iOS_地图之显示附近微博

效果图：定位： 显示天安门附近微博：   自定义大头针： 

1、首先需要新建一个MKMapView地图对象，在storyBoard中拖拽一个，在工程中导入MapKit.framework；

2、遵守MKMapViewDelegate协议，设定显示地图的显示内容和范围；下面使用的为天安门的经纬度；注意因为中国的地图有偏移，所以在地图上会定位到天安门附近；

viewController的viewdidLoad方法中进行设定

 1 self.mapView.delegate = self;
 2     //116°23′29.29，经度
 3     double longitude = 116+23.0/60+29.29/60/60;
 4     //39°54′24.15，纬度
 5     double latitude = 39+54.0/60+24.15/60/60;
 6    // 注意region为结构体，不能直接赋值；
 7     MKCoordinateRegion region;
 8     region.center.longitude = longitude;
 9     region.center.latitude = latitude;
10     region.span.latitudeDelta = 0.005;
11     region.span.longitudeDelta = 0.005;
12
13     self.mapView.region = region;

3、创建大头针对象的类。只要遵守了 <MKAnnotation>协议的对象，实现[self.mapView addAnnotation:<#(id<MKAnnotation>)#>]即可作为大头针添加到地图上。新建一个WeiBo类来作为大头针对象；实现3个属性的getter方法，确定了大头针的标题描述和位置

weibo.m:

 1 #import <Foundation/Foundation.h>
 2 #import <MapKit/MapKit.h>
 3 @interface WeiBo : NSObject<MKAnnotation>
 4 @property (nonatomic, strong) NSString * userName;
 5 @property (nonatomic , strong) UIImage * userImage;
 6 @property (nonatomic , strong) NSString *text;
 7 /**
 8  *  latitude 纬度
 9     longitude 经度
10  */
11 @property (nonatomic , strong) NSDictionary * location;
12 @end
13 -(NSString *)title
14 {
15     returnself.userName;
16 }
17
18 -(NSString *)subtitle
19 {
20     returnself.text;
21 }
22
23 -(CLLocationCoordinate2D)coordinate
24 {
25     CLLocationCoordinate2D co2D;
26     double latitude = [self.location[@"latitude"] doubleValue];
27     double longitude = [self.location[@"longitude"] doubleValue];
28     co2D.latitude = latitude;
29     co2D.longitude = longitude;
30     return co2D;
31 }

4、新建一个manager类来获取数据,想新浪发送网络请求附近地点的微博,并把请求到的数据解析出来，赋值给weibo对象存到一个数组中返回；

manager.h:

 1 #import <Foundation/Foundation.h>
 2 #import "AFNetworking.h"
 3
 4 typedefvoid(^ReturnValueBlock)(NSArray * value);
 5
 6 @interface Manager : NSObject
 7
 8 + (instancetype)shared;
 9
10 - (void)requestNearbyWeiBoWithLat:(CGFloat)lattude
11                           andLong:(CGFloat)longitude
12                          andRange:(NSInteger)range
13                          andCount:(NSInteger)count
14                          andValue:(ReturnValueBlock)value;
15 @end

