Category on NSTimer that adds Blocks support.

NSTimer+Blocks.h

#import <Foundation/NSTimer.h>

@interface NSTimer (PSYBlockTimer)
+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)seconds repeats:(BOOL)repeats usingBlock:(void (^)(NSTimer *timer))fireBlock;
+ (NSTimer *)timerWithTimeInterval:(NSTimeInterval)seconds repeats:(BOOL)repeats usingBlock:(void (^)(NSTimer *timer))fireBlock;
@end





#import "NSTimer+Blocks.h"

typedefvoid (^PSYTimerBlock)(NSTimer *);

#define SELF_EXECUTING 1

#if defined(SELF_EXECUTING) && SELF_EXECUTING

@interface NSTimer (PSYBlockTimer_private)
+ (void)PSYBlockTimer_executeBlockWithTimer:(NSTimer *)timer;
@end


@implementation NSTimer (PSYBlockTimer)
+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)seconds repeats:(BOOL)repeats usingBlock:(void (^)(NSTimer *timer))fireBlock
{
  return [selfscheduledTimerWithTimeInterval:seconds target:selfselector:@selector(PSYBlockTimer_executeBlockWithTimer:) userInfo:[[fireBlock copy] autorelease] repeats:repeats];
}

+ (NSTimer *)timerWithTimeInterval:(NSTimeInterval)seconds repeats:(BOOL)repeats usingBlock:(void (^)(NSTimer *timer))fireBlock
{
  return [selftimerWithTimeInterval:seconds target:selfselector:@selector(PSYBlockTimer_executeBlockWithTimer:) userInfo:[[fireBlock copy] autorelease] repeats:repeats];
}
@end


@implementation NSTimer (PSYBlockTimer_private)
+ (void)PSYBlockTimer_executeBlockWithTimer:(NSTimer *)timer
{
  PSYTimerBlock block = [timer userInfo];
  block(timer);
}
@end

#else

// Private helper class
__attribute__((visibility("hidden")))
@interface _PSYBlockTimer : NSObject { PSYTimerBlock block; }
+ (id)blockTimer;
@property(copy) PSYTimerBlock block;
- (void)executeBlockWithTimer:(NSTimer *)timer;
@end

@implementation NSTimer (PSYBlockTimer)
+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)seconds repeats:(BOOL)repeats usingBlock:(void (^)(NSTimer *timer))fireBlock
{
  _PSYBlockTimer *blkTimer = [_PSYBlockTimer blockTimer];
  [blkTimer setBlock:fireBlock];
  return [self scheduledTimerWithTimeInterval:seconds target:blkTimer selector:@selector(executeBlockWithTimer:) userInfo:nil repeats:repeats];
}

+ (NSTimer *)timerWithTimeInterval:(NSTimeInterval)seconds repeats:(BOOL)repeats usingBlock:(void (^)(NSTimer *timer))fireBlock
{
  _PSYBlockTimer *blkTimer = [_PSYBlockTimer blockTimer];
  [blkTimer setBlock:fireBlock];
  return [self timerWithTimeInterval:seconds target:blkTimer selector:@selector(executeBlockWithTimer:) userInfo:nil repeats:repeats];
}
@end

@implementation _PSYBlockTimer
@synthesize block;

+ (id)blockTimer { return [[[self alloc] init] autorelease]; }
- (void)executeBlockWithTimer:(NSTimer *)timer
{
  block(timer);
}
- (void)dealloc
{
  [block release];
  [super dealloc];
}
@end

#endif