Class 方法在 Kivy 中调用时不会运行

Question

我是kivy的新手。我创建了一个包含 2 个文本字段的登录页面。我现在正尝试将变量传递到下一页，它将使用 python 的 ssh 客户端连接到服务器。但是，当我运行程序时，似乎我在第二个屏幕中调用的方法甚至没有运行，因为调试输出显示 none。

我尝试了几种将变量传递给不同 class 的函数的方法，暂时我决定使用全局变量。我确信有更简单或更好的方法，但我无法首先获得运行的功能。

main.py

from kivy.config import Config
Config.set('graphics', 'resizable', False)

from kivy.app import App

from kivy.properties import StringProperty

from kivy.core.window import Window

from kivy.uix.screenmanager import ScreenManager, Screen, SlideTransition

import csv
import paramiko
#import os

global username
global password

def load_csv(filepath):
    with open(filepath, newline='') as csvfile:
        file_array = list(csv.reader(csvfile))
        csvfile.close()
    return file_array

class Connect(Screen):
    Window.size = (600, 300)
    def routine(self):

        host = 'titanrobotics.ddns.net'
        port = 60022
        print(username, password)
        self.ids.status.text = "connecting"

        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

        try:
            self.ids.status.text = "attempting to connect to " + host
            ssh.connect(host, port, username, password)
            yield ssh
            self.ids.status.text = "connected to " + host

        finally:
            ssh.close()
            self.ids.status.text = "connection failed"

        #print("here")
    #ssh = loginroutine(username, password)

class Login(Screen):
    Window.size = (600, 300)
    def do_login(self, loginText, passwordText):
        app = App.get_running_app()

        username = loginText
        password = passwordText

        self.manager.transition = SlideTransition(direction = "left")
        self.manager.current = "connect"

    def resetForm(self):
        self.ids['login'].text = ""
        self.ids['password'].text = ""

class BrummetApp(App):
    username = StringProperty(None)
    password = StringProperty(None)

    title = 'Brummet Client v ' + load_csv("data/meta")[0][1]

    def build(self):
        manager = ScreenManager()

        manager.add_widget(Login(name = 'login'))
        manager.add_widget(Connect(name = 'connect'))

        return manager

if __name__ == '__main__':
    BrummetApp().run()

brummet.kv

<Login>:
    BoxLayout
        id: login_layout
        orientation: 'vertical'
        padding: [10,10,10,10]
        spacing: 10

        BoxLayout:
            orientation:'vertical'
            padding: [0,0,0,0]
            spacing: 0

            Label:
                id: title
                text: 'Brummet Client'
                halign: 'center'
                valign: 'middle'
                font_size: 24

            Label:
                text: 'Please log in with IMSA SLURM credentials'
                halign: 'center'
                valign: 'middle'
                spacing: -20
                font_size: 24

        BoxLayout:
            orientation: 'vertical'

            Label:
                text: 'Username'
                font_size: 18
                halign: 'left'
                text_size: root.width-20, 0

            TextInput:
                id: username
                multiline: False
                font_size: 16
                write_tab: False

        BoxLayout:
            orientation: 'vertical'
            Label:
                text: 'Password'
                halign: 'left'
                font_size: 18
                text_size: root.width-20, 0

            TextInput:
                id: password
                multiline: False
                password: True
                font_size: 16
                write_tab: False

        Button:
            text: 'Log In'
            font_size: 24

            on_press:
                root.do_login(username.text, password.text)

<Connect>:
    on_enter:
        root.routine()
    BoxLayout:
        orientation: 'vertical'
        padding: [0,125,0,125]
        spacing: 0

        Label:
            text:'Logging In'
            font_size: 24
            halign: 'center'
            valign: 'middle'

        Label:
            id: status
            test:''
            font_size: 16
            halign: 'center'
            valign: 'middle'

似乎加载 Connect class 没问题，但是我无法运行 .routine() 方法 on_enter。

Answer 1

yield ssh 正在阻止 Connect.routine() 执行。尝试将其注释掉。

Class 方法在 Kivy 中调用时不会运行

Class method does not run when called upon in Kivy

python-3.x

kivy

kivy-language

Class 方法在 Kivy 中调用时不会 运行

Class method does not run when called upon in Kivy

python-3.x

kivy

kivy-language

Class 方法在 Kivy 中调用时不会运行