One of my coworkers shared What Colour Is It in our design Slack channel the other day. It works by taking the current time as 6 digits and making that a hex color. For example, in the header it's #172952. That's 5:29pm and 52 seconds. Kinda neat. I thought it was super cool so I decided to make it a screensaver.

You can download the screensaver here.

It's less than 100 lines of code. Give it a look if you're interested. I'm particularly fond of the font. I'm using new Swift 2 runtime checking:

if #available(OSX 10.11, *) {
    font = NSFont.systemFontOfSize(fontSize, weight: NSFontWeightThin)
} else {
    font = NSFont(name: "HelveticaNeue-Thin", size: fontSize)!
}

If it's El Capitan, San Francisco is used. Otherwise, Helvetica is used. The weight parameter is new in 10.11 so the check is necessary. Another cool thing is the numbers are monospace so it doesn't look funny as it ticks.

let fontDescriptor = font.fontDescriptor.fontDescriptorByAddingAttributes([
    NSFontFeatureSettingsAttribute: [
        [
            NSFontFeatureTypeIdentifierKey: kNumberSpacingType,
            NSFontFeatureSelectorIdentifierKey: kMonospacedNumbersSelector
        ]
    ]
])

The font descriptor API is pretty ugly, but you can do really neat things with it. You can get a font out of a font descriptor like this:

NSFont(descriptor: fontDescriptor, size: fontSize)

Anyway, enjoy the screensaver. I'd love to hear what you think of it. Hit me up on Twitter.