接第五步，当一个MKAnnotationView被点击后，会触发地图MKMapViewDelegate的方法

didSelectAnnotationView，点击空白处或其他的MKAnnotationView时，会触发

didDeselectAnnotationView，

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view NS_AVAILABLE(NA, 4_0);

- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view NS_AVAILABLE(NA, 4_0);

    我们可以利用这两个方法，在用户点击大头针时，弹出一个自定义的试图，对该地点进行标记说明，这个就是本次博文的内容了。

首先，修改下前面的CustomAnnotation这个类，添加一个type属性，用于标记类型，本次，我们用到了两种类别的Annotation，一个是用于展示大头针的，一个是展示大头针上弹出视图的：

////  CustomAnnotation.h//  LBS_002_mapview////  Created by liqun on 13-7-25.//  Copyright (c) 2013年 Block Cheng. All rights reserved.//#import 
    
     #import 
     
      #define PIN_RED @"Red"#define PIN_GREEN @"Green"#define PIN_PURPLE @"Purple"@interface CustomAnnotation : NSObject
      
       @property (nonatomic, assign, readonly)     CLLocationCoordinate2D coordinate;@property (nonatomic, copy, readonly)       NSString *title;@property (nonatomic, copy, readonly)       NSString *subtitle;@property (nonatomic, assign)int type;//0----pin  1---pop@property (nonatomic, unsafe_unretained) MKPinAnnotationColor pinColor;- (id) initWithCoordinates:(CLLocationCoordinate2D)paramCoordinates                     title:(NSString *)paramTitle                  subTitle:(NSString *)paramSubTitle;+ (NSString *) reusableIdentifierforPinColor :(MKPinAnnotationColor)paramColor;@end
      
     
    

////  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;}+ (NSString *) reusableIdentifierforPinColor :(MKPinAnnotationColor)paramColor{ NSString *result = nil;    switch (paramColor){        case MKPinAnnotationColorRed:{            result = PIN_RED;            break;        }        case MKPinAnnotationColorGreen:{            result = PIN_GREEN;            break;        }        case MKPinAnnotationColorPurple:{            result = PIN_PURPLE;            break;        }    }    return result;}@end

头文件

////  CustomAnnotationCell.h//  LBS_002_mapview////  Created by liqun on 13-7-29.//  Copyright (c) 2013年 Block Cheng. All rights reserved.//#import 
    
     @interface CustomAnnotationCell : UIView@property (nonatomic,retain)NSString* imageUrl;@property (nonatomic,copy)NSString* title;-(CustomAnnotationCell*)initWithTitle:(NSString*)ptitle WithImage:(NSString*)purl WithFrame:(CGRect)prt;@end
    

////  CustomAnnotationCell.m//  LBS_002_mapview////  Created by liqun on 13-7-29.//  Copyright (c) 2013年 Block Cheng. All rights reserved.//#import "CustomAnnotationCell.h"@implementation CustomAnnotationCell-(CustomAnnotationCell*)initWithTitle:(NSString*)ptitle WithImage:(NSString*)purl WithFrame:(CGRect)prt{    if (self = [super initWithFrame:prt]) {        self.title = ptitle;        self.imageUrl = purl;        UIImageView* imgeView = [[UIImageView alloc] initWithFrame:CGRectMake(5,5, self.frame.size.width * 0.3, self.frame.size.height - 10)];        imgeView.image = [UIImage imageNamed:purl];        [self addSubview:imgeView];        [imgeView release];                UILabel* titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(self.frame.size.width * 0.3 + 5, 5, self.frame.size.width - (self.frame.size.width * 0.3 + 5), self.frame.size.height - 10)];        titleLabel.text = ptitle;        titleLabel.numberOfLines = 2;       [titleLabel sizeToFit];        [self addSubview:titleLabel];        [titleLabel release];                            }        return self;}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    // Drawing code}*/@end

MKAnnotationView的子CustomMKAnnotationView上，前面说过，MKPinAnnotationView也是MKAnnotationView的子类，我们这次定义的这个CustomMKAnnotationView，和MKPinAnnotationView是一个级别的，可以作为

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation的返回视图，

头文件：

////  CustomMKAnnotationView.h//  LBS_002_mapview////  Created by liqun on 13-7-29.//  Copyright (c) 2013年 Block Cheng. All rights reserved.//#import 
    
