Kivy recycleview 重复数据项

Question

我在 kivy 中有一个回收视图，我用一个包含文本和图像的列表写给它，文本很好，但是一旦我写了一个图像，它就会在我向下滚动时复制视图中的图像，请参阅下面的代码，我将如何阻止这种情况发生，这是我的 kv 文件我有一个包含两组数据的 boxlayout，还有一张问题的图片example

kv file:

 <SelectableReportTextbox@BoxLayout>:


    text: ''
    imagesource: ''
    color: ''


    Button:
            size_hint:  .8, 1
            text_size : self.text_size
            size_hint_y: None
            foreground_color: [1, 1, 1, 1]
            background_color: (0.2, 0.4, 0.8, 0.9) # root.color
            font_name: 'C:\kivy_venv\Graphics\GIL_____.TTF'
            font_size: self.height*0.2
            background_normal: root.imagesource
            text: root.text





  ScreenTwo:

    rv2: rv2


    canvas.before:


            Rectangle:
                    size:self.size           #100, 100
                    pos: self.pos
                    source: "C:\kivy_venv\Graphics\Jetfireback.png" 



    RecycleView_B:


            bar_width: 6
            size_hint: (None, None)
            do_scroll_y: True
            id: scrlv2
            size: (500, 500)
            pos_hint: {'center_x': .75, 'center_y': .64}
            multiline:True



            ProjectRV:


                    viewclass: 'SelectableReportTextbox'        #  
                    orientation: "horizontal"
                    scroll_type: ['bars', 'content']
                    scroll_wheel_distance: dp(114)
                    key_size: "height"

                    padding:1, 1
                    space_x: self.size[0]/3
                    id: rv2
                    pos_hint: {'center_x': 0.32, 'center_y': 0.525}
                    bar_width: dp(25)
                    bar_color: (0.7, 0.1, 0.3, 0.7)
                    bar_inactive_color: (0.1, 0.1, 0.1 , 1)
                    scroll_y : 0



                    SelectableRecycleBoxLayout:
                            rv2:rv2

                            spacing : '6'
                            default_size_hint: 1, None
                            size_hint_y: None
                            size_hint_x: 1

                            height: self.minimum_height
                            multiselect: True
                            touch_multiselect: True
                            orientation: 'vertical'

main.py:

class SelectableRecycleBoxLayout(FocusBehavior,LayoutSelectionBehavior,RecycleBoxLayout):   
''' Adds selection and focus behaviour to the view. '''



 class SelectableReportTextbox(RecycleDataViewBehavior):
        selectable = BooleanProperty(True)
        index =None

        selected = BooleanProperty(False)
def __init__(self, **kw):
    super().__init__(**kw)
def refresh_view_attrs(self, rv, index, data):

    ''' Catch and handle the view changes '''
    self.index = index
    return super(SelectableRecycleBoxLayout, self).refresh_view_attrs(
        rv, index, data)


class ProjectRV(RecycleView):


def __init__(self, **kwargs):
    super(ProjectRV, self).__init__(**kwargs)




 class RecycleView_B(RecycleView):

      pass

  class ScreenTwo(Screen):

        TEXT_FILE = open("output.txt", "a")

        zdata = re.search('{.*,', strdata).group(0)   
        splitex = zdata.split(':' + "'")[1]

        print (zdata)

        TEXT_FILE.write(zdata)

        TEXT_FILE.close()

        with open("output.txt", "r") as f:

           txtdata = eval(str('[' + ''.join(f.readlines()) + ']'))#ast.literal_eval

           nstring = type(txtdata)

           self.rv2.data = txtdata
           self.rv2.refresh_from_viewport()
           self.rv2.refresh_from_data()

Answer 1

RecycleView 重复使用 viewclass 对象实例，并根据 data 字典设置这些实例的属性。因此，如果您的字典之一设置了 viewclsas 实例的 imagesource 属性，然后该实例被重新用于未设置 imagesource 属性的字典，则该实例将保留 @ 的先前值987654327@。解决方法是确保data 中的每个字典都包含viewclass 的每个属性的值。每个字典都需要包含 text、imagesource 和 color 的值，即使值是 ''。