python - Tkinter 窗口不显示任何内容

Question

我有一个程序加载速度非常慢，并且没有迹象表明它正在加载，所以我试图弹出一个窗口，显示“正在加载...请稍候”并有一个进度条。我正在尝试使用线程，我有点理解，但我不太擅长使用它们。我的问题是，当我的窗口弹出时，除了默认的 tk 窗口之外，它不显示任何内容。我认为我的问题与我调用 root.mainloop 或 root.update 时有关。这是我的代码

from Tkinter import *
from PIL import Image, ImageTk
import Tkinter
import ttk
import subprocess
import threading
import time

class MainUI:

    def __init__(self,parent):
        self.parent = parent
        self.counter = IntVar()
        self.main_container = Frame(self.parent)
        self.main_container.pack()
        self.startThread

    def center():
        self.parent.update_idletasks()
        w = self.parent.winfo_screenwidth()
        h = self.parent.winfo_screenheight()
        size = tuple(int(_) for _ in self.parent.geometry().split('+')[0].split('x'))
        x = w/2 - size[0]/2
        y = h/2 - size[1]/2
        self.parent.geometry("%dx%d+%d+%d" % (size + (x, y)))
        self.parent.lift()


    def progress_bar():
        ft = ttk.Frame()
        ft.pack(expand=True, fill=Tkinter.BOTH, side=Tkinter.TOP)
        pb = ttk.Progressbar(ft, orient='horizontal', mode='determinate', variable = self.counter, maximum=100)
        pb.pack(expand=True, fill=Tkinter.BOTH, side=Tkinter.BOTTOM)
        pb.start(20)
        label = Tkinter.Label(self.parent, Text='Loading...Please Wait') # code before computation starts
        label.pack(expand=True, fill=Tkinter.BOTH, side=Tkinter.TOP)
        self.center
        self.parent.lift()
        self.parent.wm_title("")
        self.parent.update()

    def startThread(self):
        def btn_start_click():
            self.progress_bar()
            for i in range(101):
                self.counter.set(i)
                time.sleep(1)
                self.parent.update()
        t = threading.Thread(None, btn_start_click, ())
        t.start()
        self.parent.update()


def op():
    ##p1 = subprocess.Popen(['program to open'], stdout=None)
    print()

def Main():
    root = Tkinter.Tk()
    t1=threading.Thread(target=op)
    t1.start()
    MainUI(root)
    root.mainloop()
    t1.join()

if __name__ == '__main__':
    Main()

Answer 1

好吧，我解决了我的问题。我改变的第一件事就是搬家 将标签部分放入 main 中，我需要更改的第一件事是在 btn_start_click 之后添加 () 。其次，我需要在更新 self.counter 后更新 root。第三，完成后我需要毁掉我的 window 。我想这就是我改变的一切。如果我没有提及所有内容，这是我的工作代码。

from Tkinter import *
from PIL import Image, ImageTk
import Tkinter
import ttk
import subprocess
import threading
import time

class MainUI:
    def __init__(self,parent):
        self.parent = parent
        self.counter = IntVar()
        self.startThread()

    def center(self):
        self.parent.update_idletasks()
        w = self.parent.winfo_screenwidth()
        h = self.parent.winfo_screenheight()
        size = tuple(int(_) for _ in self.parent.geometry().split('+')[0].split('x'))
        x = w/2 - size[0]/2
        y = h/2 - size[1]/2
        self.parent.geometry("%dx%d+%d+%d" % (size + (x, y)))

    def progress_bar(self):
        ft = ttk.Frame()
        ft.pack(expand=True, fill=Tkinter.BOTH, side=Tkinter.TOP)



        pb = ttk.Progressbar(ft, orient='horizontal', mode='determinate', variable = self.counter, maximum=45)
        print(self.counter)
        pb.pack(expand=True, fill=Tkinter.BOTH, side=Tkinter.BOTTOM)

        self.center()
        self.parent.lift()
        self.parent.title("")


    def startThread(self):
        def btn_start_click():
            self.progress_bar()
            for i in range(46):
                self.counter.set(i)
                self.parent.update()
                print(i)
                time.sleep(1)

        t = threading.Thread(target = btn_start_click())
        t.start()
        self.parent.destroy()

def op():
    ##p1 = subprocess.Popen(['program to open'], stdout=None)
    print()

def Main():
    root = Tkinter.Tk()
    label = Tkinter.Label(root, Text = 'Loading...Please Wait') # code before computation starts
    label.pack(expand=True, fill=Tkinter.BOTH, side=Tkinter.TOP)

    t1=threading.Thread(target=op())
    t1.start()
    MainUI(root)
    t1.join()

if __name__ == '__main__':
    Main()