以编程方式/手动创建MKPlacemark/CLPlacemark

Question

问题

我有一套地名信息(国家、城市等)和一对Lat/Lon。我想用它来创建一个MKPlacemark对象。

讨论

似乎这个类只能由

- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate addressDictionary:(NSDictionary *)addressDictionary

其docs状态状态

您可以为您已经拥有地址信息的实体(如通讯簿中的联系人)手动创建placemark对象。创建placemark对象显式地避免了查询反向Geo编码器对象以获取相同信息的需要。

太棒了！我已经进行了反向地理编码，并希望避免这样的查询。我能在字典里加些什么？

有关可用于本词典键的字符串列表，请参见ABPerson引用中的“Address属性”常量。所有的键都应该在字典的顶层。

它显示了相关的键

const ABPropertyID kABPersonAddressProperty;
const CFStringRef kABPersonAddressStreetKey;
const CFStringRef kABPersonAddressCityKey;
const CFStringRef kABPersonAddressStateKey;
const CFStringRef kABPersonAddressZIPKey;
const CFStringRef kABPersonAddressCountryKey;
const CFStringRef kABPersonAddressCountryCodeKey;

这与MKPlacemark的基本特性相差甚远：

访问位置数据的

• 位置属性

访问Placemark属性的

名property

• addressDictionary property

• ISOcountryCode property

• country property

• postalCode property

• administrativeArea property

• subAdministrativeArea property

• locality property

• subLocality property

• thoroughfare property

• subThoroughfare property

• region property

访问地理信息

property

• ocean
• inlandWater

访问地标信息

• areasOfInterest属性

幸运的是，MKPlacemark的超类的实际头文件说明了地址字典的一些内容：

// address dictionary properties

@property (nonatomic, readonly) NSString *name; // eg. Apple Inc.

@property (nonatomic, readonly) NSString *thoroughfare; // street address, eg. 1 Infinite Loop

@property (nonatomic, readonly) NSString *subThoroughfare; // eg. 1

@property (nonatomic, readonly) NSString *locality; // city, eg. Cupertino

@property (nonatomic, readonly) NSString *subLocality; // neighborhood, common name, eg. Mission District

@property (nonatomic, readonly) NSString *administrativeArea; // state, eg. CA

@property (nonatomic, readonly) NSString *subAdministrativeArea; // county, eg. Santa Clara

@property (nonatomic, readonly) NSString *postalCode; // zip code, eg. 95014

@property (nonatomic, readonly) NSString *ISOcountryCode; // eg. US

@property (nonatomic, readonly) NSString *country; // eg. United States

@property (nonatomic, readonly) NSString *inlandWater; // eg. Lake Tahoe

@property (nonatomic, readonly) NSString *ocean; // eg. Pacific Ocean

@property (nonatomic, readonly) NSArray *areasOfInterest; // eg. Golden Gate Park

因此，我创建了一本字典，然后按如下方式传递：

return [[[MKPlacemark alloc] initWithCoordinate:aLocation.coordinate addressDictionary:addressDictionary] autorelease];

不幸的是，在所有这些之后，内省表明这些信息并不适用于：

NSLog(@"placemark %@ from %@", placemark, addressDictionary);
NSLog(@"has %@", placemark.thoroughfare);

打印

2012-01-31 20:14:22.545 [15450:1403] placemark <+___,-___> +/- 0.00m from {
administrativeArea = __;
postalCode = _____;
subAdministrativeArea = ___;
subThoroughfare = __;
thoroughfare = "_____";
}
2012-01-31 20:14:22.545[15450:1403] has (null)

结论

所以，我就快到最后了。有人知道如何创建自己的MKPlacemark吗？谢谢。

Answer 1

您可以子类MKPlacemark

在MyPlacemark.h中

@interface MyPlacemark : MKPlacemark

extern NSString * const kCustomPlacemarkAddressThoroughfareKey;
extern NSString * const kCustomPlacemarkAddressSubThoroughfareKey;
extern NSString * const kCustomPlacemarkAddressLocalityKey;
extern NSString * const kCustomPlacemarkAddressSubLocalityKey;
extern NSString * const kCustomPlacemarkAddressAdministrativeAreaKey;
extern NSString * const kCustomPlacemarkAddressSubAdministrativeAreaKey;
extern NSString * const kCustomPlacemarkAddressPostalCodeKey;
extern NSString * const kCustomPlacemarkAddressCountryKey;
extern NSString * const kCustomPlacemarkAddressCountryCodeKey;

@end

在MyPlacemark.m中

#import "MyPlacemark.h"

@implementation MyPlacemark

NSString * const kCustomPlacemarkAddressThoroughfareKey = @"thoroughfare";
NSString * const kCustomPlacemarkAddressSubThoroughfareKey = @"subThoroughfare";
NSString * const kCustomPlacemarkAddressLocalityKey = @"locality";
NSString * const kCustomPlacemarkAddressSubLocalityKey = @"subLocality";
NSString * const kCustomPlacemarkAddressAdministrativeAreaKey = @"administrativeArea";
NSString * const kCustomPlacemarkAddressSubAdministrativeAreaKey = @"subAdministrativeArea";
NSString * const kCustomPlacemarkAddressPostalCodeKey = @"postalCode";
NSString * const kCustomPlacemarkAddressCountryKey = @"country";
NSString * const kCustomPlacemarkAddressCountryCodeKey = @"countryCode";

- (NSString *)thoroughfare
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressThoroughfareKey];
}

- (NSString *)subThoroughfare
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressSubThoroughfareKey];
}

- (NSString *)locality
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressLocalityKey];
}

- (NSString *)subLocality
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressSubLocalityKey];
}

- (NSString *)administrativeArea
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressAdministrativeAreaKey];
}

- (NSString *)subAdministrativeArea
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressSubAdministrativeAreaKey];
}

- (NSString *)postalCode
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressPostalCodeKey];
}

- (NSString *)country
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressCountryKey];    
}

- (NSString *)countryCode
{
    return [self.addressDictionary objectForKey:kCustomPlacemarkAddressCountryCodeKey];
}

@end

看起来很难看，但到目前为止，这是我找到的唯一可行的方法。