ios - 如何在地理编码中设置标准的 cityOutlet？

Question

我正在制作一个应用程序，用户可以在其中设置 UITextField 中的地址并获取 map 上的位置。
我希望 cityOutlet 不可见，但固定在城市“阿姆斯特丹”。

有没有办法做到这一点？我找不到解决这个问题的方法，还是我太笨了..

@property (weak, nonatomic) IBOutlet UITextField *addressOutlet;
@property (weak, nonatomic) IBOutlet UITextField *cityOutlet;

@property (strong, nonatomic) CLLocation *selectedLocation;
@property (strong, nonatomic) NSMutableDictionary *placeDictionary;

- (void)viewDidLoad
{
    [super viewDidLoad];

  self.addressOutlet.delegate = self;
  self.cityOutlet.delegate = self;
  self.mapView.delegate = self;

  self.placeDictionary = [[NSMutableDictionary alloc] init];
  CLLocationCoordinate2D zoomLocation;
  zoomLocation.latitude = 40.740848;
  zoomLocation.longitude= -73.991134;
  MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 1609.344,1609.344);
  [self.mapView setRegion:viewRegion animated:YES];

}

- (void)updatePlaceDictionary {

  [self.placeDictionary setValue:self.addressOutlet.text forKey:@"Street"];
  [self.placeDictionary setValue:self.cityOutlet.text forKey:@"City"];
}

- (void)updateMaps {

    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder geocodeAddressDictionary:self.placeDictionary completionHandler:^(NSArray *placemarks, NSError *error) {
      if([placemarks count]) {
        CLPlacemark *placemark = [placemarks objectAtIndex:0];
        CLLocation *location = placemark.location;
        CLLocationCoordinate2D coordinate = location.coordinate;
        [self.mapView setCenterCoordinate:coordinate animated:YES];
      } else {
        NSLog(@"error, geen adres gevonden");
      }
    }];

}

- (void)delayedReverseGeocodeLocation {

  [NSObject cancelPreviousPerformRequestsWithTarget:self];

  [self reverseGeocodeLocation];
}

- (void)reverseGeocodeLocation {

  CLGeocoder *geocoder = [[CLGeocoder alloc] init];
  [geocoder reverseGeocodeLocation:self.selectedLocation completionHandler:^(NSArray *placemarks, NSError *error) {

    if(placemarks.count){
      NSDictionary *dictionary = [[placemarks objectAtIndex:0] addressDictionary];
      [self.addressOutlet setText:[dictionary valueForKey:@"Street"]];
      [self.cityOutlet setText:[dictionary valueForKey:@"City"]];
    }
  }];
}

- (IBAction)submitTapped:(id)sender {
  [self updatePlaceDictionary];
  [self updateMaps];
}

Answer 1

在 -viewDidLoad 中隐藏 UILabel 导出并设置其文本试试这个:

self.cityOutlet.text = @"Amsterdam";
self.cityOutlet.hidden = YES;

然后在您的反向地理编码定位方法中注释掉/删除这一行:

//[self.cityOutlet setText:[dictionary valueForKey:@"City"]];

或者，如果您不使用 cityOutlet 标签来保存字符串，请尝试在您的实现文件中使用 NSString 属性而不是 outlet。

@property (nonatomic, strong) NSString* cityName;