問題描述

我的第一個屏幕上有一個 TextInput，我想在第二個屏幕的標(biāo)簽中使用接收到的文本.我怎樣才能做到這一點(diǎn)?由于可以有不同的玩家，我創(chuàng)建了一個類 Players ，它為每個玩家存儲一個名字和他/她的分?jǐn)?shù).在第二個屏幕中，我還嘗試創(chuàng)建一個可以編輯點(diǎn)(標(biāo)簽文本)的按鈕，但是當(dāng)我單擊它時，什么也沒有發(fā)生.(我也是新手.)

I have a TextInput on my first screen and I want to use the received text in a Label on my second screen. How can I do this? Since there can be different players, I created a class Players which stores for every player a name and his/her points. In the second screen, I also tried to create a button which can edit the points (text of Label), but when I click it, nothing happens. (I am also new to classes.)

在下面的代碼中，我標(biāo)記了相關(guān)的行.

In the code below, I marked the relevant lines.

所以概述:

• 第一個屏幕:使用 textInput 提取用戶名 + 使用 Player 類創(chuàng)建播放器實(shí)例

• First screen: extract user name(s) with textInput + create player instances with Player class

第二個屏幕:在標(biāo)簽中使用玩家名稱 + 在標(biāo)簽中使用玩家點(diǎn) + 創(chuàng)建 2 個按鈕，從這個點(diǎn)"標(biāo)簽中添加/減去點(diǎn)

Second screen: Use player name in a Label + use player points in Label + create 2 Buttons that add/subtract points from this 'point' Label

我知道這里有類似的情況，但它對我的 .py 文件沒有幫助:如何在 Kivy/Python 的另一個屏幕中引用 TextInput?

I know there is a similar case here, but it doesn't help me for my .py file: How to ref a TextInput from one screen in another screen in Kivy/Python?

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.textinput import TextInput
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.properties import ObjectProperty, NumericProperty


class Player:
    def __init__(self, name):
        self.name = name
        self.points = 0

    def reset_points(self):
        self.points = 0

    def add_point(self, *args):
        self.points += 1

    def subtract_point(self, *args):
        self.points -= 1


class WelcomeWindow(Screen):
    # Introduce names of the 4 players

    def __init__(self, **kwargs):
        super(WelcomeWindow, self).__init__(**kwargs)
        self.name = "welcomewindow"
        self.layout = "layout_welcome_window"

        global_layout = GridLayout(rows=3)
        self.add_widget(global_layout)

        label_player_i = Label(text="Name Player ")
        global_layout.add_widget(label_player_i)

        name_input_player_i = TextInput(id="player ", text="player", multiline=False) # <--- user inputs name here
        global_layout.add_widget(name_input_player_i)

        self.player1 = Player(name_input_player_i.text) # <--- name is assigned to player here

        # Create button to go to next screen
        go_further_button = Button(text="Go to first round")
        go_further_button.bind(on_release=self.go_further)
        global_layout.add_widget(go_further_button)

    def go_further(self, *args):
        self.manager.current = "firstround"
        self.manager.transition.direction = "left"

class FirstRound(Screen):
    #Give explanation of first round + option to add points for every player

    def __init__(self, **kwargs):
        super(FirstRound, self).__init__(**kwargs)
        self.name = "firstround"
        self.layout = "layout_first_round"

        #Create layout
        global_layout = GridLayout(rows=4)
        self.add_widget(global_layout)

        #Create Labels
        label_player_name_i = Label(text=WelcomeWindow().player1.name) # <--- Label should get the name of the player here
        global_layout.add_widget(label_player_name_i)

        label_player_points_i = Label(text=str(WelcomeWindow().player1.points)) # <--- Label should get points of player
        global_layout.add_widget((label_player_points_i))

        #Create Buttons
        button_minus = Button(text="-", font_size=100, id="minus_button")
        button_minus.bind(on_release=WelcomeWindow().player1.subtract_point) # <--- When button pushed: should subtract point
        global_layout.add_widget(button_minus)

        button_plus = Button(text="+", font_size=100, id="plus_button")
        button_plus.bind(on_release=WelcomeWindow().player1.add_point) # <--- When button pushed: should add point
        global_layout.add_widget(button_plus)


