##Creating a timer with Grand Central Dispatch
At the following is the implementation file of a sample class that shows, how to make a timer with the help of Grand Central Dispatch. The timer fires on a global queue, just change the queue to the main queue or any custom queue and the timer fires on this queue and not on the global queue anymore.
#import <Foundation/Foundation.h>
@interface SampleClass : NSObject
- (void)startTimer;