在不使用ID的情况下访问Kivy中的TextInput数据

Question

在这里，我使用for-loop制作了一个装满输入箱的网格，并将它们添加到词典中以访问以后访问，因为我无法在Python文件中设置ID。现在，我正在尝试制作一个可以根据输入箱的数据进行基本计算的函数，但是我不知道如何在不使用ID的情况下传递该功能中的特定输入框。同样，on_text函数无法正常工作。我敢肯定我在这里错过了一些大事。任何指导将不胜感激。

from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.stacklayout import StackLayout
from kivy.uix.scrollview import ScrollView
from kivy.uix.button import Button
from kivy.lang import Builder
from kivy.metrics import dp
from kivy.properties import StringProperty

Builder.load_file("gridtable.kv")

class MyBox(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        pass
class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.cols=6
        self.textinputs = {}
        for i in range(48):
            key = i+1
            self.textinputs[key] = TextInput(multiline=False,font_size=dp(30),on_text=self.calc(key))
            self.add_widget(self.textinputs[key])
        
    def calc(self,key):
        print(self.textinputs[key])

        
class MyApp(App):
    def build(self):
        return MyBox()

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

<MyBox>:
    mygrid:my_grid
    orientation: "vertical"
    MyGrid:
        id: my_grid
        size_hint: 1,0.8
    BoxLayout:
        orientation: "horizontal"
        size_hint: 1,0.2
        BoxLayout:
            orientation: "vertical"
            Button: 
                text: "Expense Total:"
            Button: 
                text: "Revenue Total:"    
        Button:
            text: "Profit:"
            font_size: 40          

Traceback (most recent call last):
   File "c:\Users\jaika\OneDrive\Desktop\python\lil_curry_project\gridtable.py", line 38, in <module>
     MyApp().run()        

     print(self.textinputs[key])
 KeyError: 1

#better version of MyGrid()
class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.cols=4
        self.textinputs = [0]
        self.expense = 0
        self.revenue = 0
        self.profit = 0
        for i in range(16):
            t = TextInput(multiline=False,text=str(i+1))
            t.bind(on_text_validate=self.calc_profit)
            self.textinputs.append(t)
            self.add_widget(t)
        
    def calc_profit(self,instance):
        index = self.textinputs.index(instance)
        if index == 1 or index == 2 or index == 5 or index == 6 or index == 9 or index == 10 or index == 13 or index == 14:
            self.expense += int(instance.text)
        else:
            self.revenue += int(instance.text)
        self.profit = self.revenue - self.expense
        print(self.profit)   

Answer 1

您可以使用bind触发方法调用，也可以使用textInput中可用的事件（例如on_text_validate）。这是一个修改的mygrid类，它都使用：

class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.cols = 6
        self.textinputs = {}
        for i in range(48):
            key = i + 1
            self.textinputs[key] = TextInput(multiline=False, font_size=dp(30), on_text_validate=self.abba)
            self.textinputs[key].bind(text=partial(self.calc, key))
            print('in init, key =', key)
            self.add_widget(self.textinputs[key])

    def abba(self, ti_instance):
        print('abba, textinput instance =', ti_instance, ', text =', ti_instance.text)

    def calc(self, key, ti_instance, text):
        print('calc:')
        print('key =', key, ', text =', text, ', textinput instance =', ti_instance)

请注意，bind to text在> 中的文本中的每一个更改都会触发。 TextInput。 on_text_validate仅在用户命中Enter时才会触发。