警报视图显示多次而不是一次

The Alert View shows many time not one time

我在我的函数中创建了 UIAlertView,问题是它在函数运行时显示了很多时间,我如何创建一个 if 语句只显示一次,就像 UIAlertView 显示一样不再显示。

- (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];
    
}

这是我的 UIAlertView 连续出现而不是一次出现的功能。

- (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.
        }
    }
}

使用布尔值:

bool alertIsShowing = false;

并在您的更新方法中输入如下内容:

if (trafficTicks > 10){
 if (!alertIsShowing){
     alertIsShowing = true;
     [self showAlert];
   }
}

然后当您的警报被解除时,重置您的布尔值:

alertIsShowing = false;