首先,当从 kv 调用该方法时,必须将按钮实例显式传递给该方法:
on_press: app.Pressbtn(self)
然后您可以使用实例引用来修改按钮或查看其属性,您不需要id
。如果您想获得id
,你只能使用ids
按钮父级的字典。
基于您的代码的示例:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
kv_file = '''
<MyButton@Button>:
color: .8,.9,0,1
font_size: 32
<KVMyHBoxLayout>:
orientation: 'vertical'
MyButton:
id:"idBtn1"
text: "Btn1"
background_color: 1,0,0,1
on_press:app.Pressbtn(self)
MyButton:
id:"idBtn2"
text: "Btn2"
background_color: 0,1,0,1
on_press:app.Pressbtn(self)
Label:
id: lobj
text: "Object"
background_color: 1,0,1,1
Label:
id: lid
text: "ID"
background_color: 0,0,1,1
Label:
id: ltext
text: "Text"
background_color: 1,0,1,1
'''
class KVMyHBoxLayout(BoxLayout):
pass
class ExampleApp(App):
def Pressbtn(self, instance):
instance.parent.ids.lobj.text = str(instance)
instance.parent.ids.ltext.text = instance.text
instance.parent.ids.lid.text= self.get_id(instance)
def get_id(self, instance):
for id, widget in instance.parent.ids.items():
if widget.__self__ == instance:
return id
def build(self):
Builder.load_string(kv_file)
return KVMyHBoxLayout()
if __name__ == "__main__":
app = ExampleApp()
app.run()
Output:
Edit:
如果您在 .py 文件中定义小部件(按钮),则不需要将实例传递给函数,它会作为参数自动传递:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.button import Button
from kivy.uix.scrollview import ScrollView
class FirstScreen(Screen):
def __init__(self,**kwargs):
super(FirstScreen, self).__init__(**kwargs)
layout=BoxLayout(orientation="vertical",size_hint_y= None)
layout.bind(minimum_height=layout.setter('height'))
for i in range(50):
btn = Button(text="Button"+str(i),
id=str(i),
size_hint=(None, None),
on_press=self.Press_auth) #<<<<<<<<<<<<<<<<
layout.add_widget(btn)
root = ScrollView()
root.add_widget(layout)
self.add_widget(root)
def Press_auth(self,instance):
print(str(instance))
class TestScreenManager(ScreenManager):
def __init__(self, **kwargs):
super(TestScreenManager, self).__init__(**kwargs)
self.add_widget(FirstScreen())
class ExampleApp(App):
def build(self):
return TestScreenManager()
def main():
app = ExampleApp()
app.run()
if __name__ == '__main__':
main()