Question

我目前正在使用Tkinter进行一个项目，我希望在StartPage中使用按钮文本将我带到PageOne，并将按钮文本作为标签。

我尝试创建一个可更改全局变量并让PageOne访问该全局变量的函数，但由于MiniProject类仅运行一次，所以它似乎不起作用。

因此，我尝试将Tkinter字符串变量与PageOne标签相关联，但是我不确定如何执行此操作。如何将两个课程链接在一起？还是应该将PageOne作为功能放在StartPage下？

请告知。

#code layout from https://pythonprogramming.net/change-show-new-frame-tkinter/
import tkinter as tk

class MiniProject(tk.Tk): #baseline code for adding/switching pages

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, *kwargs)
        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 (StartPage, PageOne):

            frame = F(container, self)

            self.frames[F] = frame

            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(StartPage)

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()

class StartPage(tk.Frame): #Front page with buttons A-D
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)

        for letter in ["A","B","C","D"]: #clicking button should bring me to PageOne with label as button text
            button = tk.Button(self, text = letter, command = lambda j = letter:\
                                [PageOne.changename(j),controller.show_frame(PageOne)])
            button.pack()

class PageOne(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)

        my_string_var = tk.StringVar()
        my_string_var.set("Default Text")

        label = tk.Label(self, textvariable = my_string_var) #Supposed to display button number
        label.pack(pady=10,padx=10)
        button1 = tk.Button(self, text = "TO HOME", command = lambda: controller.show_frame(StartPage))
        button1.pack()
    def changename(name):
        my_string_var.set(name)

app = MiniProject()
app.mainloop()

接收回溯

Exception in Tkinter callback
Traceback (most recent call last):
  File "/Users/kohtziyong/anaconda3/lib/python3.7/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File "<ipython-input-3-3405dd392652>", line 37, in <lambda>
    [PageOne.changename(j),controller.show_frame(PageOne)])
  File "<ipython-input-3-3405dd392652>", line 52, in changename
    my_string_var.set(name)
NameError: name 'my_string_var' is not defined

通过单击按钮更改另一页中的标签

0 个答案: