NSTimer extension with block support and the ability to pause and resume it

NSTimer+Extension.h

//
//  NSTimer+Extension.h
//  NSTimer+Extension
//
//  Created by Alvaro Franco on 4/25/14.
//  Copyright (c) 2014 AlvaroFranco. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSTimer (Extension)

+(id)scheduledTimerWithTimeInterval:(NSTimeInterval)inTimeInterval block:(void (^)())inBlock repeats:(BOOL)inRepeats;
+(id)timerWithTimeInterval:(NSTimeInterval)inTimeInterval block:(void (^)())inBlock repeats:(BOOL)inRepeats;

-(void)pauseTimer;
-(void)resumeTimer;

@end

NSTimer+Extension.m

//
//  NSTimer+Extension.m
//  NSTimer+Extension
//
//  Created by Alvaro Franco on 4/25/14.
//  Copyright (c) 2014 AlvaroFranco. All rights reserved.
//

#import "NSTimer+Extension.h"
#import <objc/runtime.h>

@implementation NSTimer (Extension)

+(id)scheduledTimerWithTimeInterval:(NSTimeInterval)inTimeInterval block:(void (^)())inBlock repeats:(BOOL)inRepeats {
    
    void (^block)() = [inBlock copy];
    id ret = [self scheduledTimerWithTimeInterval:inTimeInterval target:self selector:@selector(executeSimpleBlock:) userInfo:block repeats:inRepeats];

    return ret;
}

+(id)timerWithTimeInterval:(NSTimeInterval)inTimeInterval block:(void (^)())inBlock repeats:(BOOL)inRepeats {
    
    void (^block)() = [inBlock copy];
    id ret = [self timerWithTimeInterval:inTimeInterval target:self selector:@selector(executeSimpleBlock:) userInfo:block repeats:inRepeats];

    return ret;
}

+(void)executeSimpleBlock:(NSTimer *)inTimer {
    
    if([inTimer userInfo]) {
        void (^block)() = (void (^)())[inTimer userInfo];
        block();
    }
}

static NSString *const NSTimerPauseDate = @"NSTimerPauseDate";
static NSString *const NSTimerPreviousFireDate = @"NSTimerPreviousFireDate";

-(void)pauseTimer {
    
    objc_setAssociatedObject(self, (__bridge const void *)(NSTimerPauseDate), [NSDate date], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    objc_setAssociatedObject(self, (__bridge const void *)(NSTimerPreviousFireDate), self.fireDate, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    
    self.fireDate = [NSDate distantFuture];
}

-(void)resumeTimer {
    
    NSDate *pauseDate = objc_getAssociatedObject(self, (__bridge const void *)NSTimerPauseDate);
    NSDate *previousFireDate = objc_getAssociatedObject(self, (__bridge const void *)NSTimerPreviousFireDate);
    
    const NSTimeInterval pauseTime = -[pauseDate timeIntervalSinceNow];
    self.fireDate = [NSDate dateWithTimeInterval:pauseTime sinceDate:previousFireDate];
}

@end

Line:9 should be NSTimer+Extension.h

could you plz write how we can use it