manager.m

 1 #define Token @"2.002PAyaD0jZRAv478009fa180Dydir"
 2 #define PlaceURL @"https://api.weibo.com/2/place/nearby_timeline.json"
 3 #import "Manager.h"
 4 #import "WeiBo.h"
 5
 6 @interfaceManager ()
 7
 8 @property (nonatomic, strong) AFHTTPRequestOperationManager * afManager;
 9
10 @end
11
12 @implementation Manager
13
14 + (instancetype)shared
15 {
16     staticManager * m = nil;
17     staticdispatch_once_t onceToken;
18     dispatch_once(&onceToken, ^{
19         m = [[Manageralloc] init];
20     });
21     return m;
22 }
23
24 - (instancetype)init
25 {
26     self = [superinit];
27     if (self) {
28         self.afManager = [[AFHTTPRequestOperationManageralloc] init];
29         self.afManager.responseSerializer = [AFHTTPResponseSerializerserializer];
30     }
31     returnself;
32 }
33
34 -(void)requestNearbyWeiBoWithLat:(CGFloat)lattude andLong:(CGFloat)longitude andRange:(NSInteger)range andCount:(NSInteger)count andValue:(ReturnValueBlock)value
35 {
36     NSDictionary * dic = @{@"access_token":Token,@"lat":@(lattude),@"long":@(longitude),@"count":@(count),@"range":@(range)};
37
38     [self.afManagerGET:PlaceURLparameters:dic success:^void(AFHTTPRequestOperation * op, NSData * data) {
39         NSDictionary * dicData = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingAllowFragmentserror:nil];
40         NSArray * arr = dicData[@"statuses"];
41         NSLog(@"请求结果：%ld",arr.count);
42         NSMutableArray * arrWeiBo = [NSMutableArrayarrayWithCapacity:arr.count];
43         for (NSDictionary * dic in arr)
44         {
45             WeiBo * weiBoObj = [selffetchWeiBoModelWithDic:dic];
46             [arrWeiBo addObject:weiBoObj];
47         }
48         value([NSArrayarrayWithArray:arrWeiBo]);
49
50     } failure:^void(AFHTTPRequestOperation * op, NSError * error)
51     {
52         NSLog(@"%@",error.localizedDescription);
53     }];
54
55 }
56
57 - (WeiBo *)fetchWeiBoModelWithDic:(NSDictionary *)dic
58 {
59     WeiBo * weibo = [[WeiBoalloc] init];
60     weibo.userName = dic[@"user"][@"name"];
61     weibo.text = dic[@"text"];
62     NSURL * imageURL = [NSURLURLWithString:dic[@"user"][@"profile_image_url"]];
63     NSData * data = [NSDatadataWithContentsOfURL:imageURL];
64     UIImage * image = [UIImageimageWithData:data];
65     weibo.userImage = image;
66
67     weibo.location = @{@"longitude":dic[@"geo"][@"coordinates"][1],@"latitude":dic[@"geo"][@"coordinates"][0]};
68     return weibo;
69 }

5、在viewController中请求微博数据，并在地图上显示；通过weibo中的3个getter方法就将数据传给大头针了；

1    [self.managerrequestNearbyWeiBoWithLat:latitude andLong:longitude andRange:200andCount:20andValue:^(NSArray *value) {
2         self.arrWeiBo = value;
3         for (WeiBo * wbObj in value)
4         {
5             WeiBo * wb = wbObj;
6             [self.mapViewaddAnnotation:wb];
7         }
8     }];

6、实现代理方法自定义大头针，显示用户头像；在vc中添加了一个int型成员变量 _count来更换用户头像；

 1 -(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
 2 {
 3     MKAnnotationView * view = [mapView dequeueReusableAnnotationViewWithIdentifier:@"wb"];
 4     if (view == nil)
 5     {
 6         view = [[MKAnnotationViewalloc] initWithAnnotation:annotation reuseIdentifier:@"wb"];
 7     }
 8     WeiBo * wb = self.arrWeiBo[_count];　　　　　使用了自己封装的一个方法来生成一个圆形带边框的头像；
 9     view.image = [UIImagegetCircleIconWithImage:wb.userImageandRadius:20andBorder:3andColor:[UIColorblueColor]];
10
11     UIImageView * imageV = [[UIImageViewalloc]initWithFrame:CGRectMake(0, 0, 30, 30)];
12     imageV.image = wb.userImage;
13     view.leftCalloutAccessoryView = imageV;
14     是否可以点击大头针显示详细信息；
15     view.canShowCallout = YES;
16     //[view setSelected:YES animated:NO];
17
18     _count ++;
19     return view;
20 }