我想修改以下代码：在tkinter中的两个帧之间切换。我将三个类放在三个独立的文件中，但当我从pageOne.py调用master.switch_frame(master.StartPage(时，会出现错误：return getattr(self.tk，attr(AttributeError:"_tkinter.tkapp"对象没有属性"StartPage">
有人能帮我纠正这个错误吗？我很感激你的建议。
代码是：
主.py
#take from: https://stackoverflow.com/questions/7546050/switch-between-two-frames-in-tkinter
# Multi-frame tkinter application v2.3
import tkinter as tk
import pageOne as p1
import pageTwo as p2
class SampleApp(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self._frame = None
self.switch_frame(StartPage)
def switch_frame(self, frame_class):
"""Destroys current frame and replaces it with a new one."""
new_frame = frame_class(self)
if self._frame is not None:
self._frame.destroy()
self._frame = new_frame
self._frame.pack()
class StartPage(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is the start page").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Open page one",
command=lambda: master.switch_frame(p1.PageOne)).pack()
tk.Button(self, text="Open page two",
command=lambda: master.switch_frame(p2.PageTwo)).pack()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
pageOne.py
# Multi-frame tkinter application v2.3
import tkinter as tk
class PageOne(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is page one").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Return to start page",
command=lambda: master.switch_frame(master.StartPage)).pack()
if __name__ == "__main__":
app = PageOne()
app.mainloop()# Multi-frame tkinter application v2.3
import tkinter as tk
class PageOne(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is page one").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Return to start page",
command=lambda: master.switch_frame(master.StartPage)).pack()
if __name__ == "__main__":
app = PageOne()
app.mainloop()
enter code here
pageTwo.py
# Multi-frame tkinter application v2.3
import tkinter as tk
class PageTwo(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is page two").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Return to start page",
command=lambda: master.switch_frame(master.StartPage)).pack()
if __name__ == "__main__":
app = PageTwo()
app.mainloop()
谢谢Bryan Oakley。最后，有效的代码是：
主.py
#take from: https://stackoverflow.com/questions/7546050/switch-between-two-frames-in-tkinter
# Multi-frame tkinter application v2.3
import tkinter as tk
from StartPage import StartPage
from pageOne import PageOne
from pageTwo import PageTwo
pages = {
"StartPage": StartPage,
"PageOne": PageOne,
"PageTwo": PageTwo
}
class SampleApp(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
self._frame = None
self.switch_frame("StartPage")
def switch_frame(self, page_name):
"""Destroys current frame and replaces it with a new one."""
cls = pages[page_name]
new_frame = cls(master = self)
if self._frame is not None:
self._frame.destroy()
self._frame = new_frame
self._frame.pack()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
pageOne.py
# Multi-frame tkinter application v2.3
import tkinter as tk
class PageOne(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is page one").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Return to start page", command=lambda: master.switch_frame("StartPage")).pack()
if __name__ == "__main__":
app = PageOne()
app.mainloop()
pageTwo.py
# Multi-frame tkinter application v2.3
import tkinter as tk
class PageTwo(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is page two").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Return to start page", command=lambda: master.switch_frame("StartPage")).pack()
if __name__ == "__main__":
app = PageTwo()
app.mainloop()
开始页面.py
# Multi-frame tkinter application v2.3
import tkinter as tk
class StartPage(tk.Frame):
def __init__(self, master):
tk.Frame.__init__(self, master)
tk.Label(self, text="This is the start page").pack(side="top", fill="x", pady=10)
tk.Button(self, text="Open page one", command=lambda: master.switch_frame("PageOne")).pack()
tk.Button(self, text="Open page two", command=lambda: master.switch_frame("PageTwo")).pack()
我建议将字符串作为参数传递给show_frame。这样，其他文件就不需要导入所有其他类。然后可以创建一个映射供switch_frame使用。该文件成为唯一需要导入其他页面的文件。
它应该看起来像下面的代码。在本例中，为了保持一致性，我将StartPage移动到一个单独的文件中：
from startPage import StartPage
from pageOne import PageOne
from pageTwo import PageTwo
pages = {
"StartPage": StartPage,
"PageOne": PageOne,
"PageTwo": PageTwo
}
class SampleApp(tk.Tk):
...
def switch_frame(self, page_name):
"""Destroys current frame and replaces it with a new one."""
cls = pages[page_name]
new_frame = cls(master=self)
...
你的其他页面不需要导入页面，他们只需要使用页面名称：
class PageTwo(tk.Frame):
def __init__(self, master):
...
tk.Button(..., command=lambda: master.switch_frame("StartPage")).pack()