Question

theTimer = [NSTimer scheduledTimerWithTimeInterval:1.00 target:self selector:@selector(sendMessageHandler:) userInfo:nil repeats:YES];

//////////////////////////////////////////////////////

- (void)sendMessageHandler (NSTimer *) timer {

}

Ok so sendMessageHandler is triggering every second. But now, I want it to check the value of “theString” and if it changed value from the previous run, do something.

Can someone help me?

Thanks!

Answer 1

Make another string called prevString.

Make them equal each other initially. Then in the timer:

if ([theString isEqualToString:prevString]) {
    //No change.
}
else {
    //Change happened.
    prevString = theString;
}

And for memory management in dealloc:

[theString release];
[prevString release];