地理编码（根据地址得出位置并且加上自定义的大头针）

NSLocationWhenInUseUsageDescription  YES；
NSLocationAlwaysUsageDescription YES；

//
//  MapViewController.m
//  地图test
//
//  Created by administrator on 15/8/27.
//  Copyright (c) 2015年 gengcong. All rights reserved.
//

#import "MapViewController.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "Customannotation.h"
@interface MapViewController ()<MKMapViewDelegate,CLLocationManagerDelegate>
{
CLLocationManager *_locationmanger;
MKMapView *_mapView;
CLGeocoder *_geocoder;
double _latitude;
double _longitude;
}

@end

@implementation MapViewController

- (void)viewDidLoad {
[super viewDidLoad];
_geocoder =[[CLGeocoder alloc]init];
_mapView =[[MKMapView alloc]init];
_mapView.frame=self.view.frame;
[self.view addSubview:_mapView];

//    设置代理
_mapView.delegate=self;
_mapView.mapType=MKMapTypeStandard;
[self getCoordinateByAddress:self.aaa];

// Do any additional setup after loading the view.
}
//longitude经度
//laititude纬度
-(void)addannotation:(double)longitude  latitude:(double)latitude address:(NSString*)address
{
CLLocationCoordinate2D location1=CLLocationCoordinate2DMake(latitude, longitude);
Customannotation *annotation1=[[Customannotation alloc]init];
annotation1.title=address;
annotation1.subtitle=[NSString stringWithFormat:@"上有天堂，下有%@",address];
annotation1.coordinate=location1;
annotation1.image = [UIImage imageNamed:@"marker"];
[_mapView addAnnotation:annotation1];
[_mapView setRegion:MKCoordinateRegionMake(annotation1.coordinate,
//移动地图到一个区域，这个区域的中心点annotation2，比例尺（.03, .03）
MKCoordinateSpanMake(.03, .03)) animated:YES];

}

-(void)getCoordinateByAddress:(NSString *)address
{
[_geocoder geocodeAddressString:address completionHandler:^(NSArray *placemarks, NSError *error) {
CLPlacemark *placemark=[placemarks firstObject];
//定义一个location存放
CLLocation *location=placemark.location;//位置
//    CLRegion *region=placemark.region;//区域
//    获取经纬度
_latitude=location.coordinate.latitude;
_longitude=location.coordinate.longitude;

//    NSDictionary *addressDic=placemark.addressDictionary;

//添加大头针
[self addannotation:_longitude latitude:_latitude address:address];

}];

}

#pragma mark - 地图控件代理方法
#pragma mark 显示大头针时调用，注意方法中的annotation参数是即将显示的大头针对象
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
//由于当前位置的标注也是一个大头针，所以此时需要判断，此代理方法返回nil使用默认大头针视图
if ([annotation isKindOfClass:[Customannotation class]]) {
static NSString *key1=@"AnnotationKey1";

//创建标注视图
MKAnnotationView *annotationView=[_mapView dequeueReusableAnnotationViewWithIdentifier:key1];

//如果缓存池中不存在则新建
if (!annotationView) {
annotationView=[[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:key1];
annotationView.canShowCallout=true;//允许交互点击
annotationView.calloutOffset=CGPointMake(0, 1);//定义详情视图偏移量
annotationView.leftCalloutAccessoryView=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"cafe.png"]];//定义详情左侧视图
}

//修改大头针视图
//重新设置此类大头针视图的大头针模型(因为有可能是从缓存池中取出来的，位置是放到缓存池时的位置)
annotationView.annotation=annotation;
annotationView.image=((Customannotation *)annotation).image;//设置大头针视图的图片

return annotationView;
}else {
return nil;
}
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

@end

//
//  Customannotation.h
//  地图test
//
//  Created by administrator on 15/8/27.
//  Copyright (c) 2015年 gengcong. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface Customannotation : NSObject<MKAnnotation>

@property(nonatomic)CLLocationCoordinate2D coordinate;
@property(nonatomic,copy) NSString *title;
@property(nonatomic,copy) NSString *subtitle;

@property(nonatomic,strong)UIImage *image;
@end