我一直在与kivymd合作开发移动应用程序。但是我在MDFloatingActionButtonSpeedDial上遇到问题。我想将MDFloatingActionButtonSpeedDial中的锚点值设置为某些按钮“ 左”，并将某些按钮设置为“ 右”。因此，我修改了模块“ kivymd.uix.button ”中的 MDFloatingActionButtonSpeedDial 类，并在“ anchor ”中添加了更多选项假定为OptionProperty。同时，我还添加了应用更改所需的方法。 acnhor中的更改为：-
anchor = OptionProperty('right',option=["right","left"])
方法的变化是：-
def set_pos_labels(self, widget):
"""Sets the position of the floating labels."""
if self.anchor == "right":
widget.x = Window.width - widget.width - dp(86)
elif self.anchor == "left":
widget.x = widget.width + dp(86)
def set_pos_root_button(self, instance):
"""Sets the position of the root button."""
if self.anchor == "right":
instance.y = dp(20)
instance.x = Window.width - (dp(56) + dp(20))
elif self.anchor == "left":
instance.y = dp(20)
instance.x = (dp(56) + dp(20))
def set_pos_bottom_buttons(self, instance):
"""Sets the position of the bottom buttons in a stack."""
if self.anchor == "right":
if self.state != "open":
instance.y = instance.height / 2
instance.x = Window.width - (instance.height + instance.width / 2)
elif self.anchor == "left":
if self.state != "open":
instance.y = instance.height / 2
instance.x = (instance.height + instance.width / 2)
我添加了left anchor属性，因为默认情况下显示了right anchor。
我编写的Builder字符串如下：-
MDFloatingActionButtonSpeedDial:
data : app.data_download
rotation_root_button : True
id : download_button
icon: 'download'
anchor: 'left'
MDFloatingActionButtonSpeedDial:
data : app.data_return
rotation_root_button: True
icon : 'arrow-left'
anchor: 'right'
现在，每当我尝试将构建器字符串文件中的锚属性设置为默认选项（右）以外的“左”时，程序都会返回错误。我想通知是否将锚的默认值设置为left，然后将锚设置为右的错误，当将锚的默认值设置为right时，将锚的默认值设置为左的错误。我得到的错误是：-
Traceback (most recent call last):
File "C:\Users\user\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 700, in _apply_rule
setattr(widget_set, key, value)
File "kivy\weakproxy.pyx", line 35, in kivy.weakproxy.WeakProxy.__setattr__
File "kivy\properties.pyx", line 497, in kivy.properties.Property.__set__
File "kivy\properties.pyx", line 541, in kivy.properties.Property.set
File "kivy\properties.pyx", line 532, in kivy.properties.Property.set
File "kivy\properties.pyx", line 1252, in kivy.properties.OptionProperty.check
ValueError: MDFloatingActionButtonSpeedDial.anchor is set to an invalid option 'left'. Must be one
of: []
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "onlinecv2.py", line 500, in <module>
ScanIt().run()
File "C:\Users\user\Anaconda3\lib\site-packages\kivy\app.py", line 829, in run
root = self.build()
File "onlinecv2.py", line 435, in build
camerascreen = Builder.load_string(screen_helper)
File "C:\Users\user\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 405, in load_string
rule_children=rule_children)
File "C:\Users\user\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 707, in _apply_rule
e), cause=tb)
kivy.lang.builder.BuilderException: Parser: File "<inline>", line 154:
...
152: id : download_button
153: icon: 'download'
>> 154: anchor: 'left'
155:
156:
...
ValueError: MDFloatingActionButtonSpeedDial.anchor is set to an invalid option 'left'. Must be one
of: []
File "C:\Users\user\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 700, in _apply_rule
setattr(widget_set, key, value)
File "kivy\weakproxy.pyx", line 35, in kivy.weakproxy.WeakProxy.__setattr__
File "kivy\properties.pyx", line 497, in kivy.properties.Property.__set__
File "kivy\properties.pyx", line 541, in kivy.properties.Property.set
File "kivy\properties.pyx", line 532, in kivy.properties.Property.set
File "kivy\properties.pyx", line 1252, in kivy.properties.OptionProperty.check
当我在kivy文件中未设置任何锚点值时，我得到的输出（这是不希望的）是： I only get the floating button in the right. But the output that I desire is I wanted two floating buttons to be present on both side of the screen i.e. left as well as right. But I am getting only on one side and so i started to change the module but ended up with an error.
因此，如果您能为我提供解决此错误的解决方案，以便同时使用锚属性“ left”和“ right”，我将感到很高兴。