     @interface CustomMKAnnotationView : MKAnnotationView@property (nonatomic,retain)UIView *contentView;- (id)initWithFrame:(CGRect)rct  Annotation:(id
     
      )annotation reuseIdentifier:(NSString *)reuseIdentifier;@end
     
    

////  CustomMKAnnotationView.m//  LBS_002_mapview////  Created by liqun on 13-7-29.//  Copyright (c) 2013年 Block Cheng. All rights reserved.//#import "CustomMKAnnotationView.h"#import 
    
     @interface CustomMKAnnotationView() {}-(void)drawBackground:(CGContextRef)context;- (void)drawArrowBoundPath:(CGContextRef)context;@end@implementation CustomMKAnnotationView@synthesize contentView;- (void)dealloc{    self.contentView = nil;    [super dealloc];}- (id)initWithFrame:(CGRect)rct  Annotation:(id
     
      )annotation reuseIdentifier:(NSString *)reuseIdentifier{    self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];    if (self) {        self.backgroundColor = [UIColor clearColor];        self.canShowCallout = NO;         self.frame = rct;        self.centerOffset = CGPointMake(0, -(self.frame.size.height/2.0 + 25));                       UIView *_contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height - 15)];        _contentView.backgroundColor   = [UIColor clearColor];                [self addSubview:_contentView];        [_contentView release];        self.contentView = _contentView;            }    return self;}-(void)drawBackground:(CGContextRef)context{    CGContextSetLineWidth(context, 2.0);    CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);    [self drawArrowBoundPath:context];    CGContextFillPath(context);    }- (void)drawArrowBoundPath:(CGContextRef)context{    CGRect rrect = self.bounds;	CGFloat radius = 6.0;    	CGFloat minx = CGRectGetMinX(rrect),    midx = CGRectGetMidX(rrect),    maxx = CGRectGetMaxX(rrect);	CGFloat miny = CGRectGetMinY(rrect),    maxy = CGRectGetMaxY(rrect)-15;    CGContextMoveToPoint(context, midx+15, maxy);    CGContextAddLineToPoint(context,midx, maxy+15);    CGContextAddLineToPoint(context,midx-15, maxy);        CGContextAddArcToPoint(context, minx, maxy, minx, miny, radius);    CGContextAddArcToPoint(context, minx, minx, maxx, miny, radius);    CGContextAddArcToPoint(context, maxx, miny, maxx, maxx, radius);    CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);    CGContextClosePath(context);}- (void)drawRect:(CGRect)rect{	[self drawBackground:UIGraphicsGetCurrentContext()];        self.layer.shadowColor = [[UIColor blackColor] CGColor];    self.layer.shadowOpacity = 1.0;    self.layer.shadowOffset = CGSizeMake(-0.5f, 0.5f);}@end
     
    

先把把type=0的大头针CustomAnnotation加到地图上，地图代理

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

返回要MKPinAnnotationView的视图，当用户选择这个MKPinAnnotationView时，我们再添加一个type=1的弹出视图CustomAnnotation，然后再在地图代理中返回我们自定义的CustomMKAnnotationView，再把那个包含有个UIImageView和Label的自定义视图加到这个CustomMKAnnotationView上，便能实现本次要达到的效果：

直接上主要实现逻辑的控制器ViewControlelr：

////  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 
    
     #import "CustomAnnotation.h"#import "CustomMKAnnotationView.h"#import "CustomAnnotationCell.h"@interface ViewController ()
     
