在 Kivy 中使用 Gif 徽标加载屏幕答案

【问题标题】：Use Gif Logo For Loading Screen In Kivy在 Kivy 中使用 Gif 徽标加载屏幕
【发布时间】：2021-04-19 08:25:39
【问题描述】：

我们可以使用 gif 标志 加载屏幕 30 秒然后切换到其他屏幕吗？如果是，如何？

喜欢这个 gif：

【问题讨论】：

标签： python python-3.x kivy kivy-language kivymd

【解决方案1】：

您可以通过以下代码获得所需的输出

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.clock import Clock

from kivy.uix.screenmanager import ScreenManager, Screen, WipeTransition, FadeTransition, NoTransition
from kivy.uix.floatlayout import FloatLayout


Builder.load_string("""

<FirstScreen>:
    orientation: "vertical"
    Image:
        id: gif
        source: 'load.gif'
        pos: self.pos
        size_hint: None, None
        size: root.size
        allow_stretch: True
        keep_ratio: False
        anim_delay: -1
        anim_loop: 1
        
<SecondScreen>:
    orientation: "vertical"
    Label:
        text:"Second Screen"
        
""")


class FirstScreen(Screen, FloatLayout):
    secs = 0

    def __init__(self, **kwargs):
        super(FirstScreen, self).__init__(**kwargs)
        self.orientation = "vertical"
        Clock.schedule_interval(self.update_time, 1)

    def update_time(self, sec):
        self.secs = self.secs+1
        '''  30 seconds'''
        if self.secs == 30:
            self.manager.current = 'second'

    def on_enter(self):
        self.ids.gif.anim_delay = 0.10



class SecondScreen(Screen, FloatLayout):

    def __init__(self, **kwargs):
        super(SecondScreen, self).__init__(**kwargs)
        self.orientation = "vertical"


class ExampleApp(App):

    def build(self):
        sm = ScreenManager(transition=NoTransition())
        sm.add_widget(FirstScreen(name='first'))
        sm.add_widget(SecondScreen(name='second'))
        return sm


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

使用anim_delay来延迟动画

参考检查如下：

https://kivy.org/doc/stable/api-kivy.clock.html

https://kivy.org/doc/stable/api-kivy.uix.screenmanager.html

https://kivy.org/doc/stable/api-kivy.uix.image.html

【讨论】：