Question

I have a NSTimer running with scheduled time interval 1.Here I am keep tracking the current Time as given below.

- (void)myMethod:(NSTimer*)timer {

NSDate *startDate = [[[NSDate alloc] init] autorelease];
}

on some notification I am trying to find the difference between before and after time change.

-(void) handleNotification: (NSNotification*) notification
{    
    NSTimeInterval elapsedTimeInterval = [startDate timeIntervalSinceNow];
}

Here I am getting EXC_BAD_ACCESS.

If I use startDate = [[NSDate date] retain]; no crash,didn’t understand where to release startDate as I am invalidating this timer on dealloc.

Note:can’t use properties since need to support 10.4.

Regards,

Akbar

Answer 1

One way is to release the previous value and assign the new one.

1 Assign the value like this,

if (startDate) [startDate release];
startDate = [[NSDate date] retain];

2 Retrieve the value as usual,

NSTimeInterval elapsedTimeInterval = [startDate timeIntervalSinceNow];

3 Finally release it in dealloc method.