Закончено этим:
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];
}