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[英]How to change a Label text on another screen by pressing a Button Python Kivy
[英]Update label's text when pressing a button in Kivy for Python
這是我的代碼:我想制作一個游戲,當你按下一個按鈕時,main_label會改變文本,但我已經到處看了一周,但仍然不明白該怎么做。 我查看了Kivy的網站,但我不明白。 正如你所看到的,我是新來的kivy而且不是很有經驗
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?
謝謝您的幫助。
好! 您的代碼確實需要改進。 (我理解你,因為你沒有經驗。)
改進:1
如果你在build()上返回一個小部件,或者你設置了self.root,就可以構建一個應用程序。(你不應該在構建函數本身中創建所有gui。)
def build(self):
return Hello() #That's what is done here
改進:2
on_release / on_press都很有用。
self.help_button = Button(text = "Help", size_hint=(.3, .1),pos_hint={'x':.65, 'y':.1},on_press = self.update)
改進:3
當按下help_button時,調用更新函數來更改main_label的文本。
def update(self,event):
self.main_label.text = "Changed to change"
這是你完整改進的代碼
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()
另外一種方法是,在Kivy中,kivy語言屬性右側的所有東西都是純粹的python。 因此,您可以通過將一些標記傳遞給您的函數將您的kivy文件連接到python,然后根據需要在python中執行操作。
在.kv文件中:
Button:
on_press: root.label_change('btn1')
在Python文件中:
Class MyButton(Button):
def label_change(self, event):
self.event = event
if self.event == "btn1":
label.text = "something"
小臟片!
import kivy
kivy.require('1.9.1')
from kivy.app import App
from kivy.lang import Builder
from kivy.clock import Clock
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
import random,string
Builder.load_string('''
<updlbl>:
orientation: 'vertical'
Label:
id: updlbl
text: 'Update Label'
Button:
text: 'Click me'
on_press: root.upd('updated text')
''')
class updlbl(BoxLayout):
def __init__(self, **kwargs):
super(updlbl,self).__init__(**kwargs)
pass
def upd(self,txt):
self.ids.updlbl.text = txt
class UpdateLabel(App):
def build(self):
self.title = "Update Label"
return updlbl()
if __name__ == '__main__':
UpdateLabel().run()
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