我有一個程式可以打開一個視窗，并在中心打開一個圓圈，在開始時填充綠色。每次按下按鈕（此代碼中的 r ）時，我希望這個圓圈從紅色變為綠色，從綠色變為紅色，但是我只能更改一次顏色
from tkinter import *
import keyboard
if __name__ == '__main__':
window = Tk()
window.title("On Record")
window.configure(width=500, height=300)
window.configure(bg='lightgray')
myCanvas = Canvas(window)
myCanvas.pack()
def daire(x, y, r, canvasName, color): # center coordinates, radius
x0 = x - r
y0 = y - r
x1 = x r
y1 = y r
return canvasName.create_oval(x0, y0, x1, y1, fill=color)
# move window center
winWidth = window.winfo_reqwidth()
winwHeight = window.winfo_reqheight()
posRight = int(window.winfo_screenwidth() / 2 - winWidth / 2)
posDown = int(window.winfo_screenheight() / 2 - winwHeight / 2)
window.geometry(" {} {}".format(posRight, posDown))
color = "green"
def onKeyPress(event):
print("pressed")
counter = 0
counter = counter 1
print(counter)
if counter % 2 == 0:
color = "green"
else:
color = "red"
daire(190, 135, 120, myCanvas, color)
window.bind("r", onKeyPress)
daire(190, 135, 120, myCanvas, "green")
window.mainloop()
uj5u.com熱心網友回復：
問題是事件函式依賴于計數器是奇數還是偶數，但每次運行時它都會自動將其重置為 0。對此的一種解決方案是將計數器放在函式之外并將其稱為全域。
from tkinter import *
import keyboard
if __name__ == '__main__':
window = Tk()
window.title("On Record")
window.configure(width=500, height=300)
window.configure(bg='lightgray')
myCanvas = Canvas(window)
myCanvas.pack()
def daire(x, y, r, canvasName, color): # center coordinates, radius
x0 = x - r
y0 = y - r
x1 = x r
y1 = y r
return canvasName.create_oval(x0, y0, x1, y1, fill=color)
# move window center
winWidth = window.winfo_reqwidth()
winwHeight = window.winfo_reqheight()
posRight = int(window.winfo_screenwidth() / 2 - winWidth / 2)
posDown = int(window.winfo_screenheight() / 2 - winwHeight / 2)
window.geometry(" {} {}".format(posRight, posDown))
color = "green"
counter = 0
def onKeyPress(event):
global counter
print("pressed")
counter = 1
print(counter)
if counter % 2 == 0:
color = "green"
else:
color = "red"
daire(190, 135, 120, myCanvas, color)
window.bind("r", onKeyPress)
daire(190, 135, 120, myCanvas, color)
window.mainloop()
出于興趣，您實際上是否需要能夠跟蹤按下 r 的次數？它由您的腳本暗示，但未明確說明。否則，通過直接參考 tkinter 元素，有更簡化的方法來執行此操作，正如本文中顯示的按鈕切換通常所做的那樣。
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