Kivy中屏幕外文本输入的清晰度

Question

我试图清除textinput中的文本，但在访问texinput属性时遇到问题。我想清除文本(entry.text)后，当我释放按钮接受并离开InputScreen。我找到了get_screen()来设置属性，但我现在不知道如何将它与kivy-language一起使用

ScreenManagement:
    id: screen_manager
    transition: FadeTransition()
    MainScreen:
        id: main_screen
        name: "main"
        manager: screen_manager
        numberSet1: input_screen.number1
        numberSet2: input_screen.number2
        numberSet3: input_screen.number3
    InputScreen:
        id: input_screen
        name: "input"
        manager: screen_manager
        textIdToReturn: main_screen.textName

<InputScreen>:

    NawiButton:
        tempNumber: key_board.entryText
        pos: root.width - 100 - 0.25 * root.width, 10
        text: "Acceppt"
        on_release: root.saveValue(root.textIdToReturn, self.tempNumber)
        background_normal: ''
        background_color: .3, 1, .4, .85

    KeyBoardGridLayout:
        id: key_board
        name: "KeyBoard"

<KeyBoardGridLayout>:
    rows: 5
    padding: [100, 10, 100, 100]
    spacing: 3
    entryText: entry.text

    BoxLayout:
        TextInput:
            id: entry
            font_size: 45
            multiline: False
            on_text: root.update_padding(args[0])
            padding_x: self.width/2


    BoxLayout:
        spacing: 3
        KeyBoardButton:
            text: "1"
            on_press: entry.text = root.addText(entry.text, self.text)
        KeyBoardButton:
            text: "2"
            on_press: entry.text = root.addText(entry.text, self.text)
        KeyBoardButton:
            text: "3"
            on_press: entry.text = root.addText(entry.text, self.text)

MainScreen类，但我认为这并不重要：

<MainScreen>:
        BoxLayout:
            orientation: "vertical"
            spacing: 50
            padding: [300, 50, 300, 50]

            Button:
                text: root.numberSet1
                id: textNum1
                name: textNum1
                font_size: 45
                on_release:
                    root.touch("textNum1")

Answer 1

在kv文件中，使用on_leave或InputScreen:处的on_pre_leave事件清除文本(entry.text)。

Screen Manage » API » Events

事件：

on_pre_leave：()

当屏幕即将被移除时触发的事件:开始离开动画。

on_leave：()

当屏幕被移除时触发的事件:离开动画完成。

代码片段

ScreenManagement:
    id: screen_manager
    transition: FadeTransition()
    MainScreen:
        id: main_screen
        name: "main"
        manager: screen_manager
        numberSet1: input_screen.number1
        numberSet2: input_screen.number2
        numberSet3: input_screen.number3
    InputScreen:
        id: input_screen
        name: "input"
        manager: screen_manager
        textIdToReturn: main_screen.textName

        on_leave:
            root.ids.input_screen.key_board.ids.entry.text = ''
...

<InputScreen>:
    key_board: key_board

备注

kv文件- ObjectProperty和ids

key_board: key_board

指示名为key_board的ObjectProperty正指向(挂钩)KeyBoardGridLayout的id key_board。

entry

它是一个id，也是对TextInput小部件弱引用。

entry.text

它引用了TextInput的文本的值。

entryText: entry.text

entryText是KeyBoardGridLayout的属性。如果小部件没有具有给定名称的属性，将自动创建一个ObjectProperty并将其添加到小部件中。将entry.text的值赋给entryText