英文:
In a Kivy form, how to add a new button dinamically to RecycleView using Python3?
问题
以下是您的代码的翻译部分：
我有一个带有一个Recycleview的Kivy表单。我想通过点击一个简单的按钮来动态添加一个按钮到我的Recycleview中。
我的Python3脚本：
from kivy.app import App
from kivy.lang.builder import Builder
from kivy.uix.recycleview import RecycleView
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
self.data = []
class app(App):
rv = RV()
def build(self):
return Builder.load_file('lab.kv')
def add_to_rv(self):
self.rv.data.append('ok')
# 我应该使用哪个命令来在Recycleview中显示新按钮和新数据？
app().run()
我的kv文件：
BoxLayout:
RV:
id: rv
viewclass: 'Button'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
Button:
text: '添加到RV'
on_press: app.add_to_rv()
英文:
I have a Kivy form with one Recycleview. I would dinamically add a button to my Recycleview, by clicking a simple Button.
My Python3 script:
from kivy.app import App
from kivy.lang.builder import Builder
from kivy.uix.recycleview import RecycleView
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
self.data=[]
class app(App):
rv=RV()
def build(self):
return Builder.load_file('lab.kv')
def add_to_rv(self):
self.rv.data.append('ok')
# which command i should use to show new button in recycleview with new data?
app().run()
My kv file:
BoxLayout:
RV:
id:rv
viewclass:'Button'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
Button:
text:'ADD TO RV'
on_press:app.add_to_rv()
答案1
得分: 1
你的add_to_rv()方法正在向self.rv的数据中添加内容。但是，self.rv是在以下语句中定义的：
rv=RV()
这会创建一个新的RV实例。然而，在你的GUI中没有使用这个RV实例。在你的GUI中显示的RV实例是通过以下代码行构建的：
return Builder.load_file('lab.kv')
这两个实例没有关联。修复方法是在你的add_to_rv()方法中访问正确的RV实例，如下所示：
def add_to_rv(self):
self.root.ids.rv.data.append({'text': 'ok'})
另外，请注意，data是一个包含字典的列表。你可以省略rv=RV()这一行。
英文:
Your add_to_rv() method is adding to the data of self.rv. But self.rv is defined in the statement:
rv=RV()
which creates a new instance of RV. However, that instance of RV is not used in your GUI. The instance of RV that is displayed in your GUI is built by the line of code:
return Builder.load_file('lab.kv')
And those two instances are not related. The fix is to access the correct instance of RV in your add_to_rv() method like this:
def add_to_rv(self):
self.root.ids.rv.data.append({'text': 'ok'})
Also, note that the data is a list of dictionaries. And you can eliminate the rv=RV() line.
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