带有渐变效果的Kivy Splash屏幕图像 [英] Kivy Splash Screen image with fade in effect

问题描述

我想知道如何用猕猴桃制作一个初始屏幕，并在淡入淡出的状态下显示图片几秒钟.

I would like to know how to make a splash screen with kivy and display a picture in fade in for few seconds.

我能做的最好的就是这段代码:

The best i can do was with this code:

class MyApp(App):

    def __init__(self, **kwargs):
        super(MyApp, self).__init__(**kwargs)
        self.splash_screen_image = Image(source='images/pyrat_icon.png', size=(0, 0))
        Clock.schedule_once(self.start_anim, .01)

    def build(self):
        self.main_widget = MainWidget()
        return self.main_widget

    def start_anim(self, dt):
        self.splash_screen_image.pos = (self.main_widget.center_x, self.main_widget.center_y)
        self.main_widget.add_widget(self.splash_screen_image)
        animation = Animation(x=self.main_widget.center_x - 35, y=self.main_widget.center_y - 35, height=70, width=70, d=2,
                              t='in_quad')
        animation.start(self.splash_screen_image)
        Clock.schedule_once(self.end_anim, 3)

    def end_anim(self, dt):
        self.main_widget.remove_widget(self.splash_screen_image)

这会在屏幕上显示我的徽标，并在3秒钟后消失，但它会等待应用启动，因此在加载应用时只有一个黑色窗口.

This display my logo on the screen and it disappear after 3 seconds but it wait for the app to start so when the app is loading there is only a black window.

推荐答案

Android/iOS:

默认情况下，在python-for-android(

Splashscreen is used by default on python-for-android (presplash), there you can set whatever image you like. Don't know how does it work on ios, but I think there is splashscreen too.

Windows/Linux/Mac/RPi:

在这些东西上不存在这样的东西.在为OS打包时，也许可以使用 PyInstaller 进行设置，否则，您需要自己进行设置.我可以建议您使用 ScreenManager 及其Transitions与 Clock 甚至示例

No such thing exists on these. Maybe you can set something with PyInstaller when packaging for the OS, otherwise you'd need to make it yourself. I can recommend you using ScreenManager and its Transitions combined with Clock or maybe even Animation - depends on what wou want that image to do. Example

要设置过渡的长度，请在此处，在转换过程中应该可以访问它，例如FadeTransition(duration=1.5)

To set a length of a transition look here, which should be accessible within transitions e.g. FadeTransition(duration=1.5)

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