python 脚本为运行时如何在 kivy 中显示文本或弹出窗口

Question

大家好阅读这个话题。

我想做的是：在 if 语句中匹配值后自动在 Label 中显示文本。第二个选项可以是 Popup insted Label。第三种方式可以跳转到不同的屏幕。

请帮帮我，我真的不知道如何在不使用任何按钮的情况下将它与 kivy 连接起来。以下是代码：

python:

from kivy.app import App
import random
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen

class Main(ScreenManager):
    pass

class Numbers(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)


    def process(self):

        num_list = ['four','three']
        number = random.choice(num_list)
        self.number.text = number
        print(number)
        while True:

            if number == 'null':
                pass
            elif number == 'three':
                pass
            elif number == 'four':
                self.root.ids.numb.text="four"
                print(' for example Here i need connect code with kivy to display on screen text as string or jump to another screen')
                break
            else:
                pass
kv = Builder.load_file('temp.kv')


class NumbersApp(App):
    def build(self):
        return kv

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

和kv文件：

Main:
    Numbers:
<Numbers>:
    number:numb
    cols:1
    RelativeLayout:
        Label:
            id: numb
            text: 'Text display after getting \ninfo from script in while loop \nin process def'
            font_size: '15'
            hint_size: None, None
            pos_hint: {'x': 0.04, 'y': -0.4}
            color: 1,1,1,1

Answer 1

你的线路：

self.root.ids.numb.text="four"

不正确，因为 numb id 在 Numbers 对象中，但您正试图访问 Numbers 对象的 root 属性.只需将该行更改为：

self.ids.numb.text = "four"

访问正确的ids。

所以这里是您的 kv 的修改版本，其中包含一个 Button 以开始 process()

Main:
    Numbers:
<Numbers>:
    number:numb
    cols:1
    RelativeLayout:
        Label:
            id: numb
            text: 'Text display after getting \ninfo from script in while loop \nin process def'
            font_size: '15'
            hint_size: None, None
            pos_hint: {'x': 0.04, 'y': -0.4}
            color: 1,1,1,1
        Button:
            text: 'Start Process'
            size_hint: None, None
            size: self.texture_size
            pos_hint: {'center_x': 0.5, 'top': 1}
            on_release: root.start_process()

这是您的 Numbers class 的修改版本，它使用另一个 Thread 和 Clock.schedule_once():

class Numbers(Screen):
    def start_process(self):
        # run process() on another thread
        threading.Thread(target=self.process, daemon=True).start()

    def process(self):
        print('process')
        num_list = ['four','three']
        number = random.choice(num_list)
        print(number)
        while True:

            if number == 'null':
                pass
            elif number == 'three':
                pass
            elif number == 'four':
                print(' for example Here i need connect code with kivy to display on screen text as string or jump to another screen')
                Clock.schedule_once(self.set_text)  # set text on the main thread
                break
            else:
                pass

    def set_text(self, dt):
        self.ids.numb.text = "four"

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