[英]Kivy - How to access kivy widget in python?
我想在kivy中編輯TextInput中的文本,但不知道如何,因為我已經在網上搜索了此代碼,但還是沒有運氣。
class MainApp(Screen):
def __init__(self,**kwargs):
super(MainApp,self).__init__(**kwargs)
pass
class Forms(BoxLayout):
def __init__(self, **kwargs):
super(Main,self).__init__(**kwargs)
self.ids.txtSearch.text = "new text"
class Main(App):
def build(self):
return root_widget
if __name__ == "__main__":
Main().run()
------kivy-------
<Main>:
TextInput:
id: txtSearch
這不是我的全部代碼,但我認為這些才是問題所在
這是錯誤:
File "C:\Users\Guest\Documents\Python\Kivy\Project\main.py", line 295, in <module>
''')
File "D:\Kivy-1.9.0-py3.4-win32-x64\kivy34\kivy\lang.py", line 1828, in load_string
self._apply_rule(widget, parser.root, parser.root)
File "D:\Kivy-1.9.0-py3.4-win32-x64\kivy34\kivy\lang.py", line 1985, in _apply_rule
self.apply(child)
File "D:\Kivy-1.9.0-py3.4-win32-x64\kivy34\kivy\lang.py", line 1872, in apply
self._apply_rule(widget, rule, rule)
File "D:\Kivy-1.9.0-py3.4-win32-x64\kivy34\kivy\lang.py", line 1986, in _apply_rule
self._apply_rule(child, crule, rootrule)
File "D:\Kivy-1.9.0-py3.4-win32-x64\kivy34\kivy\lang.py", line 1986, in _apply_rule
self._apply_rule(child, crule, rootrule)
File "D:\Kivy-1.9.0-py3.4-win32-x64\kivy34\kivy\lang.py", line 1983, in _apply_rule
child = cls(__no_builder=True)
File "C:\Users\Guest\Documents\Python\Kivy\Project\main.py", line 40, in __init__
self.ids.txtSearch.text = "new text"
File "kivy\properties.pyx", line 720, in kivy.properties.ObservableDict.__getattr__ (kivy\properties.c:10911)
AttributeError: 'super' object has no attribute '__getattr__'
要在kivy中更改Widgets屬性,您需要先在.py和.kv文件之間“鏈接” .py和.kv文件:
txt_Search = ObjectProperty()
然后在.kv文件的根窗口小部件中:
txt_Search: txtSearch
然后將ID分配給小部件(就像您已經做的那樣):
<Main>:
TextInput:
id: txtSearch
text: ' '
然后在您的.py文件中,您可以通過以下方式更改小部件的屬性:
self.txt_Search.text = 'New Text'
或任何其他屬性:
self.txt_Search.height = '30dp'
嘗試為其分配text
時,您確定self.ids.txtSearch
存在嗎? 您在上面的一行中調用了super(Main,self)
,所以我猜txtSearch
從未實例化。
順便說一句,最好在*.kv
文件中初始化小部件:
<Main>:
TextInput:
id: txtSearch
text: "new text"
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