kivy 如何在 TextInput 中获取文本？

Question

登录系统；我有这个 error.How 来获取 txt1 中的文本以及如何通过按钮更改？

文件“/home/hypermesh/Desktop/main.py”，第 11 行，在 messageShow 中如果 self.txt1.text == "stock": AttributeError: 'Button' 对象没有属性 'txt1'

#-*- coding: utf-8 -*-
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.popup import Popup
from kivy.uix.textinput import TextInput
from kivy.uix.gridlayout import GridLayout
from kivy.uix.widget import Widget

def messageShow(self):
    if self.txt1.text == "stock":
        pop=Popup(text="yes")
    else:
        pop=Popup(text="error")

class SimpleKivy(App):

    def build(self):
        grid=GridLayout(rows=3, cols=2)
        lbl1=Label(text="ID :",italic=True, bold=True)
        lbl2=Label(text="Password :",italic=True, bold=True)
        txt1=TextInput(multiline=False, font_size=50)
        txt2=TextInput(multiline=False, password=True)
        btn1=Button(text="Exit",italic=True)
        btn2=Button(text="OK",italic=True)

        btn2.bind(on_press=messageShow)

        grid.add_widget(lbl1)
        grid.add_widget(txt1)
        grid.add_widget(lbl2)
        grid.add_widget(txt2)
        grid.add_widget(btn1)
        grid.add_widget(btn2)
        return grid

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

Answer 1

你做对了......但是你必须保存对以后要访问的内容的引用（通常将其附加到自己）

def __init__(...):
    ...
    self.txt1=TextInput(multiline=False, font_size=50)
    ...

那么你的其他功能应该可以正常工作（除了该方法应该是 class.. 的一部分）

class SimpleKivy(App):
    def messageShow(self,evt):
        if self.txt1.text == "stock":
            pop=Popup(text="yes")
        else:
            pop=Popup(text="error")

    def build(self):
        grid=GridLayout(rows=3, cols=2)
        lbl1=Label(text="ID :",italic=True, bold=True)

另一种方法是使用 lambda 来调用它

def messageShow(message):
     print "GOT MESSAGE:",message

class SimpleKivy(App):
     def __init__(self,...):
         txt1 = TextInput(...)
         ...
         btn.bind(on_press=lambda *a:messageShow(txt1.text))

在这种情况下，txt1 在变量范围内并且能够将其字符串传递给 messageShow

Answer 2

感谢此代码有效 :)

def messageShow(message):
    if message == "stock":
        btn3=Button(text='Close me!')
        pop=Popup(content=btn3, title='Information Message !')
        pop.open()
        btn3.bind(on_press=pop.dismiss)

    else:
        btn3=Button(text='Exit')
        pop=Popup(content=btn3, title='Information Message !')
        pop.open()
        btn3.bind(on_press=pop.dismiss)

class LoginScreen(GridLayout):
    def __init__(self):
        super(LoginScreen, self).__init__()
        self.rows=3
        self.cols=2
        lbl1=Label(text="ID :",italic=True, bold=True)
        lbl2=Label(text="Password :",italic=True, bold=True)
        txt1=TextInput(multiline=False, font_size=50)
        txt2=TextInput(multiline=False, password=True)
        btn1=Button(text="Exit",italic=True)
        btn2=Button(text="OK",italic=True)
        btn2.bind(on_press=lambda *a:messageShow(txt1.text))
        self.add_widget(lbl1)
        self.add_widget(txt1)
        self.add_widget(lbl2)
        self.add_widget(txt2)
        self.add_widget(btn1)
        self.add_widget(btn2)

class SimpleKivy(App):
    def build(self):
        return LoginScreen()

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

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