如何在类1中更改类2（Tkinter）中小部件（标签）的属性？

问题描述 投票：0回答：2

我想在recordBn类中有一个MainMenu按钮，它改变了dateLb类中RecordTime标签的文本。但我一直收到如下错误信息。

AttributeError: 'RecordTime' object has no attribute 'dateLb'

使用empcbxlist()类的GFPTime

我试图从这个post和其他几个帖子解决我的问题同样的错误信息（AttributeError），但找不到解决方案。帮我解决我的错误

#!/usr/bin/python
import os.path
import sys
import tkinter as tk
from tkinter import messagebox
from tkinter import ttk
# from PIL import Image, ImageTk
# from dbfunctions import *
import datetime

class GFPTime(tk.Tk):
    def __init__(self,*args,**kwargs):

        tk.Tk.__init__(self,*args,**kwargs)

        tk.Tk.wm_title(self,"GFP Employee Timecard System")
        tk.Tk.wm_geometry(self,"800x480+0+0")

        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 = {}

        for F in (MainMenu,RecordTime):

            frame = F(container,self)

            self.frames[F] = frame
            frame.grid(row=0,column=0,stick='nsew')

        self.show_frame(MainMenu)
        # print(self.frames.values())
    def show_frame(self,cont):
        frame = self.frames[cont]
        frame.tkraise()

    def empcbxlist(self, widget_name, criteria, output):
        # db = TimeCardDB()
        # cbvalue = db.listActiveEmployees()
        # db.dbclose()

        widget = getattr(RecordTime,'dateLb')
        widget[criteria] = output

###
class MainMenu(tk.Frame):

    def __init__(self,parent,controller):
        tk.Frame.__init__(self,parent)
        #tk.Frame.configure(self,background='red')
        font9 = "-family {Minion Pro} -size 14 -weight bold"
        self.controller = controller

        recordBn = tk.Button(self,command=lambda: [self.controller.show_frame(RecordTime), self.controller.empcbxlist('self.dateLb','text','yessss')])
        recordBn.place(relx=0.269, rely=0.646, height=50, width=180)
        recordBn.configure(activebackground="#ececec")
        recordBn.configure(activeforeground="#000000")
        recordBn.configure(background="#d9d9d9")
        recordBn.configure(disabledforeground="#a3a3a3")
        recordBn.configure(font=font9)
        recordBn.configure(foreground="#000000")
        recordBn.configure(highlightbackground="#d9d9d9")
        recordBn.configure(highlightcolor="black")
        recordBn.configure(pady="0")
        recordBn.configure(text='''Record Time''')#!/usr/bin/python


class RecordTime(tk.Frame):

    def __init__(self,parent,controller):
        tk.Frame.__init__(self,parent)
        self.controller = controller
        dateLb = tk.Label(self)
        dateLb.place(relx=0.213, rely=0.021, height=38, width=144)
        dateLb.configure(activebackground="#f9f9f9")
        dateLb.configure(activeforeground="black")
        dateLb.configure(disabledforeground="#a3a3a3")
        dateLb.configure(font="-family {Minion Pro} -size 14 -weight bold")
        dateLb.configure(foreground="#000000")
        dateLb.configure(highlightbackground="#d9d9d9")
        dateLb.configure(highlightcolor="black")
        dateLb.configure(text='''SHOW DATE''')



GFPTime().mainloop()
python python-3.x tkinter widget tk
2个回答
0
投票

您的代码几乎没有问题。

  1. 当你创建一个字典self.frames并用它们的类名保存每个帧的对象然后使用字典来获取他们的方法和属性不使用像widget = getattr(RecordTime,'dateLb')这样的类名来访问它们而不是RecordTime使用你保存的类在字典里。
  2. 不要在lambda函数中给出小部件名称self.dateLb，只需dateLb即可。 更改： self.controller.empcbxlist('self.dateLb','text','yessss') 至 self.controller.empcbxlist('dateLb','text','yessss')
  3. 正如@ aw1668所说“将dateLb替换为self.dateLb类中的RecordTime”因此将dateLb标签更改为self.dateLb全球化。

我将empcbxlist()中的代码块更改为此。

def empcbxlist(self, widget_name, criteria, output):
    # db = TimeCardDB()
    # cbvalue = db.listActiveEmployees()
    # db.dbclose()

    # Get the frame. 
    ob = self.frames.get( RecordTime ) 
    widget = getattr(ob,widget_name)
    widget[criteria] = output

    # can use this to change the text to be on safe side.
    # for i, j  in self.frames.items():
    #     if i.__name__ == RecordTime.__name__:
    #         widget = getattr(j,widget_name)
    #         widget[criteria] = output

