Question

我想将它用于以后的项目，我只想通过点击TextInput上的按钮来打印来自MainScreen的用户输入，但是当我运行并点击时带有文字的按钮＆＃34;打印文字＆＃34;没有任何错误，也没有输出。

.kv文件：

#: import FadeTransition kivy.uix.screenmanager.FadeTransition

ScreenManagement:
    transition: FadeTransition()
    MainScreen:
    SecondScreen:

<MainScreen>:
    name: "main"
    Button:
        on_release: root.get_text
        text: "Print Text"
        font_size: 50
        size_hint:0.3,0.1

    TextInput:
        text:"Hello World"
        size_hint: 0.35,0.25
        pos_hint:{"right":1, "top":1}
        color:1,0,0,1
        id: user_text

    Button:
            color: 0,1,0,1
            font_size: 25
            size_hint: 0.3,0.25
            text: "Continue"
            on_release: app.root.current = "other"
            pos_hint:{"right":1, "top":0}


<SecondScreen>:
    name: "other"
    FloatLayout:
        Button:
            color: 0,1,0,1
            font_size: 25
            size_hint: 0.3,0.25
            text: "Back Home"
            on_release: app.root.current = "main"
            pos_hint:{"right":1, "top":1}

python代码：

from kivy.app import App
#kivy.require("1.9.1")
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen , FadeTransition
from kivy.uix.widget import Widget 
from kivy.graphics import Line
from kivy.uix.textinput import TextInput

class MainScreen(Screen):
    def get_text(self,*args):
        textinput= self.ids.user_text
        user=  TextInput.text
        print(user)



class SecondScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass


gui = Builder.load_file("main.kv")


class MainApp(App):
  def build(self):
    return gui


MainApp().run()

Answer 1

当您在kv中进行编码时，您可以直接绑定，就好像您调用该函数一样。

on_release: do_this()

但你没有括号就做了，好像它是一个随意的python绑定：

self.bind(on_release=do_this)

添加括号，它应该打印：

on_release: root.get_text()

从kivy textinput

1 个答案: