在之前的一篇博客-CoreLocation — iOS中的位置信息中, 简单描述了CoreLocation的使用, 并获取经纬度信息. 接下来, 将要从地理位置信息中反向解析出当前所在城市等信息.
首先, 初始化CLLocationManager对象, 设置delegate,
然后startUpdatingLocation即开始定位.
注意: 要继承CLLocationManagerDelegate协议.
<code class="hljs" bjectivec="">@property(strong, nonatomic) CLLocationManager *locationManager;#pragma mark - 获取当前定位城市- (void)locate { self.currentCity = [[NSString alloc] init]; // 判断是否开启定位 if ([CLLocationManager locationServicesEnabled]) { self.locationManager = [[CLLocationManager alloc] init]; self.locationManager.delegate = self; [self.locationManager startUpdatingLocation]; } else { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@home_cannot_locate, comment:@无法进行定位) message:NSLocalizedString(@home_cannot_locate_message, comment:@请检查您的设备是否开启定位功能) delegate:self cancelButtonTitle:NSLocalizedString(@common_confirm,comment:@确定) otherButtonTitles:nil, nil]; [alert show]; }}</code>然后, 实现didUpdateLocations方法, 并在其中解析出城市信息.
<code class="hljs" bjectivec="">#pragma mark - CoreLocation Delegate- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { CLLocation *currentLocation = [locations lastObject]; // 最后一个值为最新位置 CLGeocoder *geoCoder = [[CLGeocoder alloc] init]; // 根据经纬度反向得出位置城市信息 [geoCoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) { if (placemarks.count > 0) { CLPlacemark *placeMark = placemarks[0]; self.currentCity = placeMark.locality; // ? placeMark.locality : placeMark.administrativeArea; if (!self.currentCity) { self.currentCity = NSLocalizedString(@home_cannot_locate_city, comment:@无法定位当前城市); }// 获取城市信息后, 异步更新界面信息. dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ dispatch_async(dispatch_get_main_queue(), ^{ self.cityDict[@*] = @[self.currentCity]; [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationNone]; }); }); } else if (error == nil && placemarks.count == 0) { NSLog(@No location and error returned); } else if (error) { NSLog(@Location error: %@, error); } }]; [manager stopUpdatingLocation];}</code>结果如图: