如何在Kivy中通过函数实现向新屏幕的过渡？
如何在Kivy中通过函数实现向新屏幕的过渡？
提问于 2018-08-01 03:12:50
我想在单击按钮后实现到新屏幕的转换，并且我想通过函数来实现这一点。我有这个kv代码
<ScreenFrame@BoxLayout>:
orientation: 'vertical'
cols: 3
ActionBar:
ActionView:
pos_hint: {'top':1}
use_separator: True
ActionPrevious:
title: "Title"
with_previous: False
ActionButton:
text: "+"
Label:
text: "Content"
BoxLayout:
orientation: 'horizontal'
cols: 4
size_hint: 1, 0.15
Button:
text: "Notes"
#don't work
on_press: root.manager.current = 'nts'
Button:
text: "Docs"
#don't work
on_release: root.go_to_dcs()
Button:
text: "Videos"
#don't work
on_release: root.manager.current = "vds"
Button:
text: "Pictures"
# don't work
on_release: root.manager.current = 'pctrs'
<NtsScreen>:
BoxLayout:
orientation: "vertical"
cols: 2
ScreenFrame:
Button:
text: "f"
#work, but me need implementaion through function
on_press: root.manager.current = "vds"
<DocsScreen>:
ScreenFrame:
<VdsScreen>:
ScreenFrame:
<PctrsScreen>:
ScreenFrame:这个文件
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.properties import StringProperty
from kivy.uix.widget import Widget
Builder.load_file("main.kv")
class ScreenFrame():
def go_to_dcs(self):
sm.current = "dcs"
class NtsScreen(Screen):
pass
class DcsScreen(Screen):
def go_to_dcs(self):
sm.current = 'dcs'
class VdsScreen(Screen):
pass
class PctrsScreen(Screen):
pass
# Create the screen manager
sm = ScreenManager()
sm.add_widget(NtsScreen(name='nts'))
sm.add_widget(DcsScreen(name='dcs'))
sm.add_widget(VdsScreen(name='vds'))
sm.add_widget(PctrsScreen(name='pctrs'))
class MainApp(App):
def build(self):
return sm
if __name__ == "__main__":
MainApp().run()，但当我运行并按下Docs Button时，出现以下错误
Traceback (most recent call last):
File "main.py", line 45, in <module>
MainApp().run()
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/app.py", line 826, in run
runTouchApp()
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/base.py", line 502, in runTouchApp
EventLoop.window.mainloop()
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/core/window/window_pygame.py", line 403, in mainloop
self._mainloop()
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/core/window/window_pygame.py", line 289, in _mainloop
EventLoop.idle()
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/base.py", line 340, in idle
self.dispatch_input()
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/base.py", line 325, in dispatch_input
post_dispatch_input(*pop(0))
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/base.py", line 291, in post_dispatch_input
wid.dispatch('on_touch_up', me)
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/uix/behaviors/button.py", line 179, in on_touch_up
self.dispatch('on_release')
File "kivy/_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
File "kivy/_event.pyx", line 1098, in kivy._event.EventObservers._dispatch
File "/home/parvektor228/TAOKF/lib/python3.6/site-packages/kivy/lang/builder.py", line 64, in custom_callback
exec(__kvlang__.co_value, idmap)
File "/home/parvektor228/TAOKF/KivyApp/memfier/main.kv", line 32, in <module>
on_release: root.go_to_dcs()
File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'ScreenFrame' object has no attribute 'go_to_dcs'错误在哪里，或者我可以做一些我不理解的事情吗？
更多细节，以便错误通知消失。更多细节，以便错误通知消失。更多细节，以便错误通知消失。
回答 1
Stack Overflow用户
发布于 2018-08-01 04:25:02
发生您的问题是因为ScreenFrame是BoxLayout (根据您的kv文件)，而不是Screen。因此，您调用的root (在本例中为ScreenFrame)没有与其关联的manager。manager与Screen本身相关联。
您必须引用ScreenFrame小部件的父小部件，才能引用当前的Screen及其关联的manager。为了清楚起见，我建议将Python代码和kv文件重组如下：
Python代码：
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.widget import Widget
Builder.load_file("testthis.kv")
class ScreenFrame(BoxLayout):
def go_to_screen(self, val):
self.parent.manager.current = val
class NtsScreen(Screen):
pass
class DcsScreen(Screen):
pass
class VdsScreen(Screen):
pass
class PctrsScreen(Screen):
pass
class MyScreenManager(ScreenManager):
pass
class MainApp(App):
def build(self):
self.sm = MyScreenManager()
return self.sm
if __name__ == '__main__':
MainApp().run()kv文件：
<MyScreenManager>:
NtsScreen:
name: 'nts'
DcsScreen:
name: 'dcs'
VdsScreen:
name: 'vds'
PctrsScreen:
name: 'pctrs'
<NtsScreen>:
ScreenFrame:
<DocsScreen>:
ScreenFrame:
<VdsScreen>:
ScreenFrame:
<PctrsScreen>:
ScreenFrame:
<ScreenFrame>:
orientation: 'vertical'
rows: 3
ActionBar:
ActionView:
pos_hint: {'top':1}
use_separator: True
ActionPrevious:
title: "Title"
with_previous: False
ActionButton:
text: "+"
Label:
text: "Content"
BoxLayout:
orientation: 'horizontal'
cols: 4
size_hint: 1, 0.15
Button:
text: "Notes"
on_press: root.go_to_screen('nts')
Button:
text: "Docs"
on_release: root.go_to_screen('dcs')
Button:
text: "Videos"
on_release: root.go_to_screen('vds')
Button:
text: "Pictures"
on_release: root.go_to_screen('pctrs')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/51620484
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