![](/img/trans.png)
[英]How to use button behavior with screenmanager without .kv file in kivy
[英]Kivy ScreenManager without .kv file
我正在尝试在没有 .kv 文件的情况下进行屏幕转换。 没有.kv可以这样做吗? 这是代码
class ScreenManagement(ScreenManager):
def __init__(self, **kwargs):
super(ScreenManagement, self).__init__(**kwargs)
class testW(Screen):
def __init__(self, **kwargs):
super(testW, self).__init__()
class emotionRecog(Screen):
def __init__(self, **kwargs):
super(emotionRecog, self).__init__(**kwargs)
self.button1 = Button(text="Next", size_hint=(1, .1))
self.button1.bind(on_press=self.screenTransition())
layout = BoxLayout(orientation="vertical")
layout.add_widget(self.button1)
return layout
def screenTransition(self, *args):
self.manager.current = 'test'
class CamApp(App):
def build(self):
sm = ScreenManagement(transition=FadeTransition())
sm.add_widget(emotionRecog(name='emotion'))
sm.add_widget(testW(name='test'))
return sm
if __name__ == "__main__":
CamApp().run()
运行后我得到这些错误
Traceback (most recent call last):
File "C:\Study\KivyMultiScreen\main.py", line 53, in <module>
CamApp().run()
File "C:\Study\KivyMultiScreen\main.py", line 47, in build
sm.add_widget(emotionRecog(name='emotion'))
File "C:\Study\KivyMultiScreen\main.py", line 35, in __init__
self.button1.bind(on_press=self.screenTransition())
File "C:\Study\KivyMultiScreen\main.py", line 41, in screenTransition
self.manager.current = 'test'
AttributeError: 'NoneType' object has no attribute 'current'
Process finished with exit code 1
你能帮帮我吗?
您应该将回调本身绑定到on_press
操作。 这样,Kivy 可以稍后调用该函数。
改变
self.button1.bind(on_press=self.screenTransition())
至
self.button1.bind(on_press=self.screenTransition)
您的脚本引发该特定错误的原因是Screen.manager
尚未设置在您在该行中调用self.screenTransition
的位置。
您还可以查看Kivy 文档中的前几个示例。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.