当我选择微调器值（即官方）以及当我选择微调器值正常隐藏标签时，如何创建标签？

Question

[这里我已将我的代码粘贴到 GitHub 中，请查看] {https://github.com/BollamReddy-Python-Vba/python/commit/710bd80f649968cd19181e0abda21f5164e8ba9f}

import kivy
kivy.require('1.10.0')
from kivy.core.window import Window
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.base import runTouchApp
from kivy.uix.label import Label
from kivy.graphics import Color, Rectangle
from kivy.uix.textinput import TextInput
from kivy.uix.spinner import Spinner
from kivy.uix.checkbox import CheckBox
Window.size = (500, 400)
Window.clearcolor = (0.1, 0.1, 0.3, 0.2)


def show_selected_value(spinner, text):
    print('Selected Process', spinner, 'have text', text)


class LRefConfigAutomation(App):
    config = None

    def build_config(self, config):
        config.setdefaults('LefConfigWindowSection', {
            'PartInputLabel': 'Please Enter your Part No',
            'TypeOfProcessLabel': 'Select Type Of Process',
            'NormalFolderName': 'Enter Normal Folder Name',

        })
        self.config = config

    def build(self):
        config = self.config
        root = FloatLayout()
        lbl = config.get('LefConfigWindowSection', 'PartInputLabel')
        self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .90}, size_hint=(1.0, 1.0), halign="left",valign="middle", font_name='Georgia')
        self.label.bind(size=self.label.setter('text_size'))
        self.label.font_size = '14.5dp'  # something that'll give texture bigger than phone's screen size
        root.add_widget(self.label)
        with self.label.canvas:
            Color(0, 0, 0, 0)
            Rectangle(pos=self.label.pos, size=self.label.size)
        self.txtKemNo = TextInput(pos_hint={"center_x": .66, "center_y": .90}, size_hint=(None, None),font_name="Georgia", size=(100, 30), multiline=False, hint_text="Part Number")
        root.add_widget(self.txtKemNo)
        lbl = config.get('LefConfigWindowSection', 'TypeOfProcessLabel')
        self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .75}, size_hint=(1.0, 1.0), halign="left",valign="middle", font_name='Georgia')
        self.label.bind(size=self.label.setter('text_size'))
        self.label.font_size = '14.5dp'  # something that'll give texture bigger than phone's screen size
        root.add_widget(self.label)
        with self.label.canvas:
            Color(0, 0, 0, 0)
            Rectangle(pos=self.label.pos, size=self.label.size)
        self.requestsspinner = Spinner(
            # default value shown
            text='Select Process',
            # available values will be binded to the combo
            values=("Normal", "Official"),
            # just for positioning in our example
            size_hint=(None, None),
            size=(110, 20),
            pos_hint={'center_x': .66, 'center_y': .75}, font_name='Georgia')
        self.requestsspinner.font_size = '14.5dp'
        self.requestsspinner.bind(text=show_selected_value)
        self.requestsspinner.bind(on_click=self.CreateLable)
        root.add_widget(self.requestsspinner)
        runTouchApp(root)
    def CreateLable(self, spinner, text):
        root = FloatLayout()
        print(text)
        if text == "Normal":
            pass
        elif text == "Official":
            config = self.config
            lbl = config.get('LefConfigWindowSection', 'NormalFolderName')
            print(lbl)
            self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .65}, size_hint=(1.0, 1.0),halign="left",valign="middle", font_name='Georgia')
            self.label.bind(size=self.label.setter('text_size'))
            self.label.font_size = '14.5dp'
            root.add_widget(self.label)
            with self.label.canvas:
                Color(0, 0, 0, 0)
                Rectangle(pos=self.label.pos, size=self.label.size)

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

Answer 1

存在三个问题。首先，您的 build() 方法没有返回 root （这是它打算做的）。删除该行：

runTouchApp(root)

并将其替换为：

return root

其次，您的CreateLable() 没有被调用。我建议改变：

    self.requestsspinner.bind(on_click=self.CreateLable)

到：

    self.requestsspinner.bind(text=self.CreateLable)

