删除 Tkinter 画布文本项的内容 [英] Deleting contents of a Tkinter canvas text item

问题描述

如下所示，函数 1 调用另一个函数 (draw_text)，以便我可以将我的输出/结果显示到画布内的标签中，并在我的 GUI 中.这一切都很好(感谢 Stack Overflow ！！)

As shown below, Function 1 calls another function (draw_text) so that I can display my output / result to a label within the canvas out my GUI. This all work great (thanks to Stack Overflow!!)

# Function 1

def Relay_1():
    arduinoData.write(b'1')
    draw_text(self, 'This is a Test')

# Function 2

def Relay_():
    arduinoData.write(b'1')
    draw_text(self, 'This is another test number 2')

#Function 3

def draw_text(self, text):
    self.canvas.create_text(340,330, anchor='center', text=text,
                            font=('Arial', '10', 'bold'))

现在我的问题:

如何清除标签内容"?每次调用函数 1 或函数 2 时，画布上的结果都会刷新/更新.目前，短信只会覆盖自己.

How do I clear the "contents of the label" that has been created so each time I call Function 1 or 2, the result on the canvas will refresh / update. Currently the text message just overwrites itself.

推荐答案

每次在画布上创建对象时，它都会返回一个标识符.您可以将此标识符传递给画布 delete 方法.

Each time you create an object on a canvas, it returns an identifier. You can pass this identifier to the canvas delete method.

label_id = self.canvas.create_text(...)
...
self.canvas.delete(label_id)

您还可以为一个项目提供一个或多个标签，并使用标签而不是 id:

You can also supply one or more tags to an item, and use the tag rather than the id:

self.canvas.create_text(..., tags=('label',))
...
self.canvas.delete('label')

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