Tkinter更新多组件GUI时出现闪烁，如何实现无闪烁更新？

能否在更新Frame（销毁现有组件并创建新组件）时避免闪烁？

实际应用为动态表单（数十行选项，选项会引发表单内容变化），发现异常现象：刷新相同内容时会出现闪烁，但新增组件时同样执行销毁重建操作却无闪烁。点击示例中的A、B、A、A等按钮可观察到明显闪烁，期望实现类似图片切换的即时效果。

附简化示例代码：

import tkinter as tk


class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.geometry('400x900')
        self.resizable(width=0, height=0)
        self.grid_rowconfigure(1, weight=1)
        self.grid_columnconfigure(0, weight=1, uniform='a')
        self.grid_columnconfigure(1, weight=1, uniform='a')
        self.grid_columnconfigure(2, weight=1, uniform='a')
        tk.Button(text='A', command=lambda: self.add(20)).grid(row=0, column=0, sticky='nsew')
        tk.Button(text='B', command=lambda: self.add(30)).grid(row=0, column=1, sticky='nsew')
        tk.Button(text='clear', command=lambda: self.add(0)).grid(row=0, column=2, sticky='nsew')
        self.form = tk.Frame()
        self.form.grid_columnconfigure(0, weight=1)
        self.form.grid_columnconfigure(1, weight=1)
        self.form.grid(row=1, column=0, columnspan=3, sticky='nsew')
        self.mainloop()

    def add(self, n):
        # self.form.grid_remove()
        # self.update()
        for child in self.form.winfo_children():
            child.destroy()

        for i in range(0, 2 * n, 2):
            name = f'Row {i // 2 + 1}'
            tk.Label(master=self.form, text=name, bg='sky blue').grid(row=i, column=0, sticky='nsew')
            tk.Button(master=self.form, text=name, relief='flat', bg='white').grid(row=i, column=1, sticky='nsew')
            tk.Frame(master=self.form, height=1, bg='black').grid(row=i + 1, column=0, columnspan=2, sticky='nsew')
        # self.form.grid()


if __name__ == '__main__':
    app = App()

方法1：预创建组件再替换，消除空窗期 #

闪烁的核心原因是销毁旧组件后，新组件创建完成前Frame处于空白状态，导致界面刷新时出现闪烁。可以先在临时容器中创建好所有新组件，再一次性替换原Frame：

修改add方法如下：

def add(self, n):
    # 创建临时Frame存放新组件
    temp_form = tk.Frame()
    temp_form.grid_columnconfigure(0, weight=1)
    temp_form.grid_columnconfigure(1, weight=1)

    for i in range(0, 2 * n, 2):
        name = f'Row {i // 2 + 1}'
        tk.Label(master=temp_form, text=name, bg='sky blue').grid(row=i, column=0, sticky='nsew')
        tk.Button(master=temp_form, text=name, relief='flat', bg='white').grid(row=i, column=1, sticky='nsew')
        tk.Frame(master=temp_form, height=1, bg='black').grid(row=i + 1, column=0, columnspan=2, sticky='nsew')
    
    # 销毁原Frame并替换为临时Frame
    self.form.destroy()
    self.form = temp_form
    self.form.grid(row=1, column=0, columnspan=3, sticky='nsew')

方法2：启用双缓冲（Windows系统适用） #

Windows平台下，可通过设置窗口的双缓冲属性减少闪烁，在App初始化时添加：

self.attributes('-doublebuffer', True)

方法3：复用组件而非销毁重建 #

如果表单结构固定，仅内容变化，复用现有组件是最彻底的解决方式，避免频繁销毁重建带来的闪烁：

def __init__(self):
    super().__init__()
    self.geometry('400x900')
    self.resizable(width=0, height=0)
    self.grid_rowconfigure(1, weight=1)
    self.grid_columnconfigure(0, weight=1, uniform='a')
    self.grid_columnconfigure(1, weight=1, uniform='a')
    self.grid_columnconfigure(2, weight=1, uniform='a')
    tk.Button(text='A', command=lambda: self.add(20)).grid(row=0, column=0, sticky='nsew')
    tk.Button(text='B', command=lambda: self.add(30)).grid(row=0, column=1, sticky='nsew')
    tk.Button(text='clear', command=lambda: self.add(0)).grid(row=0, column=2, sticky='nsew')
    self.form = tk.Frame()
    self.form.grid_columnconfigure(0, weight=1)
    self.form.grid_columnconfigure(1, weight=1)
    self.form.grid(row=1, column=0, columnspan=3, sticky='nsew')
    self.rows = []  # 存储行组件的引用
    self.mainloop()

def add(self, n):
    # 移除多余的行组件
    while len(self.rows) > n:
        label, button, separator = self.rows.pop()
        label.destroy()
        button.destroy()
        separator.destroy()
    
    # 更新或创建行组件
    for i in range(n):
        name = f'Row {i + 1}'
        if i < len(self.rows):
            # 复用现有组件，更新内容
            label, button, _ = self.rows[i]
            label.config(text=name)
            button.config(text=name)
        else:
            # 创建新行组件
            label = tk.Label(master=self.form, text=name, bg='sky blue')
            button = tk.Button(master=self.form, text=name, relief='flat', bg='white')
            separator = tk.Frame(master=self.form, height=1, bg='black')
            
            label.grid(row=2*i, column=0, sticky='nsew')
            button.grid(row=2*i, column=1, sticky='nsew')
            separator.grid(row=2*i+1, column=0, columnspan=2, sticky='nsew')
            
            self.rows.append([label, button, separator])

内容的提问来源于stack exchange，提问作者BTjacker