      @property (nonatomic,retain)MKMapView* mapView;@property (nonatomic,retain)CLLocationManager* locationManager;@property (nonatomic,retain)CLLocation* location;@property (nonatomic, retain) CLGeocoder *myGeocoder;@property (nonatomic,retain)CustomMKAnnotationView* popMKAnnotation;@property (nonatomic,retain)CustomAnnotation* pinAnnotation;@property (nonatomic,retain)CustomAnnotation* popAnnotation;@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 {        NSLog(@"Location services are not enabled");    }        self.myGeocoder = [[CLGeocoder alloc] init];    }#pragma mark --#pragma mark --mapView delegate- (void)mapView:(MKMapView *)pmapView didSelectAnnotationView:(MKAnnotationView *)view NS_AVAILABLE(NA, 4_0){    NSLog(@"didSelectAnnotationView");    if ([view isKindOfClass:[MKPinAnnotationView class]]) {         NSLog(@"you have selected the pinView");        CustomAnnotation* annotation = (CustomAnnotation*)(view.annotation);        if (annotation.type == 0){            if (self.popAnnotation.coordinate.latitude == view.annotation.coordinate.latitude&&                self.popAnnotation.coordinate.longitude == view.annotation.coordinate.longitude) {                return;            }            if (self.popAnnotation) {                [pmapView removeAnnotation:self.popAnnotation];                self.popAnnotation = nil;            }                       CustomAnnotation* popAn = [[CustomAnnotation alloc] initWithCoordinates:CLLocationCoordinate2DMake(view.annotation.coordinate.latitude,view.annotation.coordinate.longitude) title:@"" subTitle:@""];            self.popAnnotation = popAn;            [popAn release];            self.popAnnotation.type = 1;            [pmapView addAnnotation:self.popAnnotation];            [pmapView setCenterCoordinate:self.popAnnotation.coordinate animated:YES];        }        	}else if ([view isKindOfClass:[CustomMKAnnotationView class]]){             NSLog(@"you have selected the popView");    }    }- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view NS_AVAILABLE(NA, 4_0){       NSLog(@"didDeselectAnnotationView %@ ---%@",view,[view.annotation class]);    if ([view isKindOfClass:[CustomMKAnnotationView class]]) {        NSLog(@"Unselected the popView");        if (self.popAnnotation.coordinate.latitude == view.annotation.coordinate.latitude&&            self.popAnnotation.coordinate.longitude == view.annotation.coordinate.longitude) {            NSLog(@"remove the pop view");            [mapView removeAnnotation:self.popAnnotation];            self.popAnnotation = nil;        }    } else if ([view isKindOfClass:[MKPinAnnotationView class]]) {        NSLog(@"Unselected the pinView");        if (self.popAnnotation &&  self.popAnnotation.coordinate.latitude == view.annotation.coordinate.latitude&&            self.popAnnotation.coordinate.longitude == view.annotation.coordinate.longitude) {            NSLog(@"remove the pop view");            [mapView removeAnnotation:self.popAnnotation];            self.popAnnotation = nil;        }            }    }- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id 
      
       )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;    //pinView    if (senderAnnotation.type == 0 ) {        /* 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 =        [CustomAnnotation reusableIdentifierforPinColor:senderAnnotation.pinColor];        /* 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:NO];            annotationView.draggable = YES;            annotationView.enabled = YES;                    }        /* Now make sure, whether we have reused a pin or created a new one,                  that the color of the pin matches the color of the annotation */        annotationView.pinColor = senderAnnotation.pinColor;        //自定义图片时，不能用drop        annotationView.animatesDrop = YES;//        annotationView.image = [UIImage imageNamed:@"pin"];        result = annotationView;    } else {//popView            NSString *popReusableIdentifier =@"popMKAnnotation";        /* Using the identifier we retrieved above, we will         attempt to reuse a pin in the sender Map View */        CustomMKAnnotationView *annotationView = (CustomMKAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier:popReusableIdentifier];        if (annotationView == nil){            /* If we fail to reuse a pin, then we will create one */            annotationView = [[CustomMKAnnotationView alloc] initWithFrame:CGRectMake(0, 0, 240, 80) Annotation:annotation reuseIdentifier:popReusableIdentifier];                                }        CustomAnnotationCell  *cell = [[CustomAnnotationCell alloc] initWithTitle:@"This is a test mapPopView,Whick is like a UITableViewCell" WithImage:@"color_3" WithFrame:CGRectMake(0, 0, annotationView.frame.size.width, annotationView.frame.size.height - 15)];        [annotationView.contentView addSubview:cell];        cell.userInteractionEnabled = YES;        [cell release];        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];        /* And eventually add it to the map */        annotation.pinColor = MKPinAnnotationColorPurple;        annotation.type = 0;        [self.mapView addAnnotation:annotation];        [annotation release];        self.pinAnnotation = annotation;    }else if (error == nil &&              [placemarks count] == 0){         NSLog(@"No results were returned.");     }else if (error != nil){         NSLog(@"An error occurred = %@", error);     }     }];}#pragma mark --#pragma mark --CCLocationManager delegate- (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;        self.myGeocoder = nil;    self.popMKAnnotation = nil;    self.pinAnnotation = nil;        self.popAnnotation = nil;        [super dealloc];}@end
      
     
    

运行效果图1：

点击大头针:

虽然丑了点，但意思到了。。。