猕猴桃scrollview不起作用

Question

我正在尝试在EmployeeScreen类内部使用kivy scrollview。 它不会滚动！？ 我究竟做错了什么？ 希望这不是重复的，请帮忙。 我转到此链接Kivy ScrollView-不滚动 。 这似乎是关于kivy scrollview不滚动的唯一问题。 这没有解决我的问题。

.py文件：

`from kivy.app import App

from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
from kivy.uix.scrollview import ScrollView


from kivy.uix.boxlayout import BoxLayout
from kivy.uix.stacklayout import StackLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout


class LogInScreen(Screen):
    pass
class EmployeeScreen(Screen):
    pass

class Manager(ScreenManager):
    login_screen = ObjectProperty(None)
    employee_screen = ObjectProperty(None)


class CptApp(App):
    icon = 'Images\login\cptlogo.png'
    title = 'CPT'
    def build(self):
        return Manager()


if __name__=='__main__':
    CptApp().run()`

.kv文件：

<Manager>:
id: screen_manager

login_screen: login_screen
employee_screen: employee_screen


LogInScreen:
    id: login_screen
    name: 'login'
    manager: screen_manager

    FloatLayout:
        StackLayout:
            orientation: 'lr-tb'
            canvas:
                Color:
                    rgba: 1,1,1,1
                Rectangle:
                    pos: self.pos
                    size: self.size
            Image:
                size_hint_y: .1
                source: 'Images\login\cptbanner.jpg'
                allow_stretch: True
                keep_ratio: True

            Image: 
                source: 'Images\login\HD7Brw.jpg'
                allow_stretch: True
                keep_ratio: False

    Label:
        size_hint_y: .05
        size_hint_x: .5
        pos_hint: {"x": .25, "y": .7}
        markup: True
        text: '[i][b][color=#000000]USER NAME[/color][/b][/i]'

    TextInput:
        id: 'username_input'
        multiline: False
        size_hint_x: .4
        size_hint_y: .05
        pos_hint: {"x": .3, "y": .65}

    Label:
        size_hint_y: .05
        size_hint_x: .5
        markup: True
        text: '[i][b][color=#000000]PASSWORD[/color][/b][/i]'
        pos_hint: {'x': .25, 'y': .5}

    TextInput:
        id: 'password_input'
        multiline: False
        password: True
        size_hint_x: .4
        size_hint_y: .05
        pos_hint: {'x': .3, 'y': .45}

    Image:
        source: 'Images/login/loginbutton.png'
        size_hint_x: .25
        size_hint_y: .1
        pos_hint: {'x': .375, 'y': .25}

    Button:
        id: 'login_button'
        background_color: 0,0,0,0
        markup: True
        text: '[i][b][color=#000000]LOGIN[/color][/b][/i]'
        size_hint_x: .25
        size_hint_y: .1
        pos_hint: {'x': .375, 'y': .25} 
        on_release: screen_manager.current = 'employeescreen'

EmployeeScreen:
    id: employee_screen
    name: 'employeescreen'
    manager: screen_manager

    StackLayout:
        orientation: 'lr-tb'
        canvas:
            Color:
                rgba: 1,1,1,1
            Rectangle:
                pos: self.pos
                size: self.size
        Image:
            size_hint_y: .1
            source: 'Images\login\cptbanner.jpg'
            allow_stretch: True
            keep_ratio: True

        ScrollView:
            do_scroll_x: False
            size: root.size
            pos: root.pos
            GridLayout:
                cols: 2
                size_hint_y: None
                height: self.minimum_height
                pos: root.pos

                Button:
                    height: 40
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'

Answer 1

我试图在.kv文件中使用GridLayout，错了，我必须创建一个类并覆盖它的init 。

class MyLayout(GridLayout):
    def __init__(self,**kwargs):
        super(MyLayout,self).__init__(**kwargs)
        self.size_hint_y = (None)
        self.bind(minimum_height = self.setter('height'))

然后将类放在GridLayout所在的.kv文件中。