Recycleview AttributeError：'超级'对象没有属性'__getattr__'

Question

请检查以下程序为何给出

EncodedImage placeholder = (EncodedImage) initForm.theme.getImage("avater.png"); icon1 = URLImage.createToStorage(placeholder, "tyrion", "https://www.dropbox.com/s/52tu8jkqg1pikvw/jpeg?dl=1");

.py：

AttributeError: 'super' object has no attribute '__getattr__'

.kv：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ListProperty, NumericProperty, ObjectProperty
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.textinput import TextInput
# from kivy.effects.scroll.ScrollEffect import ScrollEffect 
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.gridlayout import GridLayout
from kivy.uix.recycleboxlayout import RecycleBoxLayout


Builder.load_file('so_extractTIC.kv')


class RecycleItem(ScreenManager,RecycleDataViewBehavior, TextInput):
    index = NumericProperty(0)

    def refresh_view_attrs(self, rv, index, data):
        self.index = index
        return super(RecycleItem, self).refresh_view_attrs(rv, index, data)


class DataView(Screen):
    DataList = ListProperty()
    TextInputNum = NumericProperty(10)
    
    def __init__(self,*args,**kwargs):
        super(DataView, self).__init__(*args,**kwargs)
        # for key, val in self.ids.items():
        #     print("key={0}, val={1}".format(key, val))

        data12= []    
        for x in range(self.TextInputNum):
            data12.append({'text': '', 'height': 50})
        self.ids.rv.data = data12

    def extract_data(self,rv):
        print(self.parent.parent.parent)
        self.DataList.clear()
        for x in range(self.TextInputNum):
            self.DataList.append(self.ids.rv.data[x]['text'])
        print(self.DataList)
        




class RootWidget(ScreenManager):
    pass

class MainApp(App):
    def build(self):
        # self.root = Builder.load_string(APP_KV)
        return RootWidget()

if __name__ == '__main__':
    MainApp().run()

我一直在搜索使用textInput框从recycleview提取数据。请找到查询链接：

Retrieve Data from Kivy Recycleview

我正在尝试从ScreenManager继承，但是它给出了'super'属性错误。尝试在.kv中将id作为参数传递，并尝试找到真正的父对象，但无济于事。

另外，请提出如何使用上面的代码来回收GridLaout的二维行和列，我尝试使用for循环，但是遇到了与键有关的错误。 喜欢：

<DataView>:
    BoxLayout:        
        orientation: 'vertical'
        RecycleView:
            
            size_hint_y: 0.9
            viewclass: 'RecycleItem'
            id: rv
            key_size: 'size'
            # effect_cls: ScrollEffect
            cols: 1
            RecycleBoxLayout:
                id: rvbox
                cols: rv.cols
                orientation: 'vertical'
                size_hint_y: None
                height: self.minimum_height
                default_size_hint: 1, None
        Button:
            text: 'Submit'
            size_hint_y: 0.1
            on_release: root.extract_data()

<RecycleItem>:
    on_text: self.parent.parent.data[self.index]['text'] = self.text



<RootWidget>:
    DataView:
        name:"DataView_screen"

谢谢！

Answer 1

在您的DataView类中，__init__()方法引用了self.ids，但此时ids尚不可用。您可以像这样使用Clock.schedule_once()来延迟引用：

def __init__(self, *args, **kwargs):
    super(DataView, self).__init__(*args, **kwargs)
    # for key, val in self.ids.items():
    #     print("key={0}, val={1}".format(key, val))

    Clock.schedule_once(self.setup_data)

def setup_data(self, dt):
    data12 = []
    for x in range(self.TextInputNum):
        data12.append({'text': '', 'height': 50})
    self.ids.rv.data = data12

我没有理由将RecycleItem设为ScreenManager的子类。

在您的'kv , the on_text line for RecycleItem`中可以是：

<RecycleItem>:
    on_text: app.root.get_screen('DataView_screen').ids.rv.data[self.index]['text'] = self.text

提交Button可以是：

    Button:
        text: 'Submit'
        size_hint_y: 0.1
        on_release: root.extract_data(rv)