setBackgroundImage(_:for:style:barMetrics:)
Sets the background image for the specified state, style, and metrics.
Declaration
func setBackgroundImage(_ backgroundImage: UIImage?, for state: UIControl.State, style: UIBarButtonItem.Style, barMetrics: UIBarMetrics)Parameters
- backgroundImage:
The background image to use for the specified state, style, and metrics.
- state:
The bar button state.
- style:
The bar button style.
- barMetrics:
The bar button metrics.
Discussion
For good results, backgroundImage must be a stretchable image.