session-ios/SignalMessaging/Loki/UIColor+Helper.swift
Niels Andriesse 1338fcda21 Clean
2019-09-10 13:26:58 +10:00

48 lines
1.6 KiB
Swift

extension UIColor {
public func adjust(hueBy degrees: CGFloat) -> UIColor {
var currentHue: CGFloat = 0.0
var currentSaturation: CGFloat = 0.0
var currentBrigthness: CGFloat = 0.0
var currentAlpha: CGFloat = 0.0
if getHue(&currentHue, saturation: &currentSaturation, brightness: &currentBrigthness, alpha: &currentAlpha) {
// Round values so we get closer values to Desktop
let currentHueDegrees = (currentHue * 360.0).rounded()
let normalizedDegrees = fmod(degrees, 360.0).rounded()
// Make sure we're in the range 0 to 360
var newHue = fmod(currentHueDegrees + normalizedDegrees, 360.0)
if (newHue < 0) { newHue = 360 + newHue }
let decimalHue = (currentHueDegrees + normalizedDegrees) / 360.0
return UIColor(hue: decimalHue,
saturation: currentSaturation,
brightness: currentBrigthness,
alpha: 1.0)
} else {
return self
}
}
convenience init(red: Int, green: Int, blue: Int, a: CGFloat = 1.0) {
self.init(
red: CGFloat(red) / 255.0,
green: CGFloat(green) / 255.0,
blue: CGFloat(blue) / 255.0,
alpha: a
)
}
convenience init(rgb: Int, a: CGFloat = 1.0) {
self.init(
red: (rgb >> 16) & 0xFF,
green: (rgb >> 8) & 0xFF,
blue: rgb & 0xFF,
a: a
)
}
}