通过 GPS 信息获取当前所在城市名的代码

利用 iPhone、iPad 自带的 GPS 信息可以获得当前位置坐标，但直接高速用户坐标是不行的。CocoaChina 会员"laigb"分享了通过 GPS 信息获取当前所在城市名的代码，希望对苹果开发者有所帮助。

#import "testLocationViewController.h"

@implementation testLocationViewController

@synthesize locationManger = _locationManger;

- (void)dealloc

{

[super dealloc];

[_locationManger release];

}

- (void)didReceiveMemoryWarning

{

// Releases the view if it doesn't have a superview.

[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.

}

#pragma mark - View lifecycle

- (void)viewDidLoad

{

[super viewDidLoad];

cityLabel = [[[UILabel alloc] initWithFrame: CGRectMake(20, 30, 100, 100)] autorelease];

[self.view addSubview: cityLabel];

/*

self.locationManger = [[CLLocationManager alloc] init];

_locationManger.delegate = self;

_locationManger.desiredAccuracy = kCLLocationAccuracyBest;

[_locationManger startUpdatingLocation];

*/

_locationManger = [[CLLocationManager alloc] init];

_locationManger.delegate = self;

_locationManger.distanceFilter = 1;

_locationManger.desiredAccuracy = kCLLocationAccuracyBest;

[_locationManger startUpdatingLocation];

}

- (void)viewDidUnload

{

[super viewDidUnload];

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

// Return YES for supported orientations

return YES;

}

- (void)locationManager:(CLLocationManager *)manager

didFailWithError:(NSError *)error

{

}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

{

CLLocationDistance l = newLocation.coordinate.latitude;//得到经度

CLLocationDistance v = newLocation.coordinate.longitude;//得到纬度

NSLog(@"%f %f", l,v);

CLLocation *new = [[CLLocation alloc] initWithLatitude: 11.0 longitude: 12.0];

CLLocationDistance u = [newLocation distanceFromLocation: new];

NSLog(@"%f", u);

[self startedReverseGeoderWithLatitude: l longitude: v];

}

- (void)startedReverseGeoderWithLatitude:(double)latitude longitude:(double)longitude{

CLLocationCoordinate2D coordinate2D;

coordinate2D.longitude = longitude;

coordinate2D.latitude = latitude;

MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:coordinate2D];

geoCoder.delegate = self;

[geoCoder start];

}

#pragma mark -

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark

{

NSString *subthroung=placemark.subThoroughfare;

NSString *local=placemark.locality;

NSLog(@"城市名:%@-%@-%@",placemark.locality,local,subthroung);

if (local) {

[cityLabel setText:local];

}

}

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error

{

}

@end