Question

总体问题是：为什么我的Kivy应用程序立即崩溃？

我的 Python 代码是：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.widget import Widget
from kivy.graphics import Line

class MainScreen(Screen):
    pass

class AnotherScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass

class TouchInput(Widget):
    def on_touch_down(self, touch):
        with self.canvas:
            touch.ud["line"] = Line(points=(touch.x, touch.y))
    def on_touch_move(self, touch):
        touch.ud["line"].points += (touch.x, touch.y)

presentation = Builder.load_file("simplekivy.kv")

class SimpleKivy(App):
    def build(self):
        return presentation

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

我的 Kv。代码是：

#: import FadeTransition kivy.uix.screenmanager.FadeTransition

ScreenManagement:
    transition: FadeTransition()
    MainScreen:
    AnotherScreen:

<MainScreen>:
    name: "Main"
    Button:
        on_release: app.root.current = "Other"
        text: "Next screen!"
        font_size: 50

<AnotherScreen>:
    name: "Other"
    FloatLayout:
        TouchInput:
            id: touch
        Button:
            on_release: app.root.current = "Main"
            text: "Going back!"
            font_size: 40
            color: 0,1,0,1
            size_hint: 0.3, 0.2
            pos_hint: {'right': 1, 'top': 1}

        Button:
            on_release: touch.canvas.clear()
            text: "Clear window"
            font_size: 40
            color: 0,1,0,1
            size_hint: 0.3, 0.2
            pos_hint: {'right': 1, 'top': 0}

当我删除“清除窗口”按钮时，该应用程序将按预期工作。但是，添加按钮后，它立即崩溃并显示错误消息：

Python已停止工作

Answer 1

当您使用python编写代码并使用kv时，库本身将在与.py文件相同的目录中查找.kv文件，因此您不必以'presentation = Builder.load_file（“ simplekivy。kv“）'

这可以解决，将python代码更改为：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.widget import Widget
from kivy.graphics import Line

class MainScreen(Screen):
    pass

class AnotherScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass

class TouchInput(Widget):
    def on_touch_down(self, touch):
        with self.canvas:
            touch.ud["line"] = Line(points=(touch.x, touch.y))
    def on_touch_move(self, touch):
        touch.ud["line"].points += (touch.x, touch.y)
#don't need this
#presentation = Builder.load_file("simplekivy.kv")

class SimpleKivy(App):
    pass
    #I commented on that part of your code and added a 'pass' above
    #def build(self):
    #    return presentation

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

Python / Kivy立即崩溃

1 个答案: