matplotlibd出窗口中发生错误（AttributeError：“ NoneType”对象没有属性“ set_canvas”）

matplotlibd出窗口中发生错误（AttributeError：“ NoneType”对象没有属性“ set_canvas”）

我做了一个最小的工作示例，说明了如何做到这一点。

它需要对您的代码进行更改，但我不知道您在代码中所拥有的内容，并且您也没有创建最少的工作示例。

它使用（without
）在

generate_all_figures

（在您的代码中将

plot_sheets

使用

s

）中创建三个数字，并保持在列表中。

plot_sheet``s

window

显示此列表中的第一个图形。

Buttons

删除带有图形的画布，并从列表中使用下一个/上一个图形创建新的画布。

我使用

grid()

而不是

pack()

因为这样可以轻松地将新画布放在同一位置。

import tkinter as tkimport matplotlib.pyplot as pltfrom matplotlib.backends.backend_tkagg import FigureCanvasTkAggclass MyClass():    def __init__(self):        self.sheets = [[1,2,3], [3,1,2], [1,5,1]]        self.W = 2        self.L = 5        self.all_figures = []    def plot_sheet(self, data):        """plot single figure"""        fig, ax = plt.subplots(1)        ax.set_xlim([0, self.W])         ax.set_ylim([0, self.L])        ax.plot(data)        return fig    def generate_all_figures(self):        """create all figures and keep them on list"""        for data in self.sheets: fig = self.plot_sheet(data) self.all_figures.append(fig)def show_figure(number):    global dataPlot    # remove old canvas    if dataPlot is not None: # at start there is no canvas to destroy        dataPlot.get_tk_widget().destroy()    # get figure from list    one_figure = my_class.all_figures[number]    # display canvas with figuere    dataPlot = FigureCanvasTkAgg(one_figure, master=window)    dataPlot.draw()    dataPlot.get_tk_widget().grid(row=0, column=0)def on_prev():    global selected_figure    # get number of previous figure    selected_figure -= 1    if selected_figure < 0:        selected_figure = len(my_class.all_figures)-1    show_figure(selected_figure)def on_next():    global selected_figure    # get number of next figure    selected_figure += 1    if selected_figure > len(my_class.all_figures)-1:        selected_figure = 0    show_figure(selected_figure)# --- main ---my_class = MyClass()my_class.generate_all_figures()window = tk.Tk()window.rowconfigure(0, minsize=500)    # minimal heightwindow.columnconfigure(0, minsize=700) # minimal width# display first figure    selected_figure = 0dataPlot = None # default value for `show_figure`show_figure(selected_figure)# add buttons to change figuresframe = tk.frame(window)frame.grid(row=1, column=0)b1 = tk.Button(frame, text="<<", command=on_prev)b1.grid(row=0, column=0)b2 = tk.Button(frame, text=">>", command=on_next)b2.grid(row=0, column=1)window.mainloop()

---

可能无需替换画布即可完成，但可以替换剧情中的数据（

fig.data

???，

ax.data

???我不记得了）