从不同的屏幕获取值(kivy)
从不同的屏幕获取值(kivy)
提问于 2018-06-05 03:48:03
我正在尝试实现以下目标:在screen FolderB中从Label: id: fb捕获文本，然后在screen FolderA中通过按“从文件夹B获取文本”按钮将文本复制/添加到Label: id: fa中。请找到下面的代码:提前谢谢，
文件main.py
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
Builder.load_file('foldera.kv')
Builder.load_file('folderb.kv')
class MainScreen(ScreenManager):
pass
class FolderA(Screen):
pass
class FolderB(Screen):
pass
class FTest(App):
def build(self):
return MainScreen()
if __name__ == '__main__':
FTest().run()文件ftest.kv (类构建)
<FolderA@FolderA>
<FolderB@FolderB>
<MainScreen>:
FolderA:
name: 'foldera'
FolderB:
name: 'folderb'文件布局( foldera.kv )
<FolderA>:
BoxLayout:
orientation: 'vertical'
Label:
text: 'Folder A'
Button:
text: 'go to Folder B'
on_press: app.root.current = 'folderb'
Label:
id: fa
text: ''
Button:
text: 'get text from Folder B'
on_press: "this is the button where i'm trying to apply the action"文件布局( folderb.kv )
<FolderB>:
BoxLayout:
orientation: 'vertical'
Label:
text: 'Folder B'
Button:
text: 'go to Folder B'
on_press: app.root.current = 'foldera'
Label:
id: fb
text: 'TEXT: CAPTURE THIS TEXT'屏幕截图
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-05 06:19:13
例如，您可以将共享变量保存在App类中。
然后，您可以通过编写app.label_a在kv中访问它
试一下这个例子：
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.properties import StringProperty
Builder.load_string("""
<Manager>:
Screen:
name: 'first'
BoxLayout:
Label:
text: app.label_a
Button:
text:'go to other'
on_press: app.sm.current = 'other'
Screen:
name: 'other'
BoxLayout:
Label:
id: label_b
text: "Screen 2 label. Press button to change."
Button:
text:'Get label text from screen 1'
on_press: label_b.text = app.label_a
""")
class Manager(ScreenManager):
pass
class MyApp(App):
label_a = StringProperty("Screen 1 Label")
def build(self):
self.sm = Manager()
return self.sm
MyApp().run()页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50687793
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