Kivy，Python3.5 - 将用户文本输入绑定到 class 中的方法

Question

嘿，这可能是一个愚蠢的问题，它可能是，但这是一个愚蠢的问题，在过去的几天里让我非常沮丧，所以我不得不问，你们中的任何一个伙计们帮我将单行文本输入绑定到 class 中的方法？这是我的代码，我是新手，所以欢迎任何其他批评，这将帮助我改进，并感谢您提前抽出时间。

#//Random number generator//

import kivy
kivy.require('1.7.0')

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.properties import ObjectProperty
from kivy.event import EventDispatcher
from kivy.properties import StringProperty
from kivy.uix.boxlayout import BoxLayout
import string
import random
from kivy.lang import Builder

Builder.load_string("""
<RootWidget>:
    BoxLayout:
        orientation: 'horizontal'
        canvas.before:
            Rectangle:
                pos: self.pos
                size: self.size
                source: "code.jpg"
        BoxLayout:
            orientation: "vertical"
            padding: 20
            spacing: 10

            AsyncImage:
                source: "img.png"
                size_hint: 1, 1
                pos_hint: {'center_x':.5, 'center_y': .5}

            Label:
                id: label_1
                text: root.data_model.c
                font_size: 17
                text_size: self.width, None
                color: [0,255,0]
                size_hint_y: .3
                pos_hint_y: {'center_x':.5, 'center_y': .5}

#-----------> Here <-------------

            TextInput:
                id: txt_inpt1
                text: "Lenght (optional)"
                size_hint_y: .2
                on_text: root.check_status(f_but)

# --------------> And Here <-----------------

            TextInput:
                id: txt_inpt2
                text: "Specific characters (optional)"
                size_hint_y: .2
                on_text: root.check_status(f_but)

            Button:
                id: btn_1
                text: "Generate"
                pos_hint_y: 
                on_press: root.button_press()
                size_hint_y: .3 
""")

class DataModel(EventDispatcher):
    b = StringProperty("")
    c = StringProperty("")

    def __init__(self, *args, **kwargs):
        super(DataModel, self).__init__(*args, **kwargs)
        self.bind(b=self.set_c)

    def set_c(self, instance, value):
        self.c = self.b


class RootWidget(BoxLayout):
    data_model = ObjectProperty(DataModel())

    def button_press(self, *args):

#---------> I want size to equal txt_inpt1 and chars txt_inpt2 <----------

        def id_generator(size=12, chars=string.ascii_uppercase + string.digits):
            return ''.join(random.choice(chars) for _ in range(size))

        text = id_generator()  
        self.data_model.b = text
        print (self.data_model.c)

class TestApp(App):

    def build(self):
        return RootWidget()

app = TestApp()
app.run()

Answer 1

您可以使用 ids 属性（字典）访问这些小部件：

def id_generator():
    try:
        size = int(self.ids['txt_inpt1'].text)
    except ValueError:
        size = 12

    chars = self.ids['txt_inpt2'].text or (string.ascii_uppercase + string.digits)
    return ''.join(random.choice(chars) for _ in range(size))

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