Kivy中Popup弹窗无法通过按钮关闭的问题求助

问题根源 #

你代码中on_release:Factory.MyPopup().dismiss()的逻辑错误：每次调用Factory.MyPopup()都会生成一个全新的Popup实例，而不是操作当前正在显示的弹窗，因此点击按钮没有任何响应。

修复方案 #

方案1：直接修改KV语言实现关闭 #

修改<FileWidget>中的按钮事件，通过组件层级引用当前弹窗：

<FileWidget>:
    FileChooserIconView:
        id: filechooser
        dirselect: True  # 强制设置为选择文件夹模式
    Button:
        id:my_button
        text: 'Save'
        size_hint: (0.1, 0.1)
        pos_hint:{'x': 0, 'y': 0}
        on_release:
            # 打印选中的文件夹路径，可替换为你的业务逻辑
            print(root.ids.filechooser.path)
            # root是FileWidget实例，其父组件就是当前打开的MyPopup
            root.parent.dismiss()

方案2：结合Python代码实现更灵活的逻辑 #

如果需要后续处理选中的文件夹路径，推荐在Python类中封装方法：

修改后的Python代码

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.popup import Popup

class MyPopup(Popup):
    pass

class FloatLayout1(FloatLayout):
    pass

class FileWidget(FloatLayout):
    def save_and_close(self):
        # 获取用户选中的文件夹路径
        selected_folder = self.ids.filechooser.path
        # 这里可以添加路径保存、传递给主程序等逻辑
        print(f"已选择保存文件夹: {selected_folder}")
        # 关闭当前弹窗
        self.parent.dismiss()

class FloatLayout2(FloatLayout):
    def spinner_clicked(self, value):
        pass

class BoxLayout1(BoxLayout):
    pass

class BoxLayout2(BoxLayout):
    pass

class BoxLayout3(BoxLayout):
    pass

class BoxLayout4(BoxLayout):
    pass

class MyApp(App):
    def build(self):
        return BoxLayout1()

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

修改后的KV代码

#:import Factory kivy.factory.Factory

<BoxLayout3>:
    Label:
        text: "Audio:"
        halign: 'center'
        font_size:'20sp'
    CheckBox:

<BoxLayout4>:
    Label:
        text: "Video:"
        halign: 'center'
        font_size:'20sp'
    CheckBox:

<FileWidget>:
    FileChooserIconView:
        id: filechooser
        dirselect: True
    Button:
        id:my_button
        text: 'Save'
        size_hint: (0.1, 0.1)
        pos_hint:{'x': 0, 'y': 0}
        on_release: root.save_and_close()

<MyPopup>:
    auto_dismiss: False
    title: "Select a folder"
    FileWidget:

<FloatLayout1>:
    Button:
        text: 'Folder'
        on_release: Factory.MyPopup().open()
        size_hint: None, None
        size: 130, 50
        pos_hint: {'x':0.2,'y':.4}

<FloatLayout2>:
    Spinner:
        id: spinner_id
        text: "Quality"
        values: ['144p', '240p', '360p', '480p', '720p', '1080p', '1440p', '2160p']
        on_text: root.spinner_clicked(spinner_id.text)
        size_hint: None, None
        size: 130, 50
        pos_hint: {'x': .2, 'y':.4}

<BoxLayout2>:
    cols:4
    BoxLayout3:
    BoxLayout4:
    FloatLayout2:
    FloatLayout1:

<BoxLayout1>:
    orientation:'vertical'
    Label:
        text: "YouTube Downloader"
        halign: 'center'
        bold: True
        font_size:'50sp'
    TextInput:
        size_hint: (.5, .2)
        multiline: False
        hint_text: 'Enter the link of the Youtube video you want to download.'
        pos_hint: {"x": 0.25}
    BoxLayout2:
    Button:
        text: "Submit"
        size_hint: (.5, .2)
        pos_hint: {"x": 0.25}

额外优化点 #

• 给FileChooserIconView添加dirselect: True，确保用户只能选择文件夹，符合需求
• 移除了<BoxLayout1>中冗余的cols:3参数（垂直布局无需设置列数）

内容的提问来源于stack exchange，提问作者apps are the best