = tk.Button(self.frame, text="Confirmar", command=self.dConfirm)
        self.btn8.grid(row=0, column=0, padx=4, pady=4)

def main():
    root = tk.Tk()
    app = MainWindow(root)
    root.mainloop()

if __name__ == '__main__':
    main()