[英]TypeError: Function takes 1 positional argument but 2 were given kivy python
[英]TypeError: method()takes in 1 positional argument but 2 were given (Python and Kivy)
我試圖在我的py文件中使用函數在一定秒數后更改屏幕,這些是2個屏幕和ScreenManager(盡管不是所有代碼,都將其縮短為重要的位):
class StartScreen(Screen):
pass
class Buttons(Screen):
def change_screen(self):
WindowManager.current = "start_screen"
class WindowManager(ScreenManager):
pass
kv = Builder.load_file("my.kv")
class MyApp(App):
def build(self):
return kv
if __name__ == '__main__':
Window.fullscreen = "auto"
MyApp().run()
這是整個kv文件:
#:import NoTransition kivy.uix.screenmanager.NoTransition
#:import Clock kivy.clock.Clock
WindowManager:
transition: NoTransition()
StartScreen:
Buttons:
<StartScreen>:
name: "start_screen"
Button:
background_normal: "maxresdefault.jpg"
background_down: "maxresdefault.jpg"
size_hint: 0.3, 0.3
pos_hint: {"x": .35, "y": .35}
text: "Play"
font_size: 250
on_release:
app.root.current = "btn_screen"
root.reset_score()
<Buttons>:
name: "btn_screen"
btn: btn
on_enter:
Clock.schedule_once(root.change_screen, 5)
Button:
background_normal: "pepe11.png"
background_down: "pepe11.png"
id: btn
size_hint: 0.2, 0.3
pos_hint: {"x": .4, "y": .35}
on_press:
root.respawn()
所以我的問題出在進入Buttons屏幕時嘗試調用Clock.schedule_once命令,我一直在獲取“ TypeError:change_screen()接受1個位置參數,但給出2個”。
謝謝大家。
您有2個錯誤:
Clock.schedule_once()
將時間間隔作為參數傳遞給回調,因此您必須傳遞一個附加參數。
WindowManager.current
無效,因為current
不是靜態屬性,因此您必須通過一個對象訪問它,在Screen情況下,您可以訪問通過manager
屬性管理它的ScreenManager
。
因此解決方案是:
# ...
class Buttons(Screen):
def change_screen(self, dt):
self.manager.current = "start_screen"
# ...
Clock使用dt
參數(增量時間)作為回調函數。
您必須像這樣更改功能:
def change_screen(self, dt):
WindowManager.current = "start_screen"
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