我正在开发一个简单的 Kivy GUI 应用程序。我想要做的是,我想从第二个屏幕(其中未创建)访问类“CL_Random”的一个对象“obj_random”。我只是不知道如何访问在一个屏幕中声明的不同屏幕。
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
#from kivy.uix.boxlayout import BoxLayout
#from kivy.uix.popup import Popup
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.properties import ObjectProperty
class CL_FirstWindow(Screen):
def change_screen(self):
obj_random = CL_Random()
self.parent.current = 'second_window'
class CL_SecondWindow(Screen):
scond_prop = ObjectProperty(None)
def change_screens(self):
self.parent.current = 'first_window'
class ScreenManagement(ScreenManager):
pass
class CL_Random:
def __init__(self):
self.x = 5
presentation = Builder.load_file("rough2.kv")
class app(App):
def build(self):
return presentation
obj_app = app()
obj_app.run()
粗糙2.kv
ScreenManagement:
CL_FirstWindow:
CL_SecondWindow:
<CL_FirstWindow>:
id: first_window_id
name: 'first_window'
FloatLayout:
Button:
text: 'Button1'
size_hint: 0.3, 0.12
pos_hint: {'x':0.1,'y':0.6}
on_release: root.change_screen()
<CL_SecondWindow>:
id: second_window_id
name: 'second_window'
FloatLayout:
Button:
text: 'Button2'
size_hint: 0.3, 0.12
pos_hint: {'x':0.1,'y':0.6}
on_release: root.change_screens()
Label:
id: second_label_id
text: 'SECOND SCREEN'
pos_hint: {'x': 0.20, 'y':0.8}
size_hint: 1, 0.1
font_size: 35
halign: 'left'
valign: 'middle'
text_size: self.size
谢谢
要访问在类中声明的变量,第一件事是该变量必须是类的属性,以便范围更大,但在您的情况下,变量是本地的,当它完成执行功能。
另一方面,该解决方案基于通过 访问另一个 Screen ScreenManager
,并让对象访问它的属性,我们使用 get_screen() 方法:
CL_SecondWindow --> ScreenManager --> CL_FirstWindow --> obj_random
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.properties import ObjectProperty
class CL_FirstWindow(Screen):
def change_screen(self):
self.obj_random = CL_Random()
self.manager.current = 'second_window'
class CL_SecondWindow(Screen):
scond_prop = ObjectProperty(None)
def change_screens(self):
first_screen = self.manager.get_screen('first_window')
print(first_screen.obj_random.x)
self.parent.current = 'first_window'
class ScreenManagement(ScreenManager):
pass
class CL_Random:
def __init__(self):
self.x = 5
presentation = Builder.load_file("rough2.kv")
class app(App):
def build(self):
return presentation
obj_app = app()
obj_app.run()
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