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Lev145
Asked:2020-03-13 06:20:03 +0000 UTC2020-03-13 06:20:03 +0000 UTC

未导入 Kivy MD 的小部件

  • 772

这是一个简单应用程序的代码：

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.lang import Builder
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.boxlayout import BoxLayout

from kivymd.app import MDApp
from kivymd.theming import ThemeManager



Builder.load_string =('''


<Cont>:
    rows: 2

    c: C
    c1: C1
    c2: C2
    m1: M1
    m2: M2

    BoxLayout:
        orientation: 'vertical'
        padding: [70]
        spacing: 100

        MDTextField:
            id: C
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: C1
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: C2
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: M1
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: M2
            size_hint: (1, .1)
            font_size: (100)
            multiline: False



    BoxLayout:
        size_hint: (1,.2)
        padding: [40,0,40,20]

        MDIconButton:
            text: 'test'
            on_press: root.cal()

''')

def get(c1,c2,m1,m2,c):

    if c == '?':
        c = 1
    if c1 == '?':
        c1 = 1
    if c2 == '?':
        c2 = 1
    if m1 == '?':
        m1 = 1
    if m2 == '?':
        m2 = 1




    c1 = float(c1)
    c2 = float(c2)
    m1 = float(m1)
    m2 = float(m2)
    c = float(c)

    Ans_C = str((c1*m1+c2*m2)/(m1+m2))
    Ans_C1 = str((c*m1+c*m2-c2*m2)/(m1))
    Ans_C2 = str((c*m1+c*m2-c1*m1)/(m2))
    Ans_M1 = str((c2*m2-c*m2)/(c-c1))
    Ans_M2 = str((c1*m1-c*m1)/(c-c2))



    return {
    'C': Ans_C,
    'C1': Ans_C1,
    'C2': Ans_C2,
    'M1': Ans_M1,
    'M2': Ans_M2
    }



class Cont(GridLayout):

    def cal(self):



        i1 = self.c1.text
        i2 = self.c2.text
        i3 = self.m1.text
        i4 = self.m2.text
        i5 = self.c.text

        gett = get(i1,i2,i3,i4,i5)


        if self.c.text == '?':
            self.c.text = gett.get('C')
        if self.c1.text == '?':
            self.c1.text = gett.get('C1')
        if self.c2.text == '?':
            self.c2.text = gett.get('C2')
        if self.m1.text == '?':
            self.m1.text = gett.get('M1')
        if self.m2.text == '?':
            self.m2.text = gett.get('M2')




class App(App):
    theme_cls = ThemeManager()
    title = 'Test'

    def build(self):
        self.theme_cls.theme_style = 'Dark'


        return Cont()

if __name__ == "__main__":
    App().run()

并且由于某种原因，应用程序在启动时出现空白屏幕： 在此处输入图像描述 我搜索并重新阅读了很多文档，但没有找到答案，我的错误在哪里？

同时，kivy MD 中的 ThemeManager 工作，很可能问题出在我的代码中不起作用的小部件中。

python

2 个回答

  1. Best Answer

    像这样的东西：

    from kivy.uix.gridlayout import GridLayout
from kivy.lang import Builder
from kivy.uix.textinput import TextInput
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.boxlayout import BoxLayout

from kivymd.app import MDApp
from kivymd.theming import ThemeManager

KV = '''
<Cont>:
    rows: 2

    c: C
    c1: C1
    c2: C2
    m1: M1
    m2: M2

    BoxLayout:
        orientation: 'vertical'
        padding: [70]
        spacing: 100

        MDTextField:
            id: C
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: C1
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: C2
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: M1
            size_hint: (1, .1)
            font_size: (100)
            multiline: False
        MDTextField:
            id: M2
            size_hint: (1, .1)
            font_size: (100)
            multiline: False

    BoxLayout:
        orientation: 'vertical'
        padding: 70
        spacing: 100




    BoxLayout:
        size_hint: (1,.2)
        padding: [40,0,40,20]

        MDIconButton:
            text: 'test'
            on_press: root.cal()

Screen:
    Cont:

'''


class Cont(GridLayout):

    def get(c1, c2, m1, m2, c):

        if c == '?':
            c = 1
        if c1 == '?':
            c1 = 1
        if c2 == '?':
            c2 = 1
        if m1 == '?':
            m1 = 1
        if m2 == '?':
            m2 = 1

        c1 = float(c1)
        c2 = float(c2)
        m1 = float(m1)
        m2 = float(m2)
        c = float(c)

        Ans_C = str((c1 * m1 + c2 * m2) / (m1 + m2))
        Ans_C1 = str((c * m1 + c * m2 - c2 * m2) / (m1))
        Ans_C2 = str((c * m1 + c * m2 - c1 * m1) / (m2))
        Ans_M1 = str((c2 * m2 - c * m2) / (c - c1))
        Ans_M2 = str((c1 * m1 - c * m1) / (c - c2))

        return {
            'C': Ans_C,
            'C1': Ans_C1,
            'C2': Ans_C2,
            'M1': Ans_M1,
            'M2': Ans_M2
        }

    def cal(self):

        i1 = self.c1.text
        i2 = self.c2.text
        i3 = self.m1.text
        i4 = self.m2.text
        i5 = self.c.text

        gett = get(i1, i2, i3, i4, i5)


        if self.c.text == '?':
            self.c.text = gett.get('C')
        if self.c1.text == '?':
            self.c1.text = gett.get('C1')
        if self.c2.text == '?':
            self.c2.text = gett.get('C2')
        if self.m1.text == '?':
            self.m1.text = gett.get('M1')
        if self.m2.text == '?':
            self.m2.text = gett.get('M2')


class App(MDApp):

    def __init__(self, **kwargs):
        self.theme_cls.theme_style = 'Dark'
        super().__init__(**kwargs)

    def build(self):
        return Builder.load_string(KV)

if __name__ == "__main__":
    App().run()
    • 1

  2. 您使用的是过时的 API，显然是过时的 KivyMD 库 - https://kivymd.readthedocs.io/en/0.104.0/getting-started.html#first-kivymd-application

    • 0

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