如何更改kivy中另一类标签的行为

Question

我想创建一个页面，显示一个表单和一个提交按钮，当点击它时，它将带您到另一个页面，该页面将显示从表单页面输入的数据

我创建了两个类表单和配置文件，但当我单击表单按钮时，它将带您进入配置文件页面，但没有任何更改

我尝试过很多事情，但都做不到，请帮忙

.py文件

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen



class Manager(ScreenManager):
    pass

class Profile(Screen):
    profile_name = ObjectProperty()
    profile_matric = ObjectProperty()
    profile_school = ObjectProperty()
    profile_programme = ObjectProperty()
    profile_level = ObjectProperty()
    
    def make_changes(self):
        self.ids.profile_name = 'New name'
        

class Form(Screen):
    user_name = ObjectProperty()
    matric = ObjectProperty()
    school = ObjectProperty()
    programme = ObjectProperty()
    level = ObjectProperty()
    
    
    def submit(self):
        y = Profile()
        y.make_changes()

kv = Builder.load_file('main.kv')

class SpinApp(App):
    def build(self):
        return kv
        
if __name__ == '__main__':
    SpinApp().run()

.kv文件

Manager:
    Form:
    Profile:


<Form@BoxLayout>:
    name: 'form'
    orientation: 'vertical'
    
    user_name: user_name
    matric: matric
    school: school
    programme: programme
    level: level
    
    RelativeLayout:
        GridLayout: 
            cols: 1
            #size_hint: (0.8, 0.8)
            spacing: 5
            padding: [20]
            pos_hint: {'center_x':.5, 'center_y':.5}
            background_normal: ''
        
    
            GridLayout:
                cols: 2
                Label:
                    text: '\nName'
                    size_hint_x: None
                    size: self.texture_size
                    pos_hint: {'left': 1}
                    bold: True
                    size_hint_y: None
                    height: 80
                Input_text:
                    id: user_name
                    hint_text: 'enter your full name'
            
            GridLayout:
                cols: 2     
                Input_label:
                    text: '\nMatric Number'
                Input_text:
                    id: matric
                    hint_text: 'eg. se/mat-csc/19/0000'
            
            GridLayout:
                cols: 2
                Input_label:
                    text: '\nSchool'
                Input_text:
                    id: school
                    hint_text: 'your school'
                    
            GridLayout:
                cols: 2
                Input_label:
                    text: '\nLevel'
                Input_text:
                    id: level
                    hint_text: 'Enter your level'
                
            GridLayout:
                cols: 2
                Input_label:
                    text: '\nProgramme'
                Input_text:
                    id: programme
                    hint_text: 'type your programme'
                    
            Button:
                text: 'submit'
                on_release:
                    app.root.current = 'profile'
                    root.submit()
                


<Profile@BoxLayout>:
    name: 'profile'
    orientation: 'vertical'
    
    profile_name: profile_name
    profile_matric: profile_matric
    profile_level: profile_level
    profile_school: profile_school
    profile_programme: profile_programme

    RelativeLayout:
        GridLayout: 
            cols: 1
            size_hint: (0.8, 0.8)
            spacing: 5
            padding: [20]
            pos_hint: {'center_x':.5, 'center_y':.5}
            background_normal: ''
            canvas.before:
                Color:
                    rgba:  (253/255, 245/255, 230/255, 1)
                RoundedRectangle:
                    size: self.size
                    pos: self.pos
                    radius: [15]
                    
                
            
            Image:
                source: 'slde_1.png'
                size: self.texture_size
            
            profile_label:
                id: profile_name
                text: 'Name: '
            profile_label:
                id: profile_matric
                text: 'Matric no.:'
            profile_label:
                id: profile_level
                text: 'Level:'
            profile_label:
                id: profile_school
                text: 'School:'
            profile_label:
                id: profile_programme
                text: 'Programme:'
        

<profile_label@Label>:
    color: 1,1,1,1
    bold: True
    font_size: 30
    size_hint_y: None
    height: 85
    text_size: self.size
    halign: 'left'
    valign: 'middle'
    padding: [10,0]
    canvas.before:
        Color:
            rgba:  47/255, 79/255, 79/255, 1
        RoundedRectangle:
            size: self.size
            pos: self.pos
            radius: [25]

<Input_label@Label>:
    size_hint_x: None
    size: self.texture_size
    pos_hint: {'left': 1,}
    size_hint_y: None
    height: 80
    bold: True
    
<Input_text@TextInput>:
    multiline: False
    size_hint_y: None
    height: 80
    padding: [10,20]
    background_normal: ''
    background_color: 240/255, 248/255, 1, 1
    valign: 'bottom'

Answer 1

在Profile类中，可以添加on_enter()方法。每次输入ProfileScreen时都会执行on_enter()方法。比如说：

class Profile(Screen):
    profile_name = ObjectProperty()
    profile_matric = ObjectProperty()
    profile_school = ObjectProperty()
    profile_programme = ObjectProperty()
    profile_level = ObjectProperty()

    def on_enter(self, *args):
        form = self.manager.get_screen('form')
        self.profile_name.text = form.user_name.text
        self.profile_matric.text = form.matric.text
        self.profile_school.text = form.school.text
        self.profile_programme.text = form.programme.text
        self.profile_level.text = form.level.text

然后在kv中submit{}只需更改Screen：

        Button:
            text: 'submit'
            on_release:
                app.root.current = 'profile'