gistfile1.txt

// declare
@property (retain) NSTimer *unregisteredTimer;



// implements
- (IBAction)createUnregisteredTimer:sender {

    NSMethodSignature *methodSignature = [self methodSignatureForSelector:@selector(invocationMethod:)];

    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];

    [invocation setTarget:self];

    [invocation setSelector:@selector(invocationMethod:)];

    NSDate *startDate = [NSDate date];

    [invocation setArgument:&startDate atIndex:2];


    NSTimer *timer = [NSTimer timerWithTimeInterval:0.5 invocation:invocation repeats:YES];

    self.unregisteredTimer = timer;

}

 

- (IBAction)startUnregisteredTimer:sender {

    if (unregisteredTimer != nil) {

        NSRunLoop *runLoop = [NSRunLoop currentRunLoop];

        [runLoop addTimer:unregisteredTimer forMode:NSDefaultRunLoopMode];

    }

}

- (IBAction)stopUnregisteredTimer:sender {

    [unregisteredTimer invalidate];

    self.unregisteredTimer = nil;

}