86
如何检索用户的当前城市名称？如何检索用户的当前城市名称？
A
回答
107
，你所要做的就是建立一个CLLocationManager会找到你当前坐标。使用当前坐标，您需要使用MKReverseGeoCoder来查找您的位置。
- (void)viewDidLoad
{
// this creates the CCLocationManager that will find your current location
CLLocationManager *locationManager = [[[CLLocationManager alloc] init] autorelease];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
[locationManager startUpdatingLocation];
}
// this delegate is called when the app successfully finds your current location
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
// this creates a MKReverseGeocoder to find a placemark using the found coordinates
MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
geoCoder.delegate = self;
[geoCoder start];
}
// this delegate method is called if an error occurs in locating your current location
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"locationManager:%@ didFailWithError:%@", manager, error);
}
// this delegate is called when the reverseGeocoder finds a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{
MKPlacemark * myPlacemark = placemark;
// with the placemark you can now retrieve the city name
NSString *city = [myPlacemark.addressDictionary objectForKey:(NSString*) kABPersonAddressCityKey];
}
// this delegate is called when the reversegeocoder fails to find a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
NSLog(@"reverseGeocoder:%@ didFailWithError:%@", geocoder, error);
}
-10
阅读MKReverseGeocoder的文档 - 文档，指南& Apple提供的示例应用程序是有原因的。
+2
MKReverseGeoCoder已被弃用 – Marc 2012-04-04 16:35:09
2
您必须获取用户的当前位置，然后使用MKReverseGeocoder识别城市。
在iPhone App Programming Guide第8章中有很好的例子。 一旦你有位置初始化地理编码器，设置代理并从地标读取国家。阅读MKReverseGeocodeDelegate文档和创建方法：
- reverseGeocoder：didFindPlacemark：
reverseGeocoder：didFailWithError：
MKReverseGeocoder *geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate]; geocoder.delegate = self; [geocoder start];
+0
弃用...... – 2013-06-19 07:29:43
122
从iOS 5起MKReverseGeoCoder已弃用！
所以你想使用CLGeocoder与CLLocationManager，非常简单，并与块一起工作。
例子：
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
[self.locationManager stopUpdatingLocation];
CLGeocoder * geoCoder = [[CLGeocoder alloc] init];
[geoCoder reverseGeocodeLocation:newLocation
completionHandler:^(NSArray *placemarks, NSError *error) {
for (CLPlacemark *placemark in placemarks) {
.... = [placemark locality];
}
}];
}
编辑：一个for in循环相反的，你也可以这样做：
NSString *locString = placemarks.count ? [placemarks.firstObject locality] : @"Not Found";
16
如果有人试图从MKReverseGeocoder移动到CLGeocoder然后我写一个博客文章，可能会有所帮助http://jonathanfield.me/jons-blog/clgeocoder-example.html
基本上，一个例子是，在创建locationManager和CLGeocoder对象后，只需将此代码添加到viewDidLoad（），然后制作一些标签或文本区域以显示数据。
[super viewDidLoad];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
[self.CLGeocoder reverseGeocodeLocation: locationManager.location completionHandler:
^(NSArray *placemarks, NSError *error) {
CLPlacemark *placemark = [placemarks objectAtIndex:0];
isoCountryCode.text = placemark.ISOcountryCode;
country.text = placemark.country;
postalCode.text= placemark.postalCode;
adminArea.text=placemark.administrativeArea;
subAdminArea.text=placemark.subAdministrativeArea;
locality.text=placemark.locality;
subLocality.text=placemark.subLocality;
thoroughfare.text=placemark.thoroughfare;
subThoroughfare.text=placemark.subThoroughfare;
//region.text=placemark.region;
}];
+0
将崩溃，如果空 – Marc 2012-04-17 15:22:41
+0
@macayer是的，*会*崩溃如果是空的，但如果我理解正确，则永远不会为空。将包含1个或更多元素或者是'nil'，并且发送到'nil'的消息导致'nil'，以及通过'nil'通过点符号访问属性。话虽如此，我们应该经常检查'错误'是不是'非'。 – 2013-05-08 11:52:53
28
这是对我工作的罚款：
CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
[geocoder reverseGeocodeLocation:self.locationManager.location
completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(@"reverseGeocodeLocation:completionHandler: Completion Handler called!");
if (error){
NSLog(@"Geocode failed with error: %@", error);
return;
}
CLPlacemark *placemark = [placemarks objectAtIndex:0];
NSLog(@"placemark.ISOcountryCode %@",placemark.ISOcountryCode);
NSLog(@"placemark.country %@",placemark.country);
NSLog(@"placemark.postalCode %@",placemark.postalCode);
NSLog(@"placemark.administrativeArea %@",placemark.administrativeArea);
NSLog(@"placemark.locality %@",placemark.locality);
NSLog(@"placemark.subLocality %@",placemark.subLocality);
NSLog(@"placemark.subThoroughfare %@",placemark.subThoroughfare);
}];
1
您可以使用此代码获取当前城市： -
扩展YourController：CLLocationManagerDelegate { FUNC的LocationManager（经理：CLLocationManager ，didUpdateLocations位置：[CLLocation]） {
CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in
if (error != nil)
{
manager.stopUpdatingLocation()
return
}
else
{
if placemarks!.count > 0
{
let placeMarksArrray: NSArray = placemarks!
