How to tell the name of NSColor controlAccentColor

Question

I'd like to use [NSColor controlAccentColor] in a few places, however I would also like to fallback to a special tint of blue when the user selects the Blue system accent color.

How can I reliably detect the type / name of the controlAccentColor picked?

Answer 1

Ended up with this:

if (@available(macOS 10.14, *)) {
  NSColor *accentColor = [[NSColor controlAccentColor] colorUsingColorSpace:[NSColorSpace deviceRGBColorSpace]];
  CGFloat redColor, greenColor, blueColor, alphaColor;
  [accentColor getRed:&redColor green:&greenColor blue:&blueColor alpha:&alphaColor];
  if (blueColor == 1 && redColor <= 0.1 && greenColor <= 0.5) {
    // Our special blue
    return [NSColor colorWithRed:52.0 / 255.0 green:109.0 / 255.0 blue:251.0 / 255.0 alpha:0.9]; // pastel blue
  }
  return [NSColor controlAccentColor];
}

Answer 2

You can get the value for the the color with:

let accent = UserDefaults.standard.value(forKey: "AppleAccentColor")

This returns nil when your system Accent Color is set to blue, or an Int value when it is set to other colors (values listed here: How can I determine the macOS 10.14 accent color?)