完整代码：

#!/usr/bin/python
import os.path
import sys
import tkinter as tk
from tkinter import messagebox
from tkinter import ttk
# from PIL import Image, ImageTk
# from dbfunctions import *
import datetime

class GFPTime(tk.Tk):
    def __init__(self,*args,**kwargs):

        tk.Tk.__init__(self,*args,**kwargs)

        tk.Tk.wm_title(self,"GFP Employee Timecard System")
        tk.Tk.wm_geometry(self,"800x480+0+0")

        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 = {}

        for F in (MainMenu,RecordTime):

            frame = F(container,self)

            self.frames[F] = frame
            frame.grid(row=0,column=0,stick='nsew')

        self.show_frame(MainMenu)
        # print(self.frames.values())
    def show_frame(self,cont):
        frame = self.frames[cont]
        frame.tkraise()

    def empcbxlist(self, widget_name, criteria, output):
        # db = TimeCardDB()
        # cbvalue = db.listActiveEmployees()
        # db.dbclose()

        ob = self.frames.get( RecordTime ) 
        widget = getattr(ob,widget_name)
        widget[criteria] = output

###
class MainMenu(tk.Frame):

    def __init__(self,parent,controller):
        tk.Frame.__init__(self,parent)
        #tk.Frame.configure(self,background='red')
        font9 = "-family {Minion Pro} -size 14 -weight bold"
        self.controller = controller

        recordBn = tk.Button(self,command=lambda: [self.controller.show_frame(RecordTime), self.controller.empcbxlist('dateLb','text','yessss')])
        recordBn.place(relx=0.269, rely=0.646, height=50, width=180)
        recordBn.configure(activebackground="#ececec")
        recordBn.configure(activeforeground="#000000")
        recordBn.configure(background="#d9d9d9")
        recordBn.configure(disabledforeground="#a3a3a3")
        recordBn.configure(font=font9)
        recordBn.configure(foreground="#000000")
        recordBn.configure(highlightbackground="#d9d9d9")
        recordBn.configure(highlightcolor="black")
        recordBn.configure(pady="0")
        recordBn.configure(text='''Record Time''')#!/usr/bin/python


class RecordTime(tk.Frame):

    def __init__(self,parent,controller):
        tk.Frame.__init__(self,parent)
        self.controller = controller
        self.dateLb = tk.Label(self)
        self.dateLb.place(relx=0.213, rely=0.021, height=38, width=144)
        self.dateLb.configure(activebackground="#f9f9f9")
        self.dateLb.configure(activeforeground="black")
        self.dateLb.configure(disabledforeground="#a3a3a3")
        self.dateLb.configure(font="-family {Minion Pro} -size 14 -weight bold")
        self.dateLb.configure(foreground="#000000")
        self.dateLb.configure(highlightbackground="#d9d9d9")
        self.dateLb.configure(highlightcolor="black")
        self.dateLb.configure(text='''SHOW DATE''')



GFPTime().mainloop()

希望这可以帮助。

0
投票

你的代码有点混乱，而且过于复杂。我把它缩小到一个更容易消化的大小 - 装饰只会增加代码的混乱。

请盯着它，直到你了解哪些元素正在做什么，并且可能从那里重建。

import tkinter as tk
import datetime


class GFPTime(tk.Tk):

    def __init__(self):
        super().__init__()
        super().wm_title("GFP Employee Timecard System")
        self.container = tk.Frame(self)
        self.container.pack(side='top',fill='both',expand= True)
        self.frames = {}
        for F in (MainMenu, RecordTime):    
            self.frames[F] = F(self.container, self)
            self.frames[F].grid(row=0,column=0,stick='nsew')
        self.show_frame(MainMenu)

    def show_frame(self, container):
        self.frames[container].tkraise()

    def empcbxlist(self, text_value):
        self.show_frame(RecordTime)
        self.frames[RecordTime].date_lbl.configure(text=text_value)


class MainMenu(tk.Frame):

    def __init__(self, parent, controller):
        super().__init__(parent)
        self.controller = controller
        record_btn = tk.Button(self, text='Record Time', 
                             command=lambda text_value=str(datetime.date.today()): self.controller.empcbxlist(text_value))
        record_btn.pack()


class RecordTime(tk.Frame):

    def __init__(self, parent, controller):
        super().__init__(parent)
        self.controller = controller
        self.date_lbl = tk.Label(self, text='SHOW DATE')
        self.date_lbl.pack()


GFPTime().mainloop()
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