Kivy 不会显示图像或标签

Question

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.image import Image
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput

class MyApp(App):
  def build(self):
    self.window = GridLayout(cols=1)
    self.window.add_widget(Image(source="logo.png"))
    self.greeting = Label(text="Hello", font_size=18)
    self.window.add_widget(self.greeting)

MyApp().run()

终端识别出图像和标签已导入，但不会在窗口中显示它们。

我期待弹出一个窗口，显示我上传的图像和标签。

Answer 1

build() 方法需要返回根部件，在本例中为 self.window。

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

class MyApp(App):
    def build(self):
        self.window = GridLayout(cols=1)
        self.window.add_widget(Image(source="logo.png"))
        self.greeting = Label(text="Hello", font_size=18)
        self.window.add_widget(self.greeting)
        return self.window


MyApp().run()