如何在点击python kivy中的按钮后打开弹出窗口？

Question

我试图在使用python kivy点击按钮后打开弹出窗口但是出现错误

这是我的代码：

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.popup import Popup
from kivy.config import Config


Config.set("graphics", "resizable", 0)
Config.set("graphics", "width", 400)
Config.set("graphics", "height", 500)


class myLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(myLayout, self).__init__(**kwargs)

        btn = Button(text="Click")
        btn.bind(on_press=self.clk)

        self.add_widget(btn)

    def clk(self, obj):

        popup = Popup(content="I am popup")
        return popup.open()


class ReminderApp(App):
    def build(self):
        mL = myLayout()
        return mL


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

如果在clk函数中而不是弹出只是print的东西，它可以工作，例如：

    def clk(self, obj):
    print("Hello world")

请帮帮我，我被困了

以下是错误消息：

Traceback (most recent call last):
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 619, in _apply_rule
     setattr(widget_set, key, value)
   File "kivy/weakproxy.pyx", line 33, in kivy.weakproxy.WeakProxy.__setattr__
   File "kivy/properties.pyx", line 478, in kivy.properties.Property.__set__
   File "kivy/properties.pyx", line 516, in kivy.properties.Property.set
   File "kivy/properties.pyx", line 571, in kivy.properties.Property.dispatch
   File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
   File "kivy/_event.pyx", line 1120, in kivy._event.EventObservers._dispatch
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/popup.py", line 223, in on__container
     self._container.add_widget(self.content)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/boxlayout.py", line 312, in add_widget
     widget.fbind('pos_hint', self._trigger_layout)
 AttributeError: 'str' object has no attribute 'fbind'

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "main.py", line 40, in <module>
     ReminderApp().run()
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/app.py", line 826, in run
     runTouchApp()
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/base.py", line 502, in runTouchApp
     EventLoop.window.mainloop()
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/core/window/window_sdl2.py", line 723, in mainloop
     self._mainloop()
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/core/window/window_sdl2.py", line 460, in _mainloop
     EventLoop.idle()
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/base.py", line 340, in idle
     self.dispatch_input()
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/base.py", line 325, in dispatch_input
     post_dispatch_input(*pop(0))
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/base.py", line 231, in post_dispatch_input
     listener.dispatch('on_motion', etype, me)
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/core/window/__init__.py", line 1352, in on_motion
     self.dispatch('on_touch_down', me)
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/core/window/__init__.py", line 1368, in on_touch_down
     if w.dispatch('on_touch_down', touch):
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/widget.py", line 460, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/behaviors/button.py", line 151, in on_touch_down
     self.dispatch('on_press')
   File "kivy/_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
   File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
   File "kivy/_event.pyx", line 1138, in kivy._event.EventObservers._dispatch
   File "main.py", line 25, in clk
     popup = Popup(content="I am popup")
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/modalview.py", line 152, in __init__
     super(ModalView, self).__init__(**kwargs)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/anchorlayout.py", line 68, in __init__
     super(AnchorLayout, self).__init__(**kwargs)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/layout.py", line 76, in __init__
     super(Layout, self).__init__(**kwargs)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/widget.py", line 348, in __init__
     Builder.apply(self, ignored_consts=self._kwargs_applied_init)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 469, in apply
     self._apply_rule(widget, rule, rule, ignored_consts=ignored_consts)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 630, in _apply_rule
     e), cause=tb)
 kivy.lang.builder.BuilderException: Parser: File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/data/style.kv", line 506:
 ...
     504:# Popup widget
     505:<Popup>:
 >>  506:    _container: container
     507:    GridLayout:
     508:        padding: '12dp'
 ...
 AttributeError: 'str' object has no attribute 'fbind'
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 619, in _apply_rule
     setattr(widget_set, key, value)
   File "kivy/weakproxy.pyx", line 33, in kivy.weakproxy.WeakProxy.__setattr__
   File "kivy/properties.pyx", line 478, in kivy.properties.Property.__set__
   File "kivy/properties.pyx", line 516, in kivy.properties.Property.set
   File "kivy/properties.pyx", line 571, in kivy.properties.Property.dispatch
   File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
   File "kivy/_event.pyx", line 1120, in kivy._event.EventObservers._dispatch
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/popup.py", line 223, in on__container
     self._container.add_widget(self.content)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/boxlayout.py", line 312, in add_widget
     widget.fbind('pos_hint', self._trigger_layout)

Exception ignored in: functools.partial(<function _widget_destructor at 0x102eaad08>, 23)
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/widget.py", line 265, in _widget_destructor
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 760, in unbind_widget
  File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'weakref' object has no attribute 'cline_in_traceback'
Exception ignored in: functools.partial(<function _widget_destructor at 0x102eaad08>, 34)
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/widget.py", line 265, in _widget_destructor
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 760, in unbind_widget
  File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'weakref' object has no attribute 'cline_in_traceback'
Exception ignored in: functools.partial(<function _widget_destructor at 0x102eaad08>, 39)
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/uix/widget.py", line 265, in _widget_destructor
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang/builder.py", line 760, in unbind_widget
  File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'weakref' object has no attribute 'cline_in_traceback'

Answer 1

问题

您遇到的错误是由于内容是 ObjectProperty 并分配了一个字符串，“我是弹出窗口”但它是期待一个小部件。

Popup

  

内容
标题下方显示的弹出窗口内容。
content是ObjectProperty，默认为None。

解决方案

将标签小部件添加到内容，如下所示。

片段

def clk(self, obj):

    popup = Popup(content=Label(text="I am popup"))
    popup.open()

实施例

main.py

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.popup import Popup
from kivy.config import Config


Config.set("graphics", "resizable", 0)
Config.set("graphics", "width", 400)
Config.set("graphics", "height", 500)


class myLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(myLayout, self).__init__(**kwargs)

        btn = Button(text="Click")
        btn.bind(on_press=self.clk)

        self.add_widget(btn)

    def clk(self, obj):

        popup = Popup(content=Label(text="I am popup"))
        popup.open()


class ReminderApp(App):
    def build(self):
        mL = myLayout()
        return mL


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

输出

Answer 2

弹出窗口很可能正在打开，但如果轻轻按住按钮，则弹出窗口会再次自动关闭。

尝试：

popup = Popup(content=content, auto_dismiss=False)