首页 / 移动开发 / IOS / iOS开发之离线地图核心代码

二，工程图。

三，代码。

ViewController.h

#import <UIKit/UIKit.h>#import <CoreLocation/CoreLocation.h>#import "MapLocation.h"@interface ViewController : UIViewController<MKMapViewDelegate>{MKMapView *_mapView;NSString *addressString;}@end 

 #import "ViewController.h"@interface ViewController （）@end@implementation ViewController- （void）viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.//调用系统自带的高德地图//显示当前某地的离线地图_mapView = [[MKMapView alloc] init];_mapView.frame = CGRectMake（0, 40, 320,400）;_mapView.delegate = self;_mapView.mapType = MKMapTypeStandard;[self.view addSubview:_mapView];addressString=@"光启城";NSLog（@"---addressString---%@",addressString）;[self geocodeQuery];}- （void）geocodeQuery{if （addressString == nil || [addressString length] == 0） {return;}CLGeocoder *geocoder = [[CLGeocoder alloc] init];[geocoder geocodeAddressString:addressString completionHandler:^（NSArray *placemarks, NSError *error） {NSLog（@"查询记录数：%ld",[placemarks count]）;if （[placemarks count] > 0） {[_mapView removeAnnotations:_mapView.annotations];}for （int i = 0; i < [placemarks count]; i++） {CLPlacemark* placemark = placemarks[i];//调整地图位置和缩放比例MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance（placemark.location.coordinate, 10000, 10000）;[_mapView setRegion:viewRegion animated:YES];MapLocation *annotation = [[MapLocation alloc] init];annotation.streetAddress = placemark.thoroughfare;annotation.city = placemark.locality;annotation.state = placemark.administrativeArea;annotation.zip = placemark.postalCode;annotation.coordinate = placemark.location.coordinate;[_mapView addAnnotation:annotation];}}];}#pragma mark Map View Delegate Methods- （MKAnnotationView *） mapView:（MKMapView *）theMapView viewForAnnotation:（id <MKAnnotation>） annotation {MKPinAnnotationView *annotationView= （MKPinAnnotationView *）[_mapView dequeueReusableAnnotationViewWithIdentifier:@"PIN_ANNOTATION"];if（annotationView == nil） {annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"PIN_ANNOTATION"];}annotationView.pinColor = MKPinAnnotationColorPurple;annotationView.animatesDrop = YES;annotationView.canShowCallout = YES;return annotationView;}- （void）mapView:（MKMapView *）mapView didUpdateUserLocation:（MKUserLocation *）userLocation{_mapView.centerCoordinate = userLocation.location.coordinate;}- （void）mapViewDidFailLoadingMap:（MKMapView *）theMapView withError:（NSError *）error {NSLog（@"error : %@",[error description]）;}@end 

#import <MapKit/MapKit.h>@interface MapLocation : NSObject<MKAnnotation>//街道信息属性@property （nonatomic, copy） NSString *streetAddress;//城市信息属性@property （nonatomic, copy） NSString *city;//州、省、市信息@property （nonatomic, copy） NSString *state;//邮编@property （nonatomic, copy） NSString *zip;//地理坐标@property （nonatomic, readwrite） CLLocationCoordinate2D coordinate;@end 

//地图调用函数#import "MapLocation.h"@implementation MapLocation- （NSString *）title {return @"您的位置！";}- （NSString *）subtitle {NSMutableString *ret = [NSMutableString new];if （_state）[ret appendString:_state];if （_city）[ret appendString:_city];if （_city && _state）[ret appendString:@", "];if （_streetAddress && （_city || _state || _zip））[ret appendString:@" • "];if （_streetAddress）[ret appendString:_streetAddress];if （_zip）[ret appendFormat:@", %@", _zip];return ret;}@end