如何将用户输入设置为另一个框架中 Tkinter 条目小部件的默认文本?

Question

我有两个框架可以切换。在每一帧中，都有一个Entry框。如何将第一个框架中第一个Entry框中的输入设置为第二个框架中第二个Entry框的默认文本？

from tkinter import *

class Root(Tk):
def __init__(self, *args, **kwargs):
Tk.__init__(self, *args, **kwargs)
container = 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 (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("PageOne")
def show_frame(self, page_name):
frame = self.frames[page_name]
frame.tkraise()
def quit(self):
self.destroy()
text = ''

class PageOne(Frame):
def __init__(self, parent, controller):
Frame.__init__(self, parent)
self.controller = controller
global text
entry_box_1 = Entry(self, width=40)
entry_box_1.pack()
text = entry_box_1.get()
quit_button = Button(self, text="Quit Program",
command=lambda: controller.quit())
next_button = Button(self, text="Next",
command=lambda: controller.show_frame('PageTwo'))
next_button.pack()
quit_button.pack()

class PageTwo(Frame):
def __init__(self, parent, controller):
Frame.__init__(self, parent)
self.controller = controller
entry_box_2 = Entry(self, width=40)
entry_box_2.insert(END, text)
entry_box_2.pack()
quit_button = Button(self, text="Quit Program",
command=lambda: controller.quit())
back_button = Button(self, text="Back",
command=lambda: controller.show_frame("PageOne"))
back_button.pack()
quit_button.pack()
if __name__ == "__main__":
root = Root()
root.mainloop()

当我切换到第二帧时，我的第二个Entry框一直为空白。

Answer 1

当变量为空字符串时text您正在初始化PageTwo帧，并且在切换到此帧时，您不会插入任何值来entry_box_2。

我建议您每次切换到PageTwo帧时都调用insert方法。可以通过创建一个新的切换方法来实现此目的，该方法可能类似于以下代码中的show_frame_with_default_text方法。

from tkinter import *

class Root(Tk):
def __init__(self, *args, **kwargs):
Tk.__init__(self, *args, **kwargs)
container = 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 (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("PageOne")
def show_frame(self, page_name):
frame = self.frames[page_name]
frame.tkraise()
def show_frame_with_default_text(self, page_name, text):
frame = self.frames[page_name]
frame.entry_box.delete(0, END)
frame.entry_box.insert(0, text)
frame.tkraise()
def quit(self):
self.destroy()

class PageOne(Frame):
def __init__(self, parent, controller):
Frame.__init__(self, parent)
self.controller = controller
entry_box_1 = Entry(self, width=40)
entry_box_1.pack()
quit_button = Button(self, text="Quit Program",
command=lambda: controller.quit())
next_button = Button(self, text="Next",
command=lambda: controller.show_frame_with_default_text('PageTwo', entry_box_1.get()))
next_button.pack()
quit_button.pack()

class PageTwo(Frame):
def __init__(self, parent, controller):
Frame.__init__(self, parent)
self.controller = controller
self.entry_box = Entry(self, width=40)
self.entry_box.pack()
quit_button = Button(self, text="Quit Program",
command=lambda: controller.quit())
back_button = Button(self, text="Back",
command=lambda: controller.show_frame("PageOne"))
back_button.pack()
quit_button.pack()

if __name__ == "__main__":
root = Root()
root.mainloop()