Note that by using this API, you take full responsibility for setting
up the proper accessibility label and description information for @button.
Most likely, you'll either set the accessibility label or description
for @button explicitly, or you'll set a labelled-by or described-by
relations from @child to @button.
Sets the child widget of @button.
Note that by using this API, you take full responsibility for setting up the proper accessibility label and description information for @button. Most likely, you'll either set the accessibility label or description for @button explicitly, or you'll set a labelled-by or described-by relations from @child to @button.