let pm = placeMarksArrray[0] as! CLPlacemark
self.displayLocationInfo(pm)
manager.stopUpdatingLocation()
} else
{
print("Problem with the data received from geocoder")
}
}
})
}
func displayLocationInfo(placemark: CLPlacemark!) {
if (placemark != nil) {
//stop updating location to save battery life
locationLocation.stopUpdatingLocation()
var tempString : String = ""
if(placemark.locality != nil){
tempString = tempString + placemark.locality! + " "
print(placemark.locality)
}
if(placemark.postalCode != nil){
tempString = tempString + placemark.postalCode! + " "
print(placemark.postalCode)
}
if(placemark.administrativeArea != nil){
tempString = tempString + placemark.administrativeArea! + " "
print(placemark.administrativeArea)
}
if(placemark.country != nil){
tempString = tempString + placemark.country! + " "
}
let dictForaddress = placemark.addressDictionary as! NSDictionary
if let city = dictForaddress["City"] {
print(city)
}
strLocation = tempString
}
}
0
// place the function code below in desire location in program.
// [self getCurrentLocation];
-(void)getCurrentLocation
{
CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
[geocoder reverseGeocodeLocation:self->locationManager.location
completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(@"reverseGeocodeLocation:completionHandler: Completion Handler called!");
if (error){
NSLog(@"Geocode failed with error: %@", error);
return;
}
CLPlacemark *placemark = [placemarks objectAtIndex:0];
NSLog(@"placemark.ISOcountryCode %@",placemark.ISOcountryCode);
NSLog(@"placemark.country %@",placemark.country);
NSLog(@"placemark.locality %@",placemark.locality);
NSLog(@"placemark.postalCode %@",placemark.postalCode);
NSLog(@"placemark.administrativeArea %@",placemark.administrativeArea);
NSLog(@"placemark.locality %@",placemark.locality);
NSLog(@"placemark.subLocality %@",placemark.subLocality);
NSLog(@"placemark.subThoroughfare %@",placemark.subThoroughfare);
}];
}
3
如果有人需要它斯威夫特3，我这是怎么做的：
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations.first!
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, 500, 500)
self.location = location
self.locationManager?.stopUpdatingLocation()
// Drop a pin at user's Current Location
let myAnnotation: MKPointAnnotation = CustomPointAnnotation()
myAnnotation.coordinate = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
myAnnotation.title = "Localização"
self.mapViewMK.addAnnotation(myAnnotation)
self.mapViewMK.setRegion(coordinateRegion, animated: true)
self.locationManager?.stopUpdatingLocation()
self.locationManager = nil
// Get user's current location name
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(self.location!) { (placemarksArray, error) in
if (placemarksArray?.count)! > 0 {
let placemark = placemarksArray?.first
let number = placemark!.subThoroughfare
let bairro = placemark!.subLocality
let street = placemark!.thoroughfare
self.addressLabel.text = "\(street!), \(number!) - \(bairro!)"
}
}
}
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一记：你有藏匿位置管理器在一个ivar（也许一旦你收到一个位置，可能再次停止），否则它会立即autoreleased，你将不会收到任何代表回调。另外，反向地理编码器需要互联网连接才能正常工作。 – uliwitness 2011-02-23 17:19:47
你能说我如何打印标题和副标题上的当前城市或位置吗？ – Raju 2012-08-27 05:36:58
@Frade #import –
Jonathan
2013-01-10 03:03:10