如何解决当屏幕在主 .kv 文件中管理时,如何从 .py 文件切换屏幕?
我有三个代码,我对如何从我的 login.py 导航到我的 Organize.kv 中的下一个屏幕感到困惑,我有主 kv 文件,其中保存了所有屏幕以及登录 python 和 kv 文件管理登录屏幕,登录 kv 文件平衡两个不同的选项卡,到目前为止,我有创建选项卡,将您发送到连接到 mysql 的登录 python 文件的创建类,我将如何将屏幕切换到主菜单是在登录 python 文件的主 Organize.kv 文件中吗?对不起,如果这没有意义,我非常警告不要试图解决这个问题。
有什么帮助,谢谢
包含所有屏幕的主 Organize.kv
#:import organize organize
#:import navigation_screen_manager navigation_screen_manager
#:import anchorlayout_with_action_bar anchorlayout_with_action_bar
#:import sharpen_skills sharpen_skills
#:import login login
<MainMenu@BoxLayout>:
orientation: "vertical"
padding: "40dp"
spacing: "20dp"
size_hint: .7,.9
pos_hint: {"center_x": .5}
Button:
text: "Organize"
on_press: app.manager.push("screen2")
Button:
text: "Journal"
on_press: app.manager.push("screen3")
Button:
text: "Sharpen Skills"
on_press: app.manager.push("SkillsExamplesTabs")
Button:
text: "Exit"
on_press: app.stop()
<MyScreenManager>:
Screen:
name: "Login"
title: "login"
LoginTabs:
Screen:
name: "MainMenu"
MainMenu:
Screen:
name: "screen2"
AnchorLayoutWithActionBar:
title: "Organize"
Screen:
name: "screen3"
AnchorLayoutWithActionBar:
title: "Journal"
Screen:
name: "SkillsExamplesTabs"
AnchorLayoutWithActionBar:
title: "Sharpen Skills"
SkillsExamplesTabs:
我的 login.kv 文件
<LoginTabs@TabbedPanel>:
do_default_tab: False
TabbedPanelItem:
text: "Create Account"
Create:
TabbedPanelItem:
text: "Login"
Login:
最后是我的 login.py 文件
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager
from kivy.uix.stacklayout import StackLayout
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.graphics import Color,Rectangle
import mysql.connector
import navigation_screen_manager
from kivy.uix.screenmanager import ScreenManager,Screen
from navigation_screen_manager import NavigationScreenManager
Builder.load_file("login.kv")
Builder.load_file("Organize.kv")
sm = ScreenManager()
class MyScreenManager(NavigationScreenManager):
pass
class Create(BoxLayout):
def __init__(self,**kwargs):
super().__init__(**kwargs)
self.orientation = "vertical"
self.build()
def build(self):
self.warning = Label(text="",pos_hint={'center_x': .5,'center_y': .5})
user_label = Label(text="Username",size_hint=(.5,.5),'center_y': .5})
self.user_textinput = TextInput(text='Enter Username')
pas_label = Label(text="Password",'center_y': .5})
self.pas_textinput = TextInput(text="enter Password")
enter_button = Button(text="Create")
with user_label.canvas:
Color(0,.25,1,.25)
enter_button.bind(on_press=self.Add)
self.add_widget(self.warning)
self.add_widget(user_label)
self.add_widget(self.user_textinput)
self.add_widget(pas_label)
self.add_widget(self.pas_textinput)
self.add_widget(enter_button)
def Add(self,btn):
print("Working")
t1 = self.user_textinput.text
t2 = self.pas_textinput.text
print(f"T1 = {t1} and {t2}")
conn = mysql.connector.connect(
user='root',password='*******',host='127.0.0.1',database='Usersdb')
mycursor = conn.cursor()
try:
sql = "INSERT INTO user_info (user_name,user_pass) VALUES (%s,%s)"
val = (t1,t2)
mycursor.execute(sql,val)
conn.commit()
except:
self.warning = "Username Already Taken"
class Login(StackLayout):
pass
最后是我的应用类
from kivy.app import App
from kivy.uix.label import Label
from kivy.metrics import dp
from kivy.properties import StringProperty,BooleanProperty,ObjectProperty
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.uix.popup import Popup
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.stacklayout import StackLayout
from kivy.uix.widget import Widget
from navigation_screen_manager import NavigationScreenManager
class MyScreenManager(NavigationScreenManager):
pass
class Organizer(App):
manager = ObjectProperty(None)
def build(self):
self.manager = MyScreenManager()
return self.manager
Organizer().run()
还有我的导航屏幕管理器
from kivy.uix.screenmanager import ScreenManager
class NavigationScreenManager(ScreenManager):
screen_stack = []
def push(self,screen_name):
self.screen_stack.append(self.current)
self.transition.direction = "left"
self.current = screen_name
def pop(self):
if len(self.screen_stack) > 0:
screen_name = self.screen_stack[-1]
del self.screen_stack[-1]
self.transition.direction = "right"
self.current = screen_name
解决方法
您的帖子不包括您的 App
课程,因此无法给出具体答案。一旦加载了这些 kv
文件,您拥有多个 kv
文件的事实就无关紧要了。通常,您只需将 current
的 ScreenManager
属性设置为您想要显示的 name
的 Screen
。
同样,一旦加载了这些 kv
文件,您拥有多个 kv
文件的事实就无关紧要了。因此,在任何 kv
文件中,我相信您应该能够使用:
app.manager.push("MainMenu")
或:
app.manager.current = "MainMenu"
前往MainMenu
Screen
。
美好的一天。您必须访问您的屏幕管理器才能设置当前屏幕,即您的活动屏幕。在您的 App
类中,我建议您通过 on_start
函数将您的屏幕管理器保存为一个属性。
class MyApp(App):
def on_start(self):
screen_manager = self.root
从那里,您可以使用 kivy 或 python 中的回调方法设置当前屏幕。
#in kv
on_release: setattr(app.screen_manager,'current','the next screen name')
#in python
def set_screen_callback(self,instance *args):
app.screen_manager.current = "the next screen name"
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