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// Based on Kickstarter-Prelude version
// https://github.com/kickstarter/Kickstarter-Prelude/blob/master/Prelude-UIKit/UIImage.swift
extension UIImage {
/**
- parameter color: A color.
- returns: A 1x1 UIImage of a solid color.
*/
static func pixel(ofColor color: UIColor) -> UIImage {
let lightModeImage = UIImage.generatePixel(ofColor: color, userInterfaceStyle: .light)
let darkModeImage = UIImage.generatePixel(ofColor: color, userInterfaceStyle: .dark)
lightModeImage.imageAsset?.register(darkModeImage, with: UITraitCollection(userInterfaceStyle: .dark))
return lightModeImage
}
static private func generatePixel(ofColor color: UIColor, userInterfaceStyle: UIUserInterfaceStyle) -> UIImage {
var image: UIImage!
if #available(iOS 13.0, *) {
UITraitCollection(userInterfaceStyle: userInterfaceStyle).performAsCurrent {
image = .generatePixel(ofColor: color)
}
} else {
image = .generatePixel(ofColor: color)
}
return image
}
static private func generatePixel(ofColor color: UIColor) -> UIImage {
let pixel = CGRect(x: 0.0, y: 0.0, width: 1.0, height: 1.0)
UIGraphicsBeginImageContext(pixel.size)
defer { UIGraphicsEndImageContext() }
guard let context = UIGraphicsGetCurrentContext() else {
return UIImage()
}
context.setFillColor(color.cgColor)
context.fill(pixel)
return UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
}
}
// Based on Kickstarter-Prelude version
// https://github.com/kickstarter/Kickstarter-Prelude/blob/master/Prelude-UIKit/UIButton.swift
extension UIButton {
/**
Sets the background color of a button for a particular state.
- parameter backgroundColor: The color to set.
- parameter state: The state for the color to take affect.
*/
func setBackgroundColor(_ backgroundColor: UIColor, for state: UIControl.State) {
self.setBackgroundImage(.pixel(ofColor: backgroundColor), for: state)
}
}
let button = UIButton(type: .system)
button.setTitle("Tap Me", for: .normal)
button.tintColor = .white
button.setBackgroundImage(.pixel(ofColor: .systemBlue), for: .normal)
button.layer.cornerRadius = 20
button.layer.masksToBounds = true
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