Question

我正在尝试了解CLPlacemark以及何时/如何为添加到地图的引脚的标注创建信息。在我几年前在更多iOS 3开发中阅读之前，他们反向对地址进行地理编码并构建地址（街道，邮政编码，州等）。首先，我需要自己构建这个字符串吗？我试图找出如何获取某些已知内容的位置名称，例如在下面的代码中搜索apple商店：

NSString *address = @"1 stockton, san francisco, ca";    
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
        [geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {

    [placemarks enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSLog(@"obj description: %@", [obj description]);

        CLPlacemark *aPlacemark = (CLPlacemark *)obj;
        NSLog(@"%@", [aPlacemark.addressDictionary description]);
        NSLog(@"name: %@", ((CLPlacemark *)obj).name);
    }];
];

当我打印出描述时，我看到控制台说：

Apple Store, San Francisco, 1 Stockton St, San Francisco, CA  94108-5805, United States @ <+37.78584545,-122.40651752> +/- 100.00m, region (identifier <+37.78584545,-122.40652161> radius 18.96) <+37.78584545,-122.40652161> radius 18.96m

它在哪里获得Apple Store，旧金山的名字？我以为它将是CLPlacemark.name属性，但它是null。因此，在尝试弄清楚如何创建name属性时，我发现：

        NSLog(@"%@", [aPlacemark.addressDictionary description]);

我得到了输出：

City = "San Francisco";
Country = "United States";
CountryCode = US;
FormattedAddressLines =     (
    "Apple Store, San Francisco",
    "1 Stockton St",
    "San Francisco, CA  94108-5805",
    "United States"
);
PostCodeExtension = 5805;
State = California;
Street = "1 Stockton St";
SubAdministrativeArea = "San Francisco";
SubLocality = "Union Square";
SubThoroughfare = 1;
Thoroughfare = "Stockton St";
ZIP = 94108;

由此可以看出，在addressDictionary的FormattedAddressLines键中，标题也在那里。

所以我想我的两个问题是：

1）如果有位置的名称（例如Apple Store），我该如何获得该位置的名称？

2）我是否需要再构建我的字符串，因为地址字典似乎已经为我做了这个？

谢谢！

Answer 1

您可以使用AddressBookUI框架中的ABCreateStringWithAddressDictionary函数从CLPlacemark的“addressDictionary”属性中获取地址字符串。

Answer 2

要回答您的第一个问题，请使用CLPlacemark的areasOfInterest属性。

至于第二个问题，那真的取决于你，以及你想如何格式化字符串。如果要使用addressDictionary属性中的字符串构建它，那么一定要这样做。您可以选择和选择零件，并在完成处理程序中创建一个字符串。

另外，您提到要创建用于在地图上显示的注释。我个人将MKAnnotation子类化，并使用它快速创建一个注释以显示在地图上。

MyAnnotation.h

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MyAnnotation : NSObject <MKAnnotation> {
    NSString *_name;
    NSString *_address;
    CLLocationCoordinate2D _coordinate;
}

@property (copy) NSString *name;
@property (copy) NSString *address;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate;

@end

MyAnnotation.m

#import "MyAnnotation.h"

@implementation MyAnnotation
@synthesize name = _name;
@synthesize address = _address;
@synthesize coordinate = _coordinate;

- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate
{
    if ((self = [super init])) {
        _name = [name copy];
        _address = [address copy];
        _coordinate = coordinate;
    }
    return self;
}

- (NSString *)title
{
    return _name;
}

- (NSString *)subtitle
{
    return _address;
}

@end

声明一个NSMutableArray来保存所有注释，并将initWithName:address:coordinate:抛出到你的完成处理程序中，你可以快速获得一个可以添加到地图中的注释数组。

NSString *address = @"1 stockton, san francisco, ca";    
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) 
{
   NSMutableArray *annotationArray = [NSMutableArray array];
   for (CLPlacemark *aPlacemark in placemarks)
   {
      NSString *nameString = // Get your name from an array created by aPlacemark.areasOfInterest;
      NSString *addressString = // Put your address string info you get from the placemark here.
      CLLocationCoordinate2D coordinate = aPlacemark.location.coordinate;
      MyAnnotation *annotation = [[MyAnnotation alloc] initWithName:nameString address:addressString coordinate:coordinate];
      [annotationArray addObject:annotation];
   }
   // Now save annotationArray if you want to use it later
   // Add it to your MapView with [myMapView addAnnotations:annotationArray];
}];

希望有所帮助！

CLPlacemark的“名称”

2 个答案: