[IOS地图开发系类]4、MKMapview上添加MKAnnotationView，标记当前位置

  在第三步的基础上，让ViewController实现地图的协议

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation

该协议方法类似于UITableView的 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath这个方法，用于返回注解视图。

MKMapViewDelegate，并设置地图MKMapView的代理为该ViewControlelr，

self.mapView.delegate = self;

编译一个实现地图注解协议 MKAnnotation的类，如下：

CustomAnnotation.h

//
//  CustomAnnotation.h
//  LBS_002_mapview
//
//  Created by liqun on 13-7-25.
//  Copyright (c) 2013年 Block Cheng. All rights reserved.
//

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

@interface CustomAnnotation : NSObject<MKAnnotation>

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

- (id) initWithCoordinates:(CLLocationCoordinate2D)paramCoordinates
                     title:(NSString *)paramTitle
                  subTitle:(NSString *)paramSubTitle;

@end

CustomAnnotation.m

//
//  CustomAnnotation.m
//  LBS_002_mapview
//
//  Created by liqun on 13-7-25.
//  Copyright (c) 2013年 Block Cheng. All rights reserved.
//

#import "CustomAnnotation.h"

@implementation CustomAnnotation

- (void)dealloc
{
    [_subtitle  release];
    [_title  release];
    
    [super dealloc];
}
- (id) initWithCoordinates:(CLLocationCoordinate2D)paramCoordinates
                     title:(NSString *)paramTitle
                  subTitle:(NSString *)paramSubTitle
{

    if (self = [super init]) {
        _coordinate = paramCoordinates;
        _title = [paramTitle copy];
        _subtitle = [paramSubTitle copy];
    }

    return self;
}


@end

控制器实现文件的如下：

//
//  ViewController.m
//  LBS_002_mapview
//
//  Created by liqun on 13-7-25.
//  Copyright (c) 2013年 Block Cheng. All rights reserved.
//

#import "ViewController.h"
#import <MapKit/MapKit.h>
#import "CustomAnnotation.h"

@interface ViewController ()<CLLocationManagerDelegate,MKMapViewDelegate>
@property (nonatomic,retain)MKMapView* mapView;
@property (nonatomic,retain)CLLocationManager* locationManager;
@property (nonatomic,retain)CLLocation* location;
@property (nonatomic, retain) CLGeocoder *myGeocoder;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    MKMapView* map = [[MKMapView alloc] initWithFrame:self.view.frame];
    map.mapType = MKMapTypeStandard;
    map.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [self.view addSubview:map];
    [map release];
    self.mapView = map;
    self.mapView.delegate = self;
    
    UIButton *addBt = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    addBt.frame = CGRectMake(0, 00, 320, 50);
    [addBt setTitle:@"locationMe" forState:UIControlStateNormal];
   
    [ addBt addTarget:self action:@selector(handleLocationMe:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview: addBt];
    
    if ([CLLocationManager locationServicesEnabled]){
        self.locationManager = [[CLLocationManager alloc] init];
        self.locationManager.delegate = self;
        self.locationManager.purpose =
        @"To provide functionality based on user's current location.";
        [self.locationManager startUpdatingLocation];
    } else {
        /* Location services are not enabled.
         Take appropriate action: for instance, prompt the user to enable location services */
        NSLog(@"Location services are not enabled");
    }
    
    self.myGeocoder = [[CLGeocoder alloc] init];
    
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView *result = nil;
    if ([annotation isKindOfClass:[CustomAnnotation class]] == NO){
        return result;
    }
    if ([mapView isEqual:self.mapView] == NO){
        /* We want to process this event only for the Map View
         that we have created previously */
        return result;
    }
    /* First, typecast the annotation for which the Map View has
     fired this delegate message */
    CustomAnnotation *senderAnnotation = (CustomAnnotation *)annotation;
    /* Using the class method we have defined in our custom
     annotation class, we will attempt to get a reusable
     identifier for the pin we are about
     to create */
    NSString *pinReusableIdentifier =@"cn.live@helloclq";
    /* Using the identifier we retrieved above, we will
     attempt to reuse a pin in the sender Map View */
    MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier:pinReusableIdentifier];
    if (annotationView == nil){
        /* If we fail to reuse a pin, then we will create one */
        annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:senderAnnotation reuseIdentifier:pinReusableIdentifier];
        /* Make sure we can see the callouts on top of
         each pin in case we have assigned title and/or
         subtitle to each pin */
        [annotationView setCanShowCallout:YES];
        annotationView.draggable = YES;
//        annotationView.enabled = YES;
        
    }
    
    //自定义图片时，不能用drop
    annotationView.animatesDrop = YES;
//    UIImage *img =  [UIImage imageNamed:@"color_3.png"];
//    annotationView.image = img;
    result = annotationView;
    return result;
}

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

-(IBAction)handleLocationMe:(id)sender
{    
    [self.myGeocoder
     reverseGeocodeLocation:self.location completionHandler:^(NSArray *placemarks, NSError *error) {
         if (error == nil &&[placemarks count] > 0){
        CLPlacemark *placemark = [placemarks objectAtIndex:0];
        /* We received the results */
        NSLog(@"Country = %@", placemark.country);
        NSLog(@"Postal Code = %@", placemark.postalCode);
        NSLog(@"Locality = %@", placemark.locality);
             NSLog(@"dic = %@", placemark.addressDictionary );
        NSLog(@"dic FormattedAddressLines= %@", [placemark.addressDictionary objectForKey:@"FormattedAddressLines"]);
             NSLog(@"dic Name = %@", [placemark.addressDictionary objectForKey:@"Name"]);
             NSLog(@"dic State = %@", [placemark.addressDictionary objectForKey:@"State"]);
             NSLog(@"dic Street = %@", [placemark.addressDictionary objectForKey:@"Street"]);
             NSLog(@"dic SubLocality= %@", [placemark.addressDictionary objectForKey:@"SubLocality"]);
             NSLog(@"dic SubThoroughfare= %@", [placemark.addressDictionary objectForKey:@"SubThoroughfare"]);
             NSLog(@"dic Thoroughfare = %@", [placemark.addressDictionary objectForKey:@"Thoroughfare"]);
             
        
        CLLocationCoordinate2D location =
        CLLocationCoordinate2DMake(self.location.coordinate.latitude, self.location.coordinate.longitude);
        /* Create the annotation using the location */
        
        CustomAnnotation *annotation =[[CustomAnnotation alloc] initWithCoordinates:location title:placemark.name subTitle:placemark.thoroughfare];
       
        [self.mapView addAnnotation:annotation];
        [annotation release];
        
    }
     else if (error == nil &&
              [placemarks count] == 0){
         NSLog(@"No results were returned.");
     }
     else if (error != nil){
         NSLog(@"An error occurred = %@", error);
     }
     }];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    /* We received the new location */
    NSLog(@"Latitude = %f", newLocation.coordinate.latitude);
    NSLog(@"Longitude = %f", newLocation.coordinate.longitude);
    self.location = newLocation;
    
    
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    /* Failed to receive user's location */
}


- (void)dealloc
{
    self.mapView = nil;
    self.location = nil;
    self.locationManager = nil;
    
    [super dealloc];
}

@end

运行后，点击按钮，效果如下：

点击该注解：