setValue
Sets @key in @settings to @value.
It is a programmer error to give a @key that isn't contained in the schema for @settings or for @value to have the incorrect type, per the schema.
If @value is floating then this function consumes the reference.
Return
true if setting the key succeeded, false if the key was not writable
Since
2.26
Parameters
key
the name of the key to set
value
a #GVariant of the correct type