問題描述

這是我的代碼:我想制作一個游戲，當您按下按鈕時，main_label 會更改文本，但我已經到處看了一個星期，但仍然不明白該怎么做.我查看了 Kivy 的網站，但我不明白.如您所見，我是 kivy 新手，經驗不足

Here is my code: I want to make a game where the main_label changes text when you press a button but I've looked everywhere for a week and still don't understand how to do it. I looked on Kivy's website but I don't understand. As you can see I'm new to kivy and not very experienced

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.clock import Clock

energy = 100
hours = 4

class app1(App):
    def build(self):
        self.f = FloatLayout()

        #Labels
        self.energy_label = Label(text = "Energy = " + str(energy), size_hint=(.1, .15),pos_hint={'x':.05, 'y':.9})
        self.time_label = Label(text = "Hours = " + str(hours), size_hint=(.1, .15),pos_hint={'x':.9, 'y':.9})
        self.name_label = Label(text = "Game", size_hint=(.1, .15),pos_hint={'x':.45, 'y':.9})
        self.main_label = Label(text = "Default_text", size_hint=(1, .55),pos_hint={'x':0, 'y':.35})

        #Main Buttons
        self.inventory_button = Button(text = "Inventory", size_hint=(.3, .1),pos_hint={'x':.65, 'y':.2})
        self.help_button = Button(text = "Help", size_hint=(.3, .1),pos_hint={'x':.65, 'y':.1})
        self.craft_button = Button(text = "Craft", size_hint=(.3, .1),pos_hint={'x':.05, 'y':.1})
        self.food_button = Button(text = "Food", size_hint=(.3, .1),pos_hint={'x':.35, 'y':.2})
        self.go_button = Button(text = "Go", size_hint=(.3, .1),pos_hint={'x':.35, 'y':.1})
        self.walk_button = Button(text = "Walk", size_hint=(.3, .1),pos_hint={'x':.05, 'y':.2})

        def update(self, *args):
            self.main_widget.text = str(self.current_text)

        self.f.add_widget(self.energy_label)
        self.f.add_widget(self.main_label)
        self.f.add_widget(self.time_label)
        self.f.add_widget(self.inventory_button)
        self.f.add_widget(self.help_button)
        self.f.add_widget(self.craft_button)
        self.f.add_widget(self.food_button)
        self.f.add_widget(self.go_button)
        self.f.add_widget(self.walk_button)
        self.f.add_widget(self.name_label)
        self.current_text = "Default"
        Clock.schedule_interval(update, 1)
        return self.f


        def update_label(input):
            input = self.current_text

        help_button.bind(on_press = update_label("success!"))


if __name__=="__main__":
    app1().run()

如何更新我的代碼，以便通過按下 help_button，main_label 更改其文本?

感謝您的幫助.

推薦答案

好吧！您的代碼確實需要改進.(我理解你沒有經驗.)

Well! there was a real need for improvement in your code. (I understand it as you are not experienced.)

改進:1

如果您在 build() 上返回一個小部件，或者您設置self.root.(你不應該在構建函數本身中制作所有的 gui.)

An application can be built if you return a widget on build(), or if you set self.root.(You shouldn't make all of the gui in build function itself.)

def build(self):
    return Hello() #That's what is done here

改進:2

on_release/on_press 兩者總是有用的.

on_release/on_press both are always useful.

self.help_button = Button(text = "Help", size_hint=(.3, .1),pos_hint={'x':.65, 'y':.1},on_press = self.update)

改進:3

當 help_button 被按下時，更新函數被調用來改變 main_label 的文本.

As help_button is pressed, update function is called which changes the text of main_label.

def update(self,event):
    self.main_label.text = "Changed to change"

這是完整改進的代碼

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.floatlayout import FloatLayout
from kivy.clock import Clock

energy = 100
hours = 4

class Hello(FloatLayout):
    def __init__(self,**kwargs):
        super(Hello,self).__init__(**kwargs)

        self.energy_label = Label(text = "Energy = " + str(energy), size_hint=(.1, .15),pos_hint={'x':.05, 'y':.9})
        self.time_label = Label(text = "Hours = " + str(hours), size_hint=(.1, .15),pos_hint={'x':.9, 'y':.9})
        self.name_label = Label(text = "Game", size_hint=(.1, .15),pos_hint={'x':.45, 'y':.9})
        self.main_label = Label(text = "Default_text", size_hint=(1, .55),pos_hint={'x':0, 'y':.35})

    #Main Buttons
        self.inventory_button = Button(text = "Inventory", size_hint=(.3, .1),pos_hint={'x':.65, 'y':.2})
        self.help_button = Button(text = "Help", size_hint=(.3, .1),pos_hint={'x':.65, 'y':.1},on_press = self.update)
        self.craft_button = Button(text = "Craft", size_hint=(.3, .1),pos_hint={'x':.05, 'y':.1})
        self.food_button = Button(text = "Food", size_hint=(.3, .1),pos_hint={'x':.35, 'y':.2})
        self.go_button = Button(text = "Go", size_hint=(.3, .1),pos_hint={'x':.35, 'y':.1})
        self.walk_button = Button(text = "Walk", size_hint=(.3, .1),pos_hint={'x':.05, 'y':.2})

        self.add_widget(self.energy_label)
        self.add_widget(self.main_label)
        self.add_widget(self.time_label)
        self.add_widget(self.inventory_button)
        self.add_widget(self.help_button)
        self.add_widget(self.craft_button)
        self.add_widget(self.food_button)
        self.add_widget(self.go_button)
        self.add_widget(self.walk_button)
        self.add_widget(self.name_label)
        self.current_text = "Default"

    def update(self,event):
        self.main_label.text = "Changed to change"

class app1(App):
    def build(self):
        return Hello()
if __name__=="__main__":
     app1().run()

這篇關于在 Kivy for Python 中按下按鈕時更新標簽的文本的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！