通过另一个框架函数tkinter更改框架中的按钮属性

Question

我对python和tkinter完全陌生，因此我想向某人寻求帮助。我准备了一个多帧tkinter应用程序的GUI应用程序。我的问题是，我想改变btn1属性，例如背景在frame1按下btn2在frame2，它不工作，我完全沮丧的问题在哪里这是我的代码

#-----------------------------------------------------------
from tkinter import *
import tkinter as tk            
state=0
class SmartApp(tk.Tk):
def __init__(self, *args,**kwargs):
tk.Tk.__init__(self,*args,**kwargs)
tk.Tk.wm_geometry(self,"800x480")

container=tk.Frame(self)
container.pack(side="top", fill="both", expand= True)
container.grid_rowconfigure(0,weight=1)
container.grid_columnconfigure(0,weight=1)
self.frames= {}  #dictionary for frames, contain the list of frames
for frames in (Frame1,Frame2):
page_name=frames.__name__
frame=frames(parent=container,controller=self)
self.frames[page_name]=frame
frame.grid(row=0,column=0 , sticky="nsew") #
self.show_frame("Frame1")
def show_frame(self,cont):
frame=self.frames[cont]
frame.tkraise() # raise to the front

class Frame1(tk.Frame):
def __init__(self,parent,controller):
tk.Frame.__init__(self,parent)
self.controller=controller
global state
label=tk.Label(self,text="Frame1")
label.place(x=50,y=50)
btn_1=tk.Button(self,text="go to Frame2", command=lambda:controller.show_frame("Frame2"))
btn_1.place(x=500,y=200)

if state==1:
btn_1.configure(bg='green') # this I wolud reach
class Frame2(tk.Frame):
def __init__(self,parent,controller):
tk.Frame.__init__(self,parent)
self.controller=controller
right_frame=tk.Frame(self,bg='#FF0000')
right_frame.pack(side=RIGHT,expand=YES, fill=BOTH)
left_frame = tk.Frame(self, bg='#00FF00')
left_frame.pack(side=LEFT, expand=YES, fill=BOTH)
main_menu_btn = tk.Button(right_frame, text="back to Frame1", command=self.hide)
main_menu_btn.place(x=240, y=300)

btn_2=tk.Button(right_frame, text="Change",command=lambda:self.activate) # with this I would like to change btn_1 background
btn_2.grid(row=0, rowspan=2, column=3)
def activate(self):
global state
state=1
return (state)

def hide(self):
self.controller.show_frame("Frame1")

if __name__ == "__main__":
app = SmartApp()
app.mainloop()

Answer 1

试试这个:

import tkinter as tk

class SmartApp(tk.Tk):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
super().wm_geometry("800x480")

container = tk.Frame(self)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}  #dictionary for frames, contain the list of frames
for Frame in (Frame1, Frame2):
frame = Frame(container, controller=self)
frame.grid(row=0, column=0, sticky="news")
self.frames.update({Frame.__name__: frame})
self.show_frame("Frame1")
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise() # raise to the front

class Frame1(tk.Frame):
def __init__(self, master, controller):
super().__init__(master)
self.controller = controller
self.label = tk.Label(self, text="Frame1")
self.label.place(x=50, y=50)
self.btn_1 = tk.Button(self, text="go to Frame2",
command=lambda: controller.show_frame("Frame2"))
self.btn_1.place(x=500, y=200)

def change_btn_bg(self):
self.btn_1.configure(bg="green")

class Frame2(tk.Frame):
def __init__(self, master, controller):
super().__init__(master)
self.controller = controller
right_frame = tk.Frame(self, bg="#FF0000")
right_frame.pack(side="right", expand=True, fill="both")
left_frame = tk.Frame(self, bg="#00FF00")
left_frame.pack(side="left", expand=True, fill="both")
main_menu_btn = tk.Button(right_frame, text="back to Frame1",
command=self.hide)
main_menu_btn.place(x=240, y=300)
btn_2 = tk.Button(right_frame, text="Change",
command=self.activate)
btn_2.grid(row=0, rowspan=2, column=3)
def activate(self):
# Call Frame1's `change_btn_bg` method
self.controller.frames["Frame1"].change_btn_bg()

def hide(self):
self.controller.show_frame("Frame1")

if __name__ == "__main__":
app = SmartApp()
app.mainloop()

首先，我清理了你的代码。其次，你只检查了一次state的值。如果您直接调用正确的方法，则不必使用标志。