我需要对两个不同的地址进行地理编码，但我需要将结果放在相同的范围/方法内。我怎样才能在同一个块内location1引导相同的变量。location2这是我当前的代码...
- (IBAction)calculateDistance {
[textFieldDestination resignFirstResponder];
NSString *origin = [textFieldOrigin text];
if (origin) {
CLGeocoder *geoCode = [[CLGeocoder alloc] init];
[geoCode geocodeAddressString:origin completionHandler: ^(NSArray *placemarks, NSError *error) {
if (!error) {
CLPlacemark *place = [placemarks objectAtIndex:0];
CLLocation *location = place.location;
CLLocation *location1 = [[CLLocation alloc] initWithLatitude:location.coordinate.latitude longitude:location.coordinate.longitude];
} else {
NSString *string = [NSString stringWithFormat:@"%@ - also make sure you have inputted a valid city", [error localizedDescription]];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:string delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
}];
}
NSString *destination = [textFieldDestination text];
if (destination) {
CLGeocoder *geoCode2 = [[CLGeocoder alloc] init];
[geoCode2 geocodeAddressString:destination completionHandler:^(NSArray *placemarks, NSError *error) {
if (!error) {
CLPlacemark *place = [placemarks objectAtIndex:0];
CLLocation *location = place.location;
CLLocation *location2 = [[CLLocation alloc] initWithLatitude:location.coordinate.latitude longitude:location.coordinate.longitude];
} else {
NSString *string = [NSString stringWithFormat:@"%@ - also make sure you have inputted a valid city", [error localizedDescription]];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:string delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
}];
}
CLLocationDistance distanceM = [location1 distanceFromLocation:location2]; // obviously error so you can see that I need location1 and location2 in the same block.... but how!?
[metreDistance setText:[NSString stringWithFormat:@"%f", distanceM]];
}