当 frame.place() 位于单独的行中时，tkinter 子小部件会消失在框架后面

Question

当我定义以下函数时，我在该函数内定义的所有其他小部件都会出现并且可以正常工作。我可以修改条目并从中获取值。

`

def frame(self):
    new_frm = tk.Frame(self.window,  width=200, 
        height=200, bg="white"
    ).place(x=self.x0, y=0)
    self.frame_list.append(new_frm)
    lbl = tk.Label(master=new_frm, relief=tk.RIDGE, 
               text=param_name, fg = "white", bg="black",   
               anchor="w", font=("Arial", 20)
   )
    lbl.place(x = self.x0, y = 0)
    self.x0 += 205

`

但是如果我将代码更改为下面的代码，则只会出现框架而不是小部件。但是，这些小部件仍然与第一种情况一样有效。我想知道为什么会发生这种情况以及如何解决它。

`

def frame(self):
    new_frm = tk.Frame(self.window,  
          width=200, height=200, bg="white"
    )
    new_frm.place(x=self.x0, y=0)
    new_frm = tk.Frame(self.window,  width=200, height=200, bg=color)
    self.frame_list.append(new_frm)
    lbl = tk.Label(master=new_frm, relief=tk.RIDGE, 
               text=param_name, fg = "white", bg="black",   
               anchor="w", font=("Arial", 20)
   )
    lbl.place(x = self.x0, y = 0)
    self.x0 += 205

`

我想将 new_frm 放入 frame_list 以便我以后可以访问所有帧。当然，当我使用 new_frm = tk.Frame(self.window, width=200,height=200, bg="white").place(x=self.x0, y=0) , new_frm 变成 Nonetype 并且不起作用。

更新：

@Kartikeya 提到的解决方案是对框架内的小部件使用 .grid()。因此，代码必须这样写： `

def frame(self):
    new_frm = tk.Frame(self.window,  
          width=200, height=200, bg="white"
    )
    new_frm.place(x=self.x0, y=0)
    new_frm = tk.Frame(self.window,  width=200, height=200, bg=color)
    self.frame_list.append(new_frm)
    lbl = tk.Label(master=new_frm, relief=tk.RIDGE, 
               text=param_name, fg = "white", bg="black",   
               anchor="w", font=("Arial", 20)
   )
    lbl.grid(row = 0, column = 0)
    self.x0 += 205

`

Answer 1

这是因为您在second/third中创建了两次new_frm例如：

def frame(self):
    # first "new_frm"
    new_frm = tk.Frame(self.window,  
          width=200, height=200, bg="white"
    )
    new_frm.place(x=self.x0, y=0)
    # second "new_frm" which ovrrides the above one
    # and it is invisible because it is not .pack()/grid()/place()
    new_frm = tk.Frame(self.window,  width=200, height=200, bg=color)
    self.frame_list.append(new_frm)
    # label are put in the invisible "new_frm", so it is not visible as well
    lbl = tk.Label(master=new_frm, relief=tk.RIDGE, 
               text=param_name, fg = "white", bg="black",   
               anchor="w", font=("Arial", 20)
    )
    lbl.place(x = self.x0, y = 0)
    self.x0 += 205

移除new_frm的二次创作：

def frame(self):
    new_frm = tk.Frame(self.window,
          width=200, height=200, bg="white"
    )
    new_frm.place(x=self.x0, y=0)
    # below line should not be called
    #new_frm = tk.Frame(self.window,  width=200, height=200, bg=color)
    self.frame_list.append(new_frm)
    lbl = tk.Label(master=new_frm, relief=tk.RIDGE,
               text=param_name, fg = "white", bg="black",
               anchor="w", font=("Arial", 20)
    )
    lbl.place(x = self.x0, y = 0)
    self.x0 += 205

当 frame.place() 位于单独的行中时，tkinter 子小部件会消失在框架后面

tkinter child widgets disappear behind the frame when frame.place() is position in a separate line

python

tkinter

widget