about how to call the Apple's own map app

Clgeocoder *geocoder = [[Clgeocoder alloc] init];

By geocoding, you get the location,

Cllocation *loc = [[Cllocation alloc] initwithlatitude:30.662221 longitude:104.041367];

[GeoCoder reversegeocodelocation:loc completionhandler:^ (Nsarray *placemarks, Nserror *error) {

Clplacemark *pmark = [Placemarks firstobject];

NSData *data = [Nsjsonserialization dataWithJSONObject:pMark.addressDictionary options:nsjsonwritingprettyprinted Error:nil];

NSString *result = [[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding];

NSLog (@ "%@", result);

Mkplacemark *mkmark = [[Mkplacemark alloc] initwithplacemark:pmark];

Set the format of the map, satellite map, standard map, etc.

Nsdictionary *options = @{mklaunchoptionsmaptypekey:@ (Mkmaptypestandard)};

Mkmapitem *mapitem = [[Mkmapitem alloc] initwithplacemark:mkmark];

Call the function and show the map.

[Mapitem openinmapswithlaunchoptions:options];

}];

about how to call the Apple's own map app