显示苹果地图并添加标注

用到的类 CLGeocoder,用来将输入的地名编码为CLPlacemark，CLPlacemark封装了一地理信息

上代码

- (void)gencodeQuery :(NSString*)place
{
    CLGeocoder *geocoder = [[CLGeocoder alloc]init];
    //对地理位置进行编码
    [geocoder geocodeAddressString:place completionHandler:^(NSArray *placemarks,NSError *error){
    
    
        for (int i = 0; i != placemarks.count; ++i)
        {
            CLPlacemark *placemark = placemarks[i];
            
            //地图进行缩放，第一个参数是中心，第二个参数是南北跨度，第三个参数是东西跨度
            MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, 30000, 30000);
            [mapView setRegion:region];
            
            //在地图上添加标注，MapLocation是自定义类，实现了MKAnnotation协议
            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;
            //添加标注，添加后回回调MKMapViewDelegate的
            //- (MKAnnotationView*)mapView:(MKMapView *)parmMapView viewForAnnotation:(id<MKAnnotation>)annotation
            //自定义MapLocation的原因是addAnnotation接收id <MKAnnotation>参数
            [mapView addAnnotation:annotation];
            
        }
        
    }];
 
}
 
#pragma MKMapViewDelegate
 
- (MKAnnotationView*)mapView:(MKMapView *)parmMapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    MKPinAnnotationView *animationView = (MKPinAnnotationView*)[parmMapView dequeueReusableAnnotationViewWithIdentifier:@"T"];
    if(animationView == nil)
        animationView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"T"];
    animationView.pinColor = MKPinAnnotationColorGreen;//设置标注的颜色
    animationView.animatesDrop = YES;//设置动画
    animationView.canShowCallout = YES;//显示详细信息当点击标注的时候
 
    return animationView;
 
}
 
自定义的类
@interface MapLocation : NSObject<MKAnnotation>
 
@property(nonatomic,readwrite) CLLocationCoordinate2D coordinate;
@property(nonatomic,strong) NSString *streetAddress;
@property(nonatomic,strong) NSString *city;
@property(nonatomic,strong) NSString *state;
@property(nonatomic,strong) NSString *zip;
 
@end
 
－－－－－－－－－－－－－
 
@implementation MapLocation
 
- (NSString*)title
{
    return@"您的位置!";
}
- (NSString*)subtitle
{
    NSString *ret = @"";
    ret = [ret stringByAppendingString:self.state];
    ret = [ret stringByAppendingString:self.city];
    return ret;
}
 
@end