KIVY：如何同时处理多项任务

Question

我想在执行其他操作时在 kivy 中显示加载动画。我怎样才能做到这一点？对不起，我没有示例代码，我只是不知道从哪里开始。

Answer 1

我遇到了同样的问题，你可以使用线程来解决这个问题。

我不确定您想要完成什么，但假设您想在单击按钮时加载一些内容。加载时你想显示一个弹出窗口说 "loading"。这是一个简单的示例程序，可以让您执行此操作。

main.py

import threading
import time

from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.label import Label


class ExampleApp(App):
    def show_popup(self):
        # Create and open a popup
        self.loading_pop = Popup(title='Please wait', 
                                 content=Label(text='Loading...'),
                                 size_hint=(.8, .5), auto_dismiss=False)
        self.loading_pop.open()

    def process_btn_click(self):
        self.show_popup() # Open the popup

        # Start a thread, this allows you to display the popup while
        #     running some long task
        my_thread = threading.Thread(target=self.some_long_task)
        my_thread.start()

    def some_long_task(self):
        current_time = time.time()
        while current_time + 3 > time.time():  # 3 seconds
            time.sleep(1)

        # When the task is done, let the popup display "Done!"
        self.loading_pop.content.text = 'Done!'
        # Also let the user click out of the popup now
        self.loading_pop.auto_dismiss = True


if __name__ == '__main__':
    ExampleApp().run()

example.kv

Screen:
    Button:
        text: 'Click me'
        pos_hint: {'center_x': .5, 'center_y': .5}
        size_hint: .3, .2
        on_release:
            app.process_btn_click()

希望这能回答您的问题！

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