Question

我希望有两个功能，我可以在其中轻松切换帧。我可以删除“go”框架，但我不确定如何在之后显示另一个框架。

from tkinter import *

class Trip:
    def __init__(self, parent):
        self.go = Frame(parent, width=500, height=450)
        self.go.grid(row=0, column=0)
        self.go.grid_propagate(0)  # to reserve space required for frame
        menuButton = Button(self.go, text="Continue", command=self.menuScreen)
         menuButton.grid(row=1, column=0)


    def menuScreen(self):
        self.go.grid_remove()
        self.menu = Frame(parent, width=500, height=450, bg='orchid')
        self.menu.grid(row=0, column=0)
        self.menu.grid_propagate(0)  # to reserve space required for frame

        self.addMore = Button(self.menuScreen, text="Return", command=self.__init__)
        self.addmore.grid(row=1, column=0)


if __name__ == "__main__":
    root = Tk()
    root.title("Traveller Details")
    play = Trip(root)
    root.geometry("500x450+0+0")
    root.mainloop()

Answer 1

parent的范围似乎仅限于constructor初始化。您在parent函数中再次呼叫menuScreen。

尝试在类parent中定义局部变量，并将parent1作为参数传递给构造函数。这样，parent属性在整个班级中都可见。

我可以使用上面的内容进入下一个屏幕，但是我遇到了一些其他问题，我认为这些问题可能依赖于代码的其他部分而未在此处提供。

这是修改后的代码。

from tkinter import *

class Trip:
    def __init__(self, parent1):
        self.parent = parent1
        self.go = Frame(self.parent, width=500, height=450)
        self.go.grid(row=0, column=0)
        self.go.grid_propagate(0)  # to reserve space required for frame
        menuButton = Button(self.go, text="Continue", command=self.menuScreen)
        menuButton.grid(row=1, column=0)


    def menuScreen(self):
        self.go.grid_remove()
        self.menu = Frame(self.parent, width=500, height=450, bg='orchid')
        self.menu.grid(row=0, column=0)
        self.menu.grid_propagate(0)  # to reserve space required for frame

        self.addMore = Button(self.menuScreen, text="Return", command=self.__init__)
        self.addmore.grid(row=1, column=0)


if __name__ == "__main__":
    root = Tk()
    root.title("Traveller Details")
    play = Trip(root)
    root.geometry("500x450+0+0")
    root.mainloop()

<强>输出：

Answer 2

您需要先在__init__中创建两个帧;然后用第一帧显示tk窗口。

每个框架上的可点击按钮允许您在两个框架之间来回切换。

"""
demonstrate switching back and forth between tkinter frames
"""

import tkinter as tk

class Trip:
    """
    A class to demonstrate switching back and forth between tkinter frames
    """

    def __init__(self, parent):
        self.parent = parent
        self.parent.title("Traveller Details")
        self.parent.geometry("500x450+0+0")        

        self.go_frame = tk.Frame(self.parent, width=500, height=450, bg='light blue')
        self.goto_menu_frame_button = tk.Button(self.go_frame, text="Continue", command=self.menu_screen)

        self.menu_frame = tk.Frame(self.parent, width=500, height=450, bg='light steel blue')
        self.goto_go_frame_button = tk.Button(self.menu_frame, text="Return", command=self.go_screen)

        self.current_frame = None
        self.go_screen()

    def go_screen(self):
        """
        The first screen to be visible - has a clickable button to switch 
        to the other screen 
        """
        self.remove_current_frame()
        self.current_frame = self.go_frame
        self.go_frame.grid(row=0, column=0)
        self.go_frame.grid_propagate(0)  # to reserve space required for frame
        self.goto_menu_frame_button.grid(row=1, column=0)

    def menu_screen(self):
        """
        The second screen - has a clickable button to switch back to the first screen 
        """
        self.remove_current_frame()
        self.current_frame = self.menu_frame
        self.menu_frame.grid(row=0, column=0)
        self.menu_frame.grid_propagate(0)  # to reserve space required for frame
        self.goto_go_frame_button.grid(row=0, column=0)

    def remove_current_frame(self):
        """
        removes the current frame from the grid if it exists
        """
        if self.current_frame is not None:
            self.current_frame.grid_remove()

    def start(self):
        """
        launches the GUI
        """
        self.parent.mainloop()


if __name__ == "__main__":
    trip = Trip(tk.Tk())
    trip.start()

用函数在python中的帧之间切换

2 个答案: