向kivy文件中的按钮添加功能答案

【问题标题】：Add function to button in kivy file向kivy文件中的按钮添加功能
【发布时间】：2021-11-06 14:43:57
【问题描述】：

我正在尝试将我的计算函数绑定到提交按钮。我是 Kivy 的新手，正在尝试进行一些练习。非常感谢任何学习技巧或窍门。这是我的代码：

Python 文件：

import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty

class MyGrid(Widget):
    pass
        

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

    def calculations(self):
        org_amount = float(self.ids.orgamount.text)
        org_tip = int(self.ids.orgtip.text)
        org_split = int(self.ids.split1.text)

        tip1 = org_tip/100
        tip = round(tip1 * org_amount, 2)
        total = round(tip + org_amount, 2)
        if org_split == 0:
            split = org_split
        else:
            split = round(total/org_split,2)
   


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

基维文件：

<MyGrid>:
title: 'tipBot       v1.0'
auto_dismiss: False

GridLayout:
    cols:2
    size: root.width * 0.8, root.height * 0.8
    

    row_default_height: 30
    row_force_default: True
    center: root.width/2, root.height/2

    Label:
        text: "Enter orginal bill amount: "
    TextInput:
        id: orgamount
        hint_text: 'Enter number w/ 2 decimal places'
        hint_text_color: 'blue'
        multiline:False

    Label:
        text: "How much tip will you leave: "
    TextInput:
        id: orgtip
        hint_text: 'Enter whole number'
        hint_text_color: 'blue'
        multiline:False

    Label:
        text: "How many patrons will split the bill: "
    TextInput:
        id: split1
        multiline: False

    Label:
        text: "Orignal Bill Amount: "
    TextInput:
        id: amount
        multiline: False

    Label:
        text: "Amount of tip: "
    TextInput:
        id: tip
        multiline: False

    Label:
        text: "Total with tip: "
    TextInput:
        id: withtip
        multiline: False

    Label:
        text:"Amount for each patron split: "
    TextInput:
        id:patronsplit
        multiline: False

    Button:
        id: Clear
        text: "Clear"
        size_hint_x: 0
        on_release:
            orgamount.text = ''
            orgtip.text = ''
            split1.text = ''
            amount.text = ''
            tip.text = ''
            withtip.text = ''
            patronsplit.text =''
            
    Button:
        id: Submit
        text: "Submit"
        size_hint_x:0.5
        on_press: root.calculations()
       
            enter code here

【问题讨论】：

标签： kivy kivy-language

【解决方案1】：

问题是在您的kv 中，行：

on_press: root.calculations()

正在尝试调用kv 规则的根对象的calculations() 方法，即MyGrid。解决方法是将calculations() 方法移动到MyGrid：

class MyGrid(Widget):
    def calculations(self):
        org_amount = float(self.ids.orgamount.text)
        org_tip = int(self.ids.orgtip.text)
        org_split = int(self.ids.split1.text)

        tip1 = org_tip / 100
        tip = round(tip1 * org_amount, 2)
        total = round(tip + org_amount, 2)
        if org_split == 0:
            split = org_split
        else:
            split = round(total / org_split, 2)


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

【讨论】：