如何使用地图的注解功能

//
//  RootViewController.m
//  MoreMapInfo
//
//  Copyright (c) 2014年 Y.X. All rights reserved.
//

#import "RootViewController.h"
#import <MapKit/MapKit.h>
#import "DisplayMap.h"
#import "LocationCoder.h"
#import "YXLocationManager.h"

@interface RootViewController ()<CLLocationManagerDelegate, MKMapViewDelegate>

@property (nonatomic, strong) MKMapView  *mapView;

@end

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [YXLocationManager getCurrentLocation:^(CLLocation *location, NSError *error) {
        if (error == nil)
        {
            // 将经纬度解析为地址
            LocationCoder *lCoder = [[LocationCoder alloc] initWithLocation:location];
            [lCoder startAnalyseLocation];
            lCoder.resultBlock = ^(NSArray *placemarks, NSError *error,
                                   LocationCoder *locationCoder)
            {
                NSLog(@"%@", locationCoder.addressLines);
            };
            
            //地图
            _mapView = [[MKMapView alloc]initWithFrame:self.view.bounds];
            _mapView.delegate          = self;
            _mapView.showsUserLocation = YES;
            _mapView.mapType           = MKMapTypeHybrid;
            _mapView.region = MKCoordinateRegionMake(location.coordinate,
                                                     MKCoordinateSpanMake(0.1, 0.1));
            
            //加入大头针
            DisplayMap *anno = [[DisplayMap alloc]initWithTitle:@"title"
                                                       SubTitle:@"subtitle"
                                                     Coordinate:CLLocationCoordinate2DMake(39.928168, 116.39328)];
            [_mapView addAnnotation:anno];
            [self.view addSubview:_mapView];
            
            //给地图添加长按手势,插上大头针
            UILongPressGestureRecognizer* longPress = \
            [[UILongPressGestureRecognizer alloc] initWithTarget:self
                                                          action:@selector(longPress:)];
            [_mapView addGestureRecognizer:longPress];
        }
        else
        {
            NSLog(@"%@", error);
        }
    }];
}

#pragma mark - viewDidLoad UILongPressGestureRecognize longPress:
- (void)longPress:(UILongPressGestureRecognizer*)longPress
{
    //长按一次 只在开始插入一次大头针   否则能用大头针写字。。。
    if (longPress.state == UIGestureRecognizerStateBegan)
    {
        CGPoint point = [longPress locationInView:_mapView];
        CLLocationCoordinate2D coordinate = [_mapView convertPoint:point
                                              toCoordinateFromView:_mapView];
        
        
        DisplayMap* an = [[DisplayMap alloc] initWithTitle:@"title"
                                                  SubTitle:@"subtitle"
                                                Coordinate:coordinate];
        [_mapView addAnnotation:an];
        
        [_mapView setCenterCoordinate:coordinate
                             animated:YES];
    }
}

#pragma mark - MKMapViewDelegate
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    //如果是所在地,跳过(固定写法)
    if ([annotation isKindOfClass:[mapView.userLocation class]])
    {
        return nil;
    }
    
    // 重用
    MKPinAnnotationView* pinView = (MKPinAnnotationView*)\
        [mapView dequeueReusableAnnotationViewWithIdentifier:@"ID"];
    if (pinView == nil)
    {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation
                                                  reuseIdentifier:@"ID"];
    }
    
    //能显示Call信息上面那些图字(很重要哦)
    pinView.canShowCallout = YES;
    
    //只有三种
    pinView.pinColor = MKPinAnnotationColorPurple;

    //显示动画 - 从天上落下
    pinView.animatesDrop = YES;
    
    pinView.image = [UIImage imageNamed:@"地图标点"];
    
    // 左侧CalloutAccessoryView(使用了自定义view)
    UIView* view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
    view.backgroundColor = [UIColor redColor];
    pinView.leftCalloutAccessoryView = view;
    
    // 右侧CalloutAccessoryView(使用了系统的按钮)
    UIButton* button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    pinView.rightCalloutAccessoryView = button;
    
    return pinView;
}

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSLog(@"点击事件");
}

@end