ios - 从 iOS 中的邮政编码自动填充城市和州

Question

我的 View 中有三个文本字段。1. 邮政编码，2. 城市和 3. 州。

如何在 iOS 中根据邮政编码自动填充城市和州字段？

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *currentString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    int length = [currentString length];
    if(length > 5)
    {
        return NO;
    }
    if(length == 5)
    {
        [self getCityAndState];
    }
    return YES;
}

- (void) getCityAndState
{
    //How to use google (or any) api to autofill city and state in objective - c?
}

Answer 1

我尽量避免使用 Google 的服务，因为它们往往会按一定的使用量收费。这是使用 Apple 框架的解决方案:

 #import <CoreLocation/CoreLocation.h>
 #import <AddressBookUI/AddressBookUI.h>

- (void)didEnterZip:(NSString*)zip
{
    CLGeocoder* geoCoder = [[CLGeocoder alloc] init];
    [geoCoder geocodeAddressDictionary:@{(NSString*)kABPersonAddressZIPKey : zip} 
      completionHandler:^(NSArray *placemarks, NSError *error) {
        if ([placemarks count] > 0) {
            CLPlacemark* placemark = [placemarks objectAtIndex:0];

            NSString* city = placemark.addressDictionary[(NSString*)kABPersonAddressCityKey];
            NSString* state = placemark.addressDictionary[(NSString*)kABPersonAddressStateKey];
            NSString* country = placemark.addressDictionary[(NSString*)kABPersonAddressCountryCodeKey];

        } else {
            // Lookup Failed
        }
    }];
}