第三个问题是在CreateLable() 中您没有将新的Label 添加到显示中。您在该方法中创建的root 与您的显示器的root 无关。我建议将该方法更改为：

def CreateLable(self, spinner, text):
    if text == "Normal":
        pass
    elif text == "Official":
        config = self.config
        lbl = config.get('LefConfigWindowSection', 'NormalFolderName')
        self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .65}, size_hint=(1.0, 1.0),halign="left",valign="middle", font_name='Georgia')
        self.label.bind(size=self.label.setter('text_size'))
        self.label.font_size = '14.5dp'
        self.root.add_widget(self.label)  # add label to the GUI
        with self.label.canvas:
            Color(0, 0, 0, 0)
            Rectangle(pos=self.label.pos, size=self.label.size)

您可能希望在上述方法结束时删除画布说明。它在显示屏的左下角创建了一个不可见的Rectangle。新的Label 的pos 和size 在那个时候仍然是(0,0) 和(100,100) 的默认值，所以这就是Rectangle 被绘制的地方，并且它将保留在哪里。

这是完整的代码：

import kivy
kivy.require('1.10.0')
from kivy.core.window import Window
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
from kivy.graphics import Color, Rectangle
from kivy.uix.textinput import TextInput
from kivy.uix.spinner import Spinner
Window.size = (500, 400)
Window.clearcolor = (0.1, 0.1, 0.3, 0.2)


def show_selected_value(spinner, text):
    print('Selected Process', spinner, 'have text', text)


class LRefConfigAutomation(App):
    config = None

    def build_config(self, config):
        config.setdefaults('LefConfigWindowSection', {
            'PartInputLabel': 'Please Enter your Part No',
            'TypeOfProcessLabel': 'Select Type Of Process',
            'NormalFolderName': 'Enter Normal Folder Name',

        })
        self.config = config

    def build(self):
        config = self.config
        root = FloatLayout()
        lbl = config.get('LefConfigWindowSection', 'PartInputLabel')
        self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .90}, size_hint=(1.0, 1.0), halign="left",valign="middle", font_name='Georgia')
        self.label.bind(size=self.label.setter('text_size'))
        self.label.font_size = '14.5dp'  # something that'll give texture bigger than phone's screen size
        root.add_widget(self.label)
        with self.label.canvas:
            Color(0, 0, 0, 0)
            Rectangle(pos=self.label.pos, size=self.label.size)
        self.txtKemNo = TextInput(pos_hint={"center_x": .66, "center_y": .90}, size_hint=(None, None),font_name="Georgia", size=(100, 30), multiline=False, hint_text="Part Number")
        root.add_widget(self.txtKemNo)
        lbl = config.get('LefConfigWindowSection', 'TypeOfProcessLabel')
        self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .75}, size_hint=(1.0, 1.0), halign="left",valign="middle", font_name='Georgia')
        self.label.bind(size=self.label.setter('text_size'))
        self.label.font_size = '14.5dp'  # something that'll give texture bigger than phone's screen size
        root.add_widget(self.label)
        with self.label.canvas:
            Color(0, 0, 0, 0)
            Rectangle(pos=self.label.pos, size=self.label.size)
        self.requestsspinner = Spinner(
            # default value shown
            text='Select Process',
            # available values will be binded to the combo
            values=("Normal", "Official"),
            # just for positioning in our example
            size_hint=(None, None),
            size=(110, 20),
            pos_hint={'center_x': .66, 'center_y': .75}, font_name='Georgia')
        self.requestsspinner.font_size = '14.5dp'
        self.requestsspinner.bind(text=show_selected_value)
        self.requestsspinner.bind(text=self.CreateLable)
        root.add_widget(self.requestsspinner)
        return root

    def CreateLable(self, spinner, text):
        if text == "Normal":
            pass
        elif text == "Official":
            config = self.config
            lbl = config.get('LefConfigWindowSection', 'NormalFolderName')
            self.label = Label(text=lbl, pos_hint={"center_x": .66, "center_y": .65}, size_hint=(1.0, 1.0),halign="left",valign="middle", font_name='Georgia')
            self.label.bind(size=self.label.setter('text_size'))
            self.label.font_size = '14.5dp'
            self.root.add_widget(self.label)

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