Question

我想在kv文件中创建ScreenManager，但我还需要更改.py文件中显示的屏幕。那是因为我必须创建一些按钮
动态地将特定函数绑定到它们，这将更改为特定（按钮相关）屏幕。在python中创建按钮更方便。所以主要的问题是：如何通过py文件访问在kv文件中创建的screenmanager？为了进一步解释，这里有一些代码：

kv文件

#: kivy 1.10.1

ScreenManager:
    id: screen_manager

    FirstScreen:
        id: first_screen
        name: 'FirstScreen'
        manager: 'screen_manager'
    SecondScreen:
        id: second_screen
        name: 'SecondScreen'
        manager: 'screen_manager'

py文件

from kivy.modules import console
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.properties import ObjectProperty


class FirstScreen(Screen):
    MenuScreen = ObjectProperty(None)

    def SwitchToSecond(self):
        print(ScreenManagement.current)
        ScreenManagement.current = "TestScreen"


class SecondScreen(Screen):
    pass


class testApp(App):
    pass

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

提前感谢您的任何指导

Answer 1

这是一个使用ScreenManager的简单示例（我还在MyScreenManager类中添加了一个接受// normal, remote dependencies debugImplementation 'com.remote:dependency1:x.x.x' qaImplementation 'com.remote:dependency1:x.x.x' releaseImplementation 'com.remote:dependency1:x.x.x' debugImplementation 'com.remote:dependency2:x.x.x' qaImplementation 'com.remote:dependency2:x.x.x' releaseImplementation 'com.remote:dependency2:x.x.x' // debugLocal dependencies debugLocalImplementation project(':dependency1') debugLocalImplementation project(':dependency2')的方法，该方法对应于您想要更改的屏幕名称，但不是必需的这个应用程序运行）：

<强>的Python

value

<强> KV

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

class Screen1(Screen):

    pass

class Screen2(Screen):

    pass

class Screen3(Screen):

    pass

class MyScreenManager(ScreenManager):

    def changescreen(self, value):

        self.current = value

#Main application
class TestApp(App):

    def build(self):
        self.sm = MyScreenManager()
        return self.sm

if __name__ == '__main__':
    TestApp().run()

Answer 2

如果要访问屏幕中的ScreenManager，则必须使用其manager属性，但为此，您不能创建具有相同名称的属性，在您执行此操作的情况下，被认为是一种不好的做法。

修改代码并添加一些元素我们获得以下示例：

<强> *。KV

#: kivy 1.10.1

ScreenManager:
    id: screen_manager

    FirstScreen:
        id: first_screen
        name: 'FirstScreen'
        Button:
            text: "First"
            on_press: first_screen.SwitchToSecond()
    SecondScreen:
        id: second_screen
        name: 'SecondScreen'
        Label:
            text: "second"

即可。*吡啶

from kivy.modules import console from kivy.app import App from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition from kivy.properties import ObjectProperty class FirstScreen(Screen): MenuScreen = ObjectProperty(None) def SwitchToSecond(self): self.manager.current = "SecondScreen" class SecondScreen(Screen): pass class testApp(App): pass if __name__ == "__main__": testApp().run()

通过py文件访问在kv文件中创建的kivy screenmanager

2 个答案: