我想在单击按钮后实现到新屏幕的过渡,并且我想通过该功能来实现。 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:
和此文件
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()
,但是当我运行并按“文档按钮”时,出现此错误
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,或者我不能理解的地方吗?
更多细节,以便错误通知消失。 还有更多细节,以便错误通知消失。 还有更多细节,以便错误通知消失。
答案 0 :(得分:1)
发生问题是因为ScreenFrame
是BoxLayout
(根据您的kv文件),而不是Screen
。因此,您调用的root
(在这种情况下为ScreenFrame
)没有与之关联的manager
。 manager
与Screen
本身相关。
您必须引用ScreenFrame
小部件的父小部件才能引用当前的Screen
,并且它与manager
相关联。为了清楚起见,我建议按照以下方式重组您的Python代码和kv文件:
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')
答案 1 :(得分:0)
有两个AttributeError,它们如下:
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'
在kv文件中,定义了dynamic class,<ScreenFrame@BoxLayout>:
,但尚未实现go_to_dcs()
方法。
on_press: root.manager.current = 'nts' File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__ AttributeError: 'ScreenFrame' object has no attribute 'manager'
动态类<ScreenFrame@BoxLayout>:
具有 BoxLayout 继承,但没有 Screen 继承。因此,它没有名为 manager 的属性。
<ScreenFrame@BoxLayout>:
替换动态类<ScreenFrame>:
<ScreenFrame>:
-将root.manager.current
替换为app.root.current
<ScreenFrame>:
Button:
text: "Notes"
on_press: app.root.current = 'nts'
Button:
text: "Docs"
on_release: root.go_to_dcs()
Button:
text: "Videos"
on_press: app.root.current = 'vds'
Button:
text: "Pictures"
on_press: app.root.current = 'pctrs'
Kv语言共有三个关键字:
app :始终引用您的应用程序实例。
root :是指当前规则中的基本小部件/模板
自身 :始终引用当前小部件
from kivy.uix.boxlayout import BoxLayout
class ScreenFrame():
替换为class ScreenFrame(BoxLayout):
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
Builder.load_file("main.kv")
class ScreenFrame(BoxLayout):
def go_to_dcs(self):
print("\nScreenFrame.go_to_dcs")
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()
#:kivy 1.11.0
<ScreenFrame>:
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"
on_press: app.root.current = 'nts'
Button:
text: "Docs"
on_release: root.go_to_dcs()
Button:
text: "Videos"
on_press: app.root.current = 'vds'
Button:
text: "Pictures"
on_press: app.root.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"
<DcsScreen>:
ScreenFrame:
<VdsScreen>:
ScreenFrame:
<PctrsScreen>:
ScreenFrame: