resolvedColor(with:)
Returns the version of the current color that results from the specified traits.
Declaration
func resolvedColor(with traitCollection: UITraitCollection) -> UIColorParameters
- traitCollection:
The traits to use when resolving the color information.
Return Value
The version of the color to display for the specified traits.
Discussion
Use this method when you need to resolve a dynamic color to a specific color value for the specified trait collection. For example, reading the cgColor property or calling getRed(_:green:blue:alpha:) resolves a dynamic color to a specific color value that’s no longer dynamic. If your calling context isn’t inside one of the methods documented in the current property, you need to provide a trait collection from an appropriate trait environment, such as your view or view controller.
The example below uses this method set a border color on a CALayer:
// This method sets the border color when UITraitCollection.current is undefined.
func updateBorderColor(layer: CALayer) {
// Read the trait collection from the view.
let traitCollection = view.traitCollection
// Use the trait collection to resolve a dynamic color.
let borderColor = UIColor.label.resolvedColor(with: traitCollection)
// Use the CGColor value of the resolved color.
layer.borderColor = borderColor.cgColor
}