WindowManager = ScreenManager()
WindowManager.add_widget(WelcomeWindow())
WindowManager.add_widget(FirstRound())

class KingenApp(App):

    def build(self):
        return WindowManager

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

推薦答案

你的代碼有幾個問題:

• 當(dāng)您創(chuàng)建該 Widget 的實(shí)例時，將調(diào)用任何 Widget 的 __init__() 方法.所以 FirstRound 的 __init__() 方法在 WindowManager.add_widget(FirstRound()) 行被調(diào)用.那個時候，WelcomeWindow的TextInput是不能輸入文字的，因此您無法獲得當(dāng)時的玩家名稱.
• Player 實(shí)例的創(chuàng)建 (self.player1 = Player(name_input_player_i.text)) 在用戶創(chuàng)建 Player 實(shí)例之前有機(jī)會輸入玩家姓名.
• 在FirstRound的__init__()方法中使用WelcomeWindow()會創(chuàng)建一個新的WelcomeWindow 與您的 GUI 中的那個無關(guān).所以從那個實(shí)例中提取的任何信息都是沒有用的.
• 在您的 FirstRound 中，玩家點(diǎn)標(biāo)簽在創(chuàng)建 Label 時從 Player 類實(shí)例獲取其數(shù)據(jù).之后更改 Player 的 points 屬性將不會影響 Label.

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.textinput import TextInput
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.label import Label


class Player:
    def __init__(self, name):
        self.name = name
        self.points = 0

    def reset_points(self):
        self.points = 0

    def add_point(self, *args):
        self.points += 1

    def subtract_point(self, *args):
        self.points -= 1


class WelcomeWindow(Screen):
    # Introduce names of the 4 players

    def __init__(self, **kwargs):
        super(WelcomeWindow, self).__init__(**kwargs)
        self.name = "welcomewindow"
        self.layout = "layout_welcome_window"

        global_layout = GridLayout(rows=3)
        self.add_widget(global_layout)

        label_player_i = Label(text="Name Player ")
        global_layout.add_widget(label_player_i)

        self.name_input_player_i = TextInput(id="player ", text="player", multiline=False) # <--- user inputs name here
        global_layout.add_widget(self.name_input_player_i)

        # Create button to go to next screen
        go_further_button = Button(text="Go to first round")
        go_further_button.bind(on_release=self.go_further)
        global_layout.add_widget(go_further_button)

    def go_further(self, *args):
        self.player1 = Player(self.name_input_player_i.text) # <--- name is assigned to player here
        self.manager.current = "firstround"
        self.manager.transition.direction = "left"


class FirstRound(Screen):
    #Give explanation of first round + option to add points for every player

    def __init__(self, **kwargs):
        super(FirstRound, self).__init__(**kwargs)
        self.name = "firstround"
        self.layout = "layout_first_round"

    def on_enter(self, *args):
        #Create layout
        global_layout = GridLayout(rows=4)
        self.add_widget(global_layout)

        #Create Labels
        welcome_window = self.manager.get_screen('welcomewindow')  # get a reference to the WelcomeWindow instance
        label_player_name_i = Label(text=welcome_window.player1.name) # <--- Label should get the name of the player here
        global_layout.add_widget(label_player_name_i)

        label_player_points_i = Label(text=str(welcome_window.player1.points)) # <--- Label should get points of player
        global_layout.add_widget((label_player_points_i))

        #Create Buttons
        button_minus = Button(text="-", font_size=100, id="minus_button")
        button_minus.bind(on_release=welcome_window.player1.subtract_point) # <--- When button pushed: should subtract point
        global_layout.add_widget(button_minus)

        button_plus = Button(text="+", font_size=100, id="plus_button")
        button_plus.bind(on_release=welcome_window.player1.add_point) # <--- When button pushed: should add point
        global_layout.add_widget(button_plus)


WindowManager = ScreenManager()
WindowManager.add_widget(WelcomeWindow())
WindowManager.add_widget(FirstRound())


class KingenApp(App):

    def build(self):
        return WindowManager


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