Question

有没有办法使用Tkinter在Python 3.4.1中逐字母打印（在帧更新之间重绘）？

使用这段代码在普通的IDLE窗口中可以这样做：

import time
string = "hello world"
for char in string:
    print(char, end='')
    time.sleep(.25)

但我不能在GUI Tkinter窗口中这样做。在我看来，我可以在tkinter窗口上显示一个标签，在字符串中添加一个字母，然后在添加另一个字母（大约0.25秒）之前等待一段时间，其思路与上面的代码相同。任何解决方案？

例如：

要显示的字符串 ='abc'

第一个框架：'a'

第二个框架：'ab'

第三个框架：'abc'

提前致谢！

Answer 1

你没有详细说明，所以我猜你会喜欢这样的东西：

import time
import tkinter as tk


def printString(string):
    for char in string:
        Label.configure(text=Label.cget('text') + char)
        Label.update()
        time.sleep(.25)

root = tk.Tk()
text = "Hello world!"
Label = tk.Label(root)
Label.pack()
printString(text)
root.mainloop()

更新：

相同的原则，但canvas：

import time
import tkinter as tk


def printString(item, string):
    if item:
        for char in string:
            idx = c.index(item, tk.END)
            c.insert(item, idx, char)
            c.update()
            time.sleep(.25)


root = tk.Tk()
text = "Hello world!"
c = tk.Canvas(root)
c_txt = c.create_text(50,50)
c.pack()
c.update()
printString(c_txt, text)

root.mainloop()

Answer 2

您可以使用after定期调用方法来更新GUI。 label 不易于使用，因为它阻止了GUI运行的主线程。

您可以定期替换 try: import tkinter as tk except: import Tkinter as tk def update_label_letter(): global label label['text'] = label.string[label.current_char_index] label.current_char_index += 1 label.current_char_index %= len(label.string) label.after(250, update_label_letter) if __name__ == '__main__': root = tk.Tk() label = tk.Label(root) label.string = "Hello World!" label.current_char_index = 0 root.after(250, update_label_letter) label.pack() root.mainloop()的单个字符文字 字母串中的字母 ：

label

一种方法是定期追加单 try: import tkinter as tk except: import Tkinter as tk def update_label_letters(): global label _no_of_space_replacements = label['text'].count('\n') _last_char_index = len(label['text']) - _no_of_space_replacements if _last_char_index < len(label.string): label['text'] += label.string[_last_char_index].replace(" ", " \n") else: label['text'] = "" label.after(250, update_label_letters) if __name__ == '__main__': root = tk.Tk() label = tk.Label(root, wraplength=1) label.string = "Hello World!" root.after(250, update_label_letters) label.pack() root.mainloop()的字母。

<强>垂直

try:
    import tkinter as tk
except:
    import Tkinter as tk


def update_label_letters():
    global label
    _last_char_index = len(label['text'])
    if _last_char_index < len(label.string):
        label['text'] += label.string[_last_char_index]
    else:
        label['text'] = ""
    label.after(250, update_label_letters)


if __name__ == '__main__':
    root = tk.Tk()
    label = tk.Label(root)
    label.string = "Hello World!"
    root.after(250, update_label_letters)
    label.pack()
    root.mainloop()

<强>水平

letter_labels

另一种方法是 定期将字母 写为空，但显示为try: import tkinter as tk except: import Tkinter as tk def update_label_letters(): global current_char_index, my_string, letter_labels if current_char_index < len(my_string): _current_char = my_string[current_char_index] letter_labels[current_char_index]['text'] = _current_char letter_labels[current_char_index].after(250, update_label_letters) current_char_index += 1 if __name__ == '__main__': root = tk.Tk() my_string = "Hello World!" letter_labels = list() for index, value in enumerate(my_string): letter_labels.append(tk.Label(root)) letter_labels[index].pack() current_char_index = 0 root.after(250, update_label_letters) root.mainloop()。

<强>垂直

try:
    import tkinter as tk
except:
    import Tkinter as tk


def update_label_letters():
    global current_char_index, my_string, letter_labels
    if current_char_index < len(my_string):
        _current_char = my_string[current_char_index]
        letter_labels[current_char_index]['text'] = _current_char
        letter_labels[current_char_index].after(250, update_label_letters)
        current_char_index += 1


if __name__ == '__main__':
    root = tk.Tk()

    my_string = "Hello World!"
    letter_labels = list()
    for index, value in enumerate(my_string):
        letter_labels.append(tk.Label(root))
        letter_labels[index].pack(side='left')
    current_char_index = 0
    root.after(250, update_label_letters)
    root.mainloop()

<强>水平

letter_labels

另一种方法是定期显示 try: import tkinter as tk except: import Tkinter as tk def show_label(): global current_char_index, my_string, letter_labels if current_char_index < len(my_string): letter_labels[current_char_index].pack() letter_labels[current_char_index].after(250, show_label) current_char_index += 1 if __name__ == '__main__': root = tk.Tk() my_string = "Hello World!" letter_labels = list() for _char in my_string: letter_labels.append(tk.Label(root, text=_char)) current_char_index = 0 root.after(250, show_label) root.mainloop()。

<强>垂直

try:
    import tkinter as tk
except:
    import Tkinter as tk


def show_label():
    global current_char_index, my_string, letter_labels
    if current_char_index < len(my_string):
        letter_labels[current_char_index].pack(side='left')
        letter_labels[current_char_index].after(250, show_label)
        current_char_index += 1


if __name__ == '__main__':
    root = tk.Tk()

    my_string = "Hello World!"
    letter_labels = list()
    for _char in my_string:
        letter_labels.append(tk.Label(root, text=_char))
    current_char_index = 0
    root.after(250, show_label)
    root.mainloop()

<强>水平

ReactDOM.render

使用Tkinter逐字打印

2 个答案: