How to add annotation in Map view In Iphone

I want to place an annotation on the Map view from the address 开发者_JAVA技巧typed in a text field using the MapKit instead of longitude and latitude in iphone.Whether is it possible to do that?If yes,how. Please provide some sample code to do this. Thanx in advance

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You have to get the lat/long via some manner (geocoding). Here's an example I found on an excellent MKMapView tutorial:

NSString * address = @”1600 Pennsylvania Ave, Washington DC”; // address here

NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:@","];
double latitude = 0.0;
double longitude = 0.0;
if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@”200″]) {
  latitude = [[listItems objectAtIndex:2] doubleValue];
  longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
  //Error handling
}

From http://www.invasivecode.com/2009/07/adding-maps-to-your-iphone-app-mapkit/