Question

if([timer isValid])  // << breakpoint here
{
    NSLog(@"Timer Valid");
}
timer = [NSTimer scheduledTimerWithTimeInterval:[timeinterval intValue] target:self selector:@selector(PlayDelaySound) userInfo:nil  repeats:NO];

The function runs properly the first time when timer is not scheduled. However, for subsequent calls, while debugging, the console gives me the log (given below) logging on single stepping. and subsequently gives sigabrt.

Any help?.
Thanks

Log

Single stepping until exit from function objc_msgSend, 
which has no line number information.
warning: Remote failure reply: E37
Single stepping until exit from function objc_msgSend, 
which has no line number information.
warning: Remote failure reply: E37

Answer 1

Maybe you’re missing a retain?

Like this:

timer = [[NSTimer scheduledTimerWithTimeInterval:[timeinterval intValue] target:self selector:@selector(PlayDelaySound) userInfo:nil  repeats:NO]
         retain];

Update: because if you’re not retaining, the timer instance may be released sometime, and your call to isValid causes a crash.