【代码笔记】离线地图

一，效果图。

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

ViewController.m

#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];

    [email protected]"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

MapLocation.h

#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

MapLocation.m

//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