How can I store CMTime in UserDefaults and then parse it?

Well, I try to remember currentTime() from AVPlayer in the device memory, for continue playing video after app restart.

I'm making app for watching films from my Raspberry PI. Any ideas?

Here's an extension to UserDefaults that lets you save and restore a CMTime value:

import CoreMedia

extension UserDefaults {
    func cmtime(forKey key: String) -> CMTime? {
        if let timescale = object(forKey: key + ".timescale") as? NSNumber {
            let seconds = double(forKey: key + ".seconds")
            return CMTime(seconds: seconds, preferredTimescale: timescale.int32Value)
        } else {
            return nil
        }
    }

    func set(_ cmtime: CMTime, forKey key: String) {
        let seconds = cmtime.seconds
        let timescale = cmtime.timescale

        set(seconds, forKey: key + ".seconds")
        set(NSNumber(value: timescale), forKey: key + ".timescale")
    }
}