python - 运行函数时显示 ttk 进度条(python)

Question

我的代码遇到问题。我尝试做的是在函数 ToDo() 运行时显示 ttk 不确定的进度条。我一直在互联网上搜索，发现了一些帖子，但在这些帖子中，人们从 tk 按钮启动其功能，而我的目标是从 tk 窗口外部启动它。这是我的尝试，它运行我的函数 ToDo() 但不显示进度条。我需要使用线程吗？如果是这样，我应该如何使用它？我是 python 新手...

try:
    import tkinter as tk
    from tkinter import ttk
except ImportError:
    import Tkinter as tk
    import ttk
import time

def ToDo():
    time.sleep(1)
    print("1 sec")
    time.sleep(1)
    print("2 sec")
    time.sleep(1)
    print("3 sec")
    time.sleep(1)
    print("4 sec")
    time.sleep(1)
    print("5 sec")
    global variable_check_final
    variable_check_final = True


class Application(tk.Frame):
    def __init__(self, main_window):
        # super().__init__(main_window)
        tk.Frame.__init__(self)
        main_window.title("Please wait")

        self.progressbar = ttk.Progressbar(self, mode="indeterminate")
        self.progressbar.pack()
        self.progressbar.place(x=30, y=60, width=200)
        self.place(width=200, height=200)
        main_window.geometry("300x200")
        self.progressbar.start()
        self.checkfinal()
        ToDo()


    def checkfinal(self):
        if variable_check_final == True:
            self.progressbar.stop()
            main_window.destroy()
        else:
            print("not yet")
            self.after(1000, self.checkfinal)



if __name__ == "__main__":
    print("started")
    global variable_check_final
    variable_check_final = False
    main_window = tk.Tk()
    app = Application(main_window)
    app.mainloop()

Answer 1

sleep 将在您需要的时间内停止整个程序，并且不允许您更新进度条。因此，创建一个包含 while 循环的函数，该循环将运行您所需的时间并更新窗口:

def Sleep(t, func):
    t1 = time.time()
    while time.time()-t1 < t:
        func()

t 是时间，func 是您将作为输入提供的函数，它将运行。要更新，您可以使用:

Sleep(1, main_window.update)

这是一个完整的工作代码:

try:
    import tkinter as tk
    from tkinter import ttk
except ImportError:
    import Tkinter as tk
    import ttk
import time

def Sleep(t, func):
    t1 = time.time()
    while time.time()-t1 < t:
        func()
def ToDo():
    Sleep(1, main_window.update)
    print("1 sec")
    Sleep(1, main_window.update)
    print("2 sec")
    Sleep(1, main_window.update)
    print("3 sec")
    Sleep(1, main_window.update)
    print("4 sec")
    Sleep(1, main_window.update)
    print("5 sec")
    global variable_check_final
    variable_check_final = True


class Application(tk.Frame):
    def __init__(self, main_window):
        # super().__init__(main_window)
        tk.Frame.__init__(self)
        main_window.title("Please wait")
        self.progressbar = ttk.Progressbar(self, mode="indeterminate")
        self.progressbar.place(x=30, y=60, width=200)
        self.place(width=200, height=200)
        main_window.update()
        main_window.geometry("300x200")
        self.progressbar.start()
        self.checkfinal()
        ToDo()


    def checkfinal(self):
        if variable_check_final == True:
            self.progressbar.stop()
            main_window.destroy()
        else:
            print("not yet")
            self.after(1000, self.checkfinal)



if __name__ == "__main__":
    print("started")
    global variable_check_final
    variable_check_final = False
    main_window = tk.Tk()
    app = Application(main_window)
    app.mainloop()