iOS地图定位使用几个小功能

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iOS地图定位使用几个小功能

iOS开发

iOS系统自带的定位服务可以实现很多需求。比如：获取当前经纬度，获取当前位置信息等等。

获取当前经纬度

首先导入#import <CoreLocation/CoreLocation.h>，定义CLLocationManager的实例，实现CLLocationManagerDelegate。

@interface ViewController ()<CLLocationManagerDelegate>
{
CLLocationManager *_locationManager;
}

@end

开始定位的方法：

- (void)startLocating
{
if([CLLocationManager locationServicesEnabled])
{
_locationManager = [[CLLocationManager alloc] init];
//设置定位的精度
[_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
_locationManager.distanceFilter = 100.0f;
_locationManager.delegate = self;
if ([[[UIDevice currentDevice] systemVersion] floatValue] > 8.0)
{
[_locationManager requestAlwaysAuthorization];
[_locationManager requestWhenInUseAuthorization];
}
//开始实时定位
[_locationManager startUpdatingLocation];
}
}

实现代理方法：

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
NSLog(@"Longitude = %f", manager.location.coordinate.longitude);
NSLog(@"Latitude = %f", manager.location.coordinate.latitude);
[_locationManager stopUpdatingLocation];
}

获取当前位置信息

在上面的代理方法中

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
NSLog(@"Longitude = %f", manager.location.coordinate.longitude);
NSLog(@"Latitude = %f", manager.location.coordinate.latitude);
[_locationManager stopUpdatingLocation];

CLGeocoder * geoCoder = [[CLGeocoder alloc] init];
[geoCoder reverseGeocodeLocation:manager.location completionHandler:^(NSArray *placemarks, NSError *error) {
for (CLPlacemark * placemark in placemarks) {
NSDictionary *test = [placemark addressDictionary];
// Country(国家) State(城市) SubLocality(区)
NSLog(@"%@", [test objectForKey:@"Country"]);
NSLog(@"%@", [test objectForKey:@"State"]);
NSLog(@"%@", [test objectForKey:@"SubLocality"]);
NSLog(@"%@", [test objectForKey:@"Street"]);
}
}];

}

这样就很简单获取了当前位置的详细信息。

获取某一个地点的经纬度

- (void)getLongitudeAndLatitudeWithCity:(NSString *)city
{
//city可以为中文
NSString *oreillyAddress = city;
CLGeocoder *myGeocoder = [[CLGeocoder alloc] init];
[myGeocoder geocodeAddressString:oreillyAddress completionHandler:^(NSArray *placemarks, NSError *error) {
if ([placemarks count] > 0 && error == nil)
{
NSLog(@"Found %lu placemark(s).", (unsigned long)[placemarks count]);
CLPlacemark *firstPlacemark = [placemarks objectAtIndex:0];
NSLog(@"Longitude = %f", firstPlacemark.location.coordinate.longitude);
NSLog(@"Latitude = %f", firstPlacemark.location.coordinate.latitude);
}
else if ([placemarks count] == 0 && error == nil)
{
NSLog(@"Found no placemarks.");
}
else if (error != nil)
{
NSLog(@"An error occurred = %@", error);
}
}];
}

计算两个地点之间的距离

- (double)distanceByLongitude:(double)longitude1 latitude:(double)latitude1 longitude:(double)longitude2 latitude:(double)latitude2{
CLLocation* curLocation = [[CLLocation alloc] initWithLatitude:latitude1 longitude:longitude1];
CLLocation* otherLocation = [[CLLocation alloc] initWithLatitude:latitude2 longitude:longitude2];
double distance = [curLocation distanceFromLocation:otherLocation];//单位是m
return distance;
}

首先我们可以用上面的getLongitudeAndLatitudeWithCity方法获取某一个地点的经纬度。（有问题可以关注微信iOS开发：iOSDevTip）比如我们获取北京和上海的经纬度分别为：北京Longitude = 116.405285，Latitude = 39.904989 上海Longitude = 121.472644， Latitude = 31.231706, 那么北京和上海之间的距离就是：

double distance = [self distanceByLongitude:116.405285 latitude:39.904989 longitude:121.472644 latitude:31.231706];
NSLog(@"Latitude = %f", distance);

计算的是大概的距离，可能没有那么精准。输入结果为：

distance = 1066449.749194

代码下载地址: https://github.com/worldligang/MapDistanceMaster.git

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