【发布时间】：2020-08-31 20:17:21
【问题描述】：
我一直在努力通过结合书籍、在线教程以及利用本网站上的问题和示例来提高我的 Tkinter 技能。在一个脚本中，我正在努力理解和建立这个问题和流行的答案： Switch between two frames in tkinter。 我创建了一个版本，该版本允许创建页面的多个实例，跟踪为每个实例选择第 1 页的时间次数，并使用选择第 1 页的次数更新第 1 页的标签。为了减小程序的大小，显示的代码仅用于更新第 1 页标签。我只能通过在“PageOne”对象中使用全局变量和调用来显示它的方法来实现这一点。我觉得 必须有更好的方法，但我尝试的所有方法都会产生类似的错误 to : #AttributeError: '_tkinter.tkapp' object has no attribute 'label'。我想应该很简单，但我花了几天时间单独解决这个问题。
import tkinter as tk
from tkinter import font as tkfont
'''
original post
https://stackoverflow.com/questions/7546050/switch-between-two-frames-in-tkinter
'''
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")
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.Label1_Text = tk.StringVar()
self.PageOne_Ct = tk.IntVar()
#-------------------------------
self.frames = {}
for F in (StartPage, PageOne, PageTwo):
page_name = F.__name__
frame = F(parent=container, controller=self)
self.frames[page_name] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame("StartPage")
def get_lbl_text(self):
label1text = self.Label1_Text.get()
return label1text
def get_page1_cts(self):
counts = self.PageOne_Ct.get()
return counts
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="This is the start page", font=controller.title_font)
label.pack(side="top", fill="x", pady=10)
button1 = tk.Button(self, text="Go to Page One",
command=lambda: PageOne.Show_PageOne(self,
parent, controller))
button2 = tk.Button(self, text="Go to Page Two",
command=lambda: controller.show_frame("PageTwo"))
button1.pack()
button2.pack()
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
global label
self.controller = controller
label = tk.Label(self, text = self.controller.Label1_Text.get(),
font=controller.title_font)
label.pack(side="top", fill="x", pady=10)
button = tk.Button(self, text="Go to the start page",
command=lambda: controller.show_frame("StartPage"))
button.pack()
def Show_PageOne(self, parent, controller):
global label
count = self.controller.get_page1_cts()
self.controller = controller
count = self.controller.PageOne_Ct.get()
count += 1
self.controller.PageOne_Ct.set(count)
new_label1_text = "You have clicked page one {} times".format(count)
self.controller.Label1_Text.set(new_label1_text)
label.configure(text=new_label1_text)
controller.show_frame("PageOne")
class PageTwo(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label2 = tk.Label(self, text="This is page 2", font=controller.title_font)
label2.pack(side="top", fill="x", pady=10)
button = tk.Button(self, text="Go to the start page",
command=lambda: controller.show_frame("StartPage"))
button.pack()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
【问题讨论】：
标签： python object tkinter text