A convenient dispatch_after() category

NSObject+BlockDelay.m

/* NSObject+BlockDelay.h */
 
#import <Foundation/Foundation.h>
 
@interface NSObject (BlockDelay)
 
- (void)performBlock:(void (^)(void))block afterDelay:(NSTimeInterval)delay;
 
@end
 


/* NSObject+BlockDelay.m */
 
#import "NSObject+BlockDelay.h"
 
@implementation NSObject (BlockDelay)

- (void)performBlock:(void (^)(void))block afterDelay:(NSTimeInterval)delay {
    dispatch_time_t delay_time = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delay * NSEC_PER_SEC));
    dispatch_after(delay_time, dispatch_get_main_queue(), block);
}

@end

Updated to a category instead of a macro, based on this implementation.