Chronos is a collection of useful Grand Central Dispatch utilities. If you have any specific requests or ideas for new utilities, don't hesitate to create a new issue.
Chronos is part of a larger library for iOS and OS X called Olympus, which is currently under active development.
- DispatchTimer - A repeating timer that fires according to a static interval, e.g. "Fire every 5 seconds".
- VariableTimer - A repeating timer that allows you to vary the interval between firings, e.g. "Fire according to the function
interval = 2 * count."
Chronos is available through Cocoa Pods. Add the following to your Podfile:
pod 'Chronos'#import <Chronos/Chronos.h>
/** Create and start a timer */
CHRDispatchTimer timer = [CHRDispatchTimer timerWithInterval:1.0
executionBlock:^(CHRDispatchTimer *__weak timer, NSUInteger invocation) {
NSLog(@"%@", @"Execute repeating task here");
}];
[timer start:YES]; // Fire timer immediately
/** Pausing the timer */
[timer pause];
/** Permanently canceling the timer */
[timer cancel];
#import <Chronos/Chronos.h>
/** Create and start a timer */
CHRVariableTimer *timer = [CHRVariableTimer timerWithIntervalProvider:^NSTimeInterval(CHRVariableTimer *__weak timer, NSUInteger nextInvocation) {
return 2 * count; // Return interval according to function
} executionBlock:^(__weak id<CHRRepeatingTimer> timer, NSUInteger invocation) {
NSLog(@"Execute repeating task here");
}];
[timer start:YES]; // Fire timer immediately
/** Pausing the timer */
[timer pause];
/** Permanently canceling the timer */
[timer cancel];- iOS 7.0 or higher
- OS X 10.9 or higher
Chronos is available under the MIT License.