Question

我正在尝试使用kivy在屏幕上打印一些字词。我正在寻找的是打印第一个单词然后睡2秒然后清除第一个单词并打印第二个单词

我目前正在做的事情：

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout

from random import choice
from time import sleep

xWords = ["hello1", "hello2", "hello3", "hello4", "hello5"]

class Test(GridLayout):
    def __init__(self, **kwargs):
        super(Test, self).__init__(**kwargs)
        self.cols = 1
        for x in xrange(2):
            # I want it to show frist word then sleep 2 sec then clear first word from screen then print second word
            self.add_widget(Label(text = "[b]"+choice(xWords)+"[/b]", markup = True, font_size = "40sp"))
            sleep(2)
        # then clear all words in screen
        for x in xrange(5):
            # then show the new 4 words
            self.add_widget(Label(text = "[b]"+choice(xWords)+"[/b]", markup = True, font_size = "40sp"))

class TestApp(App):
    def build(self):
        return Test()

if __name__ == "__main__":
    TestApp().run()

我该怎么做？

Answer 1

不要使用time.sleep，这会阻止gui，因为整个函数在time.sleep之前都不会返回。

请改用Clock.schedule_once。下面是一个在2秒内调用一个名为update的函数的简单示例，您可以在该函数中执行任何操作，包括调度另一个函数。

from kivy.clock import Clock
class Test(GridLayout):
    def __init__(self, **kwargs):
        super(Test, self).__init__(**kwargs)
        Clock.schedule_once(self.update, 2)  # 2 is for 2 seconds
    def update(self, *args):
        self.clear_widgets()
        # then add some more widgets here

使用Kivy在屏幕上打印并清除输出

1 个答案: