The Alert View shows many time not one time - objective-c

Question

I create UIAlertView in my function, the problem is it shows a lot of time when the function runs, how can I create an if statement to show only one time like if UIAlertView shows not show any more.
- (void)showAlert {
_myAlertView = nil;
_myAlertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(#"Call_On_Hold",nil)
message:NSLocalizedString(#"Please_Wait",nil)
delegate:self
cancelButtonTitle:NSLocalizedString(#"Close_call",nil)
otherButtonTitles:nil, nil];
_myAlertView.tag = myAlertViewsTag;
[_myAlertView show];
}
Here is the function that my UIAlertView appear continuously instead of one time.
- (void) trafficTimerRun:(NSTimer*)theTimer
{
++ trafficTimerTicks;
pjmedia_rtcp_stat stat;
if (!get_stream_info([call_id intValue], &stat)) {
return;
}
LogDebug(TAG_SIP, #"Got %d bytes on stream 0 (previous: %d)", stat.rx.bytes, prev_bytes);
if (stat.rx.bytes == prev_bytes) {
if (trafficTimerTicks >= 10) {
// Steve-note: Here we need to show a pop-up message when the call in on hold when the trafficTimerTicks run.
[self showAlert];
LogError(TAG_SIP, #"No traffic received, hanging up");
// [theTimer invalidate];
// broken = YES; Steve note: The call shouldnt broke.
// [self hangup]; Steve note: The call shouldnt hangup.
}
}
}

Answer 1

Use a boolean:
bool alertIsShowing = false;
and in your updating method put something like this:
if (trafficTicks > 10){
if (!alertIsShowing){
alertIsShowing = true;
[self showAlert];
}
}
Then when your alert is dismissed, reset your boolean:
alertIsShowing = false;