Question

我是新手，所以我真的不知道如何在NaviWindow中显示进度条。我似乎无法将进度条放在kv文件中，所以谁知道如何在NaviWindow中显示进度条？

.pyfile

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.progressbar import ProgressBar
from kivy.uix.screenmanager import ScreenManager, Screen

KV = """

WindowManager:
    NaviWindow:

<NaviWindow>:


"""

class WindowManager(ScreenManager):
    pass

class NaviWindow(Screen):
    def build(self):
        Progress = ProgressBar(max=1000)
        Progress.value = 100
        return Progress


class MyMainApp(App):
    def build(self):
        return Builder.load_string(KV)

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

Answer 1

只有App类（显然是从App继承的类）具有build方法，但是您似乎认为Screen方法也具有build方法，并且显然是错误的。解决方案是使用add_widget()方法添加ProgressBar：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.progressbar import ProgressBar
from kivy.uix.screenmanager import ScreenManager, Screen

KV = """
WindowManager:
    NaviWindow:

<NaviWindow>:
"""


class WindowManager(ScreenManager):
    pass


class NaviWindow(Screen):
    def __init__(self, **kwargs):
        super(NaviWindow, self).__init__(**kwargs)
        self.progress = ProgressBar(max=1000)
        self.progress.value = 100
        self.add_widget(self.progress)


class MyMainApp(App):
    def build(self):
        return Builder.load_string(KV)


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

无法在窗口中显示进度栏

1 个答案: