Kronos is an NTP client library written in Swift. It supports sub-seconds precision and provides an stable monotonic clock that won't be affected by clock changes.
This is an
example app that displays the monotonic Clock.now on the left and the
system clock (initially out of date) on the right.
Calling Clock.sync will fire a bunch of NTP requests to up to 5 of the
servers on the given NTP pool (default is time.apple.com). As soon as
we get the first response, the given closure is called but the Clock
will keep trying to get a more accurate response.
Clock.sync { date, offset in
// This is the first sync (note that this is the fastest but not the
// most accurate run
print(date)
}Clock.now is a monotonic NSDate that won't be affected by clock
changes.
NSTimer.scheduledTimerWithTimeInterval(1.0, target: self,
selector: #selector(Example.tick),
userInfo: nil, repeats: true)
@objc func tick() {
print(Clock.now) // Note that this clock will get more accurate as
// more NTP servers respond.
}Embedded frameworks require a minimum deployment target of iOS 8 or OS X Mavericks (10.9).
CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:
$ gem install cocoapodsCocoaPods 0.39.0+ is required to build Kronos.
To integrate Kronos into your Xcode project using CocoaPods, specify it in
your Podfile:
platform :ios, '8.0'
use_frameworks!
pod 'Kronos'Then, run the following command:
$ pod installSwift PM is a tool for managing distribution of source code.
To integrate Kronos into your project using Swift PM use:
$ export SWIFT_EXEC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc
$ swift buildKronos is maintained by Lyft and released under the Apache 2.0 license. See LICENSE for details.