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我有一系列图像，我试图使用 matplotlib 中的图形/绘图来显示它们。此外，我希望允许用户通过单击我使用创建的按钮next在图像之间导航。这是我的代码：previousmatplotlib.widgets

class Index(object):
   ind = 0

   def next(self, event):
      self.ind += 1
      orig_frame = cv2.imread(FFMPEG_PATH + all_frames[self.ind])
      ax.imshow(orig_frame)                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
      fig.canvas.draw()
      plt.waitforbuttonpress()


   def prev(self, event):
      self.ind -= 1
      if self.ind >= 0:
         orig_frame = cv2.imread(FFMPEG_PATH + all_frames[self.ind])
         ax.imshow(orig_frame)                                                                                                                                                                                                                                                                                                                                                                                   
         fig.canvas.draw()
         plt.waitforbuttonpress()

fig, ax = plt.subplots()
callback = Index()                                                                                                                                                                                               
start_frame = 0
orig_frame = cv2.imread(FFMPEG_PATH + all_frames[start_frame])
ax.imshow(orig_frame)

axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
axprev = plt.axes([0.7, 0.05, 0.1, 0.075])
next_button = Button(axnext, 'Next')
next_button.on_clicked(callback.next)
prev_button = Button(axprev, 'Previous')
prev_button.on_clicked(callback.prev)


plt.show()
plt.waitforbuttonpress()

问题是，虽然我已经把fig.canvas.draw()and放在了and函数plt.waitforbuttonpress()的末尾，但只要我点击按钮，程序就会终止。知道有什么问题吗？nextprevnext

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