iOS map targeting uses several small features

There are many requirements that can be achieved with the iOS system's own location services. For example: Get current latitude and longitude, get current location information, and so on.

get current latitude and longitude

First import #import <corelocation/corelocation.h>, define Cllocationmanager instance, implement Cllocationmanagerdelegate.

@interface Viewcontroller () <cllocationmanagerdelegate>{    cllocationmanager *_locationmanager;} @end

How to start positioning:

-(void) startlocating{    if ([Cllocationmanager locationservicesenabled])    {        _locationmanager = [[ Cllocationmanager alloc] init];        Set the accuracy of positioning        [_locationmanager setdesiredaccuracy:kcllocationaccuracybest];        _locationmanager.distancefilter = 100.0f;        _locationmanager.delegate = self;        if ([[[[Uidevice Currentdevice] systemversion] floatvalue] > 8.0)        {            [_locationmanager Requestalwaysauthorization];            [_locationmanager requestwheninuseauthorization];        }        Start real-time positioning        [_locationmanager startupdatinglocation];}    }

To implement the Proxy method:

-(void) Locationmanager: (Cllocationmanager *) Manager didchangeauthorizationstatus: (clauthorizationstatus) status{    NSLog (@ "longitude =%f", manager.location.coordinate.longitude);    NSLog (@ "Latitude =%f", manager.location.coordinate.latitude);    [_locationmanager stopupdatinglocation];}

get Current Location information

In the proxy method above

-(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 (country) state  (city)  sublocality (district)            NSLog (@ "%@", [Test objectforkey:@ "country"]);            NSLog (@ "%@", [Test objectforkey:@ "State"]);            NSLog (@ "%@", [Test objectforkey:@ "sublocality"]);            NSLog (@ "%@", [Test objectforkey:@ "Street"]);}}    ];}

This makes it easy to get more information about the current location.

Get latitude and longitude of a certain place

-(void) Getlongitudeandlatitudewithcity: (NSString *) city{//city can be chinese 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).", (uns            igned 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); }    }];}

calculate the distance between two locations

-(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];//unit is m    return distance;}

First we can use the Getlongitudeandlatitudewithcity method above to obtain the latitude and longitude of a certain place. For example, we get Beijing and Shanghai latitude and longitude are: Beijing longitude = 116.405285,latitude = 39.904989 Shanghai longitude = 121.472644, Latitude = 31.231706, then Beijing and Shanghai The distance between the two is:

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

The approximate distance is calculated, and may not be so precise. Enter the result:

Distance = 1066449.749194

Code: Https://github.com/worldligang/MapDistanceMaster.git

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iOS map targeting uses several small features