如何使用tkinter自动执行按钮的动作？

如何解决如何使用tkinter自动执行按钮的动作？

我想实现的是，当我单击“自动分页”按钮时，PDF中的每一页都会显示1秒。现在，当我单击它时，它会在页面列表中循环，跳到最后一页，并且不显示任何其他页面。

在auto_read函数中，我放置了print（pagenumber）以查看其在页面中的循环时间。

from PIL import ImageTk,Image
from pdf2image import convert_from_path
import time

class SuReader:
    def __init__(self,root):
        self.root = root
        self.next_but = Button(root,text='>>',command=lambda: self.next_page())
        self.prev_but = Button(root,text='<<',command=self.prev_page)
        self.automate_but = Button(root,text='Autopaging',command=self.auto_read)
        self.next_but.grid(row=1,column=2)
        self.prev_but.grid(row=1,column=0)
        self.automate_but.grid(row=1,column=1)
        self.display_pages()


    def get_pages(self):
        self.pages = convert_from_path('book.pdf',size=(700,600))
        self.photos = []
        for i in range(len(self.pages)):
            self.photos.append(ImageTk.PhotoImage(self.pages[i]))


    def display_pages(self):
        self.get_pages()
        self.page_number = 0
        self.content = Label(self.root,image=self.photos[self.page_number])
        self.content.grid(column=0,row=0,sticky='NSEW',columnspan=3)
        print(len(self.photos))


    def next_page(self):
        # self.page_number += 1
        self.content.destroy()
        self.content = Label(self.root,columnspan=3)
        self.page_number += 1



    def prev_page(self):
        self.page_number -= 1
        print(self.page_number)
        self.content.destroy()
        self.content = Label(self.root,columnspan=3)


    def auto_read(self):
        for i in range(len(self.photos)):
            time.sleep(1)
            print(self.page_number)
            self.next_page()


root = Tk()
root.title('Book Reader')
program = SuReader(root)
root.mainloop()

在这里，我只是将其传递给next_page函数，但是即使我定义正确，它也不起作用。

解决方法

time.sleep正在阻止mainloop，我相信您也遇到了垃圾回收问题。我重写了您的代码并解决了您的问题。我也解决了您将要遇到的其他问题。更改将在脚本中注释。

import tkinter as tk
from PIL import ImageTk,Image
from pdf2image import convert_from_path

class App(tk.Tk):
    WIDTH  = 700
    HEIGHT = 640
    TITLE  = 'Book Reader'
    
    def __init__(self,**kwargs):
        tk.Tk.__init__(self,**kwargs)
        
        #get_pages and display_pages are useless just do it all in the constructor
        self.pages  = convert_from_path('book.pdf',size=(700,600))
        self.photos = {}
        for i in range(len(self.pages)):
            #the image might get garbage collected if you don't do it this way
            self.photos[f'photo_{i}'] = ImageTk.PhotoImage(self.pages[i])
            
        self.auto     = tk.IntVar()
        self.was_auto = False
        
        self.page_number = 0
        self.content     = tk.Label(self,image=self.photos[f'photo_{self.page_number}'])
        self.content.grid(column=0,row=0,sticky='nsew',columnspan=3)
        
        tk.Button(self,text='<<',command=self.prev_page).grid(row=1,column=0,sticky='w')
        tk.Checkbutton(self,text='auto-paging',variable=self.auto,command=self.auto_page).grid(row=1,column=1)
        tk.Button(self,text='>>',command=self.next_page).grid(row=1,column=2,sticky='e')
        
        self.grid_columnconfigure(0,weight=1)
        self.grid_rowconfigure(0,weight=1)
        self.grid_columnconfigure(2,weight=1)
        
    def next_page(self):
        #stop a lingering `after` call from affecting anything if we unchecked auto-paging
        if self.auto.get() == 0 and self.was_auto:
            self.was_auto = False
            return
            
        self.page_number += 1
        #never be out of range
        self.page_number = self.page_number % len(self.pages)
        #you don't have to remake the Label every time,just reassign it's image property
        self.content['image'] = self.photos[f'photo_{self.page_number}']
        
        #time.sleep(1) replacement ~ non-blocking 
        if self.auto.get() == 1:
            self.after(1000,self.next_page)

    def prev_page(self):
        self.page_number -= 1
        #never be out of range
        if self.page_number < 0:
            self.page_number += len(self.pages)
        self.content['image'] = self.photos[f'photo_{self.page_number}']
        
    def auto_page(self):
        if self.auto.get() == 1:
           #allows us to catch a lingering `after` call if auto-paging is unchecked
           self.was_auto = True
           self.next_page()
            

if __name__ == '__main__':
    app = App()
    app.title(App.TITLE)
    app.geometry(f'{App.WIDTH}x{App.HEIGHT}')
    app.resizable(width=False,height=False)
    app.mainloop()