python - 在屏幕管理器 (Kivy) 中控制小部件的属性

问题描述

我是新来的基维。我正在尝试制作一个由多个屏幕组成的应用程序。每个屏幕都包含一个布局和一些小部件。我想从我的按钮中获得常用功能，而不仅仅是切换屏幕。例如，我想使用按钮的 on_press 方法更改标签的文本。我怎样才能做到这一点？这是我的 .py 代码：

import kivy
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty, NumericProperty
from kivy.animation import Animation
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition

class ScreenOne(Screen):
   flo = ObjectProperty(None)
   def b1p(self, instance):
        global psss
        psss = "1"+psss
        print("okok")

        print(Manager.__dict__)
        print(root.ids.screen_one.ids.label1.text)
##        print(ScreenOne.flo.button1.text)
        instance.text = "hk"
class ScreenTwo(Screen):
    pass
class ScreenThree(Screen):
    pass
global psss
psss= ""
class Manager(ScreenManager):
##    font_sizte = NumericProperty(20)

    screen_one = ObjectProperty(None)
    screen_two = ObjectProperty(None)
    screen_three = ObjectProperty(None)
    def b1p(self):
        global psss
        psss = "1"+psss
        print("okok")
##        self.button1.text = "hi" 


class ScreensApp(App):
    font_size_pssscreen = 30
    shx_pssscreen = 0.1
    shy_pssscreen = 0.15
    def build (self):
        return Manager()

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

和.kv代码：

#:kivy 1.8.0
<ScreenOne>:
    flo : flo
    FloatLayout:
        id:flo

        label1 : label1
        button1:button1
        button2:button2
        button3:button3
        button4:button4
        button5:button5
        button6:button6
        button7:button7
        button8:button8
        button9:button9
        Button:
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            id:button1
            pos_hint:{"x":.3,"top":.75}
            back_color:.1,.3,.6,1
            text:"1"
            on_press:root.b1p(root.manager)
            #on_press: self.text +=root


        Button:
            id:button2
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.45,"top":.75}
            text:"2"
            on_press:button2.text:"jio"
        Button:
            id:button3
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.6,"top":.75}
            text:"3"
        Button:
            id:button4
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.3,"top":.55}
            text:"4"
            on_press:root.manager.current = 'screen2'
        Button:
            id:button5
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.45,"top":.55}
            text:"5"
        Button:
            id:button6
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.6,"top":.55}
            text:"6"
        Button:
            id:button7
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.3,"top":.35}
            text:"7"
        Button:
            id:button8
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.45,"top":.35}
            text:"8"
        Button:
            id:button9
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.6,"top":.35}
            text:"9"    
        Label:
            id:label1
            font_size :app.font_size_pssscreen
            color:0.3,0.6,0.7,1
            size_hint:app.shx_pssscreen,app.shy_pssscreen
            pos_hint:{"x":0.0,"top":1.3}
            text:"w"







<ScreenTwo>:
    Button:
        text:"hi"
<ScreenThree>:
    Button:
        text:"hi"
<Manager>:
    id: screen_manager
    screen_one: screen_one
    screen_two:screen_two
    screen_three:screen_three

    ScreenOne:
        id:screen_one
        name: 'screen1'
        manager:screen_manager
    ScreenTwo:
        id:screen_two
        name: 'screen2'
        manager:screen_manager
    ScreenThree:    
        id:screen_three
        name: 'screen3'
        manager:screen_manager

标签： pythonkivyscreen

class ScreenOne(Screen): flo = ObjectProperty(None) def b1p(self, instance): global psss psss = "1"+psss print("okok") # next line changes the text of label1 self.ids.label1.text = 'Changed Text'

python - 在屏幕管理器 (Kivy) 中控制小部件的属性

问题描述

解决方案

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