从字节变量设置Kivy图像

from kivy.app import App
from kivy.uix.image import Image
from kivy.core.image import Image as CoreImage
from kivy.uix.boxlayout import BoxLayout

class MyBoxLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyBoxLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'
        self.padding = 10

def set_image(self, image_bytes):
    image = CoreImage(BytesIO(image_bytes), ext='png')
    self.clear_widgets()  # 清空布局中的所有组件
    self.add_widget(Image(texture=image.texture))

class MyApp(App):
    def build(self):
        layout = MyBoxLayout()
        return layout

def build(self):
    layout = MyBoxLayout()
    with open('image.png', 'rb') as f:
        image_bytes = f.read()
    layout.set_image(image_bytes)
    return layout