The image that represents the background appearance of the text field when it is enabled.
- iOS 2.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
When set, the image referred to by this property replaces the standard appearance controlled by the
border property. Background images are drawn in the border rectangle portion of the text field. Images you use for the text field’s background should be able to stretch to fit.
This property is set to
nil by default.