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我需要地理編碼兩個不同的地址，但我需要在相同的範圍/方法內的結果。我怎樣才能將相同變量location1和location2指向同一個塊內。 這裏是我當前的代碼...CLGeocoder多地址？
- (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]];
}