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PORe-adding annotations on map view to update their title
 

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    <p>As you can see below, I have simulated my problem in a basic way. I have a timer that calls a method periodically. In that method, I have created a switch-case condition to simulate my idea.</p> <p>Once pin is added on the map, then reading (pin keeps dropping) them again. </p> <p>I want to add my pin and then just only change the title that represents a weather value. </p> <pre><code>- (IBAction)playBtn:(id)sender { timer = [NSTimer scheduledTimerWithTimeInterval:(4.0) target:self selector:@selector(control) userInfo:nil repeats:YES]; } -(void)control{ NSMutableArray *annotationArray = [[[NSMutableArray alloc] init] autorelease]; switch (value%2) { case 0: { // Create some annotations Annotation *annotation = nil; annotation = [[Annotation alloc] init]; annotation.coordinate = CLLocationCoordinate2DMake(29.7161,-95.3906); annotation.color = RGB(13, 0, 182); annotation.title = @"17"; [annotationArray addObject:annotation]; [annotation release]; annotation = [[Annotation alloc] init]; annotation.coordinate = CLLocationCoordinate2DMake(30.168456,-95.504480); annotation.color = RGB(0, 182, 146); annotation.title = @"16"; [annotationArray addObject:annotation]; [annotation release]; // Center map //self.mapView.visibleMapRect = [self makeMapRectWithAnnotations:annotationArray]; // Add to map //[self.mapView addAnnotations:annotationArray]; } break; case 1: { // Create some annotations Annotation *annotation = nil; annotation = [[Annotation alloc] init]; annotation.coordinate = CLLocationCoordinate2DMake(29.7161,-95.3906); annotation.color = RGB(13, 0, 182); annotation.title = @"27"; [annotationArray addObject:annotation]; [annotation release]; annotation = [[Annotation alloc] init]; annotation.coordinate = CLLocationCoordinate2DMake(30.168456,-95.504480); annotation.color = RGB(0, 182, 146); annotation.title = @"25"; [annotationArray addObject:annotation]; [annotation release]; } break; } [self.mapView addAnnotations:annotationArray]; [mapView setNeedsDisplay]; value++; </code></pre>
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