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。
//
// testLocationViewController.m
// testLocation
//
// Created by laiqiang zhuo on 5/11/11.
// Copyright 2011 mtime. All rights reserved.
//
#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
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (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
