iOS_地图之显示附近微博

     

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

 self.mapView.delegate = self;
     //116°23′29.29，经度
     double longitude = +23.0/+29.29//;
     //39°54′24.15，纬度
     double latitude = +54.0/+24.15//;
    // 注意region为结构体，不能直接赋值；
     MKCoordinateRegion region;
     region.center.longitude = longitude;
     region.center.latitude = latitude;
     region.span.latitudeDelta = 0.005;
     region.span.longitudeDelta = 0.005;

     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:

 #import <Foundation/Foundation.h>
 #import <MapKit/MapKit.h>
 @interface WeiBo : NSObject<MKAnnotation>
 @property (nonatomic, strong) NSString * userName;
 @property (nonatomic , strong) UIImage * userImage;
 @property (nonatomic , strong) NSString *text;
 /**
  *  latitude 纬度
     longitude 经度
  */
 @property (nonatomic , strong) NSDictionary * location;
 @end
 -(NSString *)title
 {
     returnself.userName;
 }

 -(NSString *)subtitle
 {
     returnself.text;
 }

 -(CLLocationCoordinate2D)coordinate
 {
     CLLocationCoordinate2D co2D;
     double latitude = [self.location[@"latitude"] doubleValue];
     double longitude = [self.location[@"longitude"] doubleValue];
     co2D.latitude = latitude;
     co2D.longitude = longitude;
     return co2D;
 }

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:

 #import <Foundation/Foundation.h>
 #import "AFNetworking.h"

 typedefvoid(^ReturnValueBlock)(NSArray * value);

 @interface Manager : NSObject

 + (instancetype)shared;

 - (void)requestNearbyWeiBoWithLat:(CGFloat)lattude
                           andLong:(CGFloat)longitude
                          andRange:(NSInteger)range
                          andCount:(NSInteger)count
                          andValue:(ReturnValueBlock)value;
 @end

manager.m

 #define Token @"2.002PAyaD0jZRAv478009fa180Dydir"
 #define PlaceURL @"https://api.weibo.com/2/place/nearby_timeline.json"
 #import "Manager.h"
 #import "WeiBo.h"

 @interfaceManager ()

 @property (nonatomic, strong) AFHTTPRequestOperationManager * afManager;

 @end

 @implementation Manager

 + (instancetype)shared
 {
     staticManager * m = nil;
     staticdispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
         m = [[Manageralloc] init];
     });
     return m;
 }

 - (instancetype)init
 {
     self = [superinit];
     if (self) {
         self.afManager = [[AFHTTPRequestOperationManageralloc] init];
         self.afManager.responseSerializer = [AFHTTPResponseSerializerserializer];
     }
     returnself;
 }

 -(void)requestNearbyWeiBoWithLat:(CGFloat)lattude andLong:(CGFloat)longitude andRange:(NSInteger)range andCount:(NSInteger)count andValue:(ReturnValueBlock)value
 {
     NSDictionary * dic = @{@"access_token":Token,@"lat":@(lattude),@"long":@(longitude),@"count":@(count),@"range":@(range)};

     [self.afManagerGET:PlaceURLparameters:dic success:^void(AFHTTPRequestOperation * op, NSData * data) {
         NSDictionary * dicData = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingAllowFragmentserror:nil];
         NSArray * arr = dicData[@"statuses"];
         NSLog(@"请求结果：%ld",arr.count);
         NSMutableArray * arrWeiBo = [NSMutableArrayarrayWithCapacity:arr.count];
         for (NSDictionary * dic in arr)
         {
             WeiBo * weiBoObj = [selffetchWeiBoModelWithDic:dic];
             [arrWeiBo addObject:weiBoObj];
         }
         value([NSArrayarrayWithArray:arrWeiBo]);

     } failure:^void(AFHTTPRequestOperation * op, NSError * error)
     {
         NSLog(@"%@",error.localizedDescription);
     }];

 }

 - (WeiBo *)fetchWeiBoModelWithDic:(NSDictionary *)dic
 {
     WeiBo * weibo = [[WeiBoalloc] init];
     weibo.userName = dic[@"user"][@"name"];
     weibo.text = dic[@"text"];
     NSURL * imageURL = [NSURLURLWithString:dic[@"user"][@"profile_image_url"]];
     NSData * data = [NSDatadataWithContentsOfURL:imageURL];
     UIImage * image = [UIImageimageWithData:data];
     weibo.userImage = image;

     weibo.location = @{@"longitude":dic[@"geo"][@"coordinates"][],@"latitude":dic[@"geo"][@"coordinates"][]};
     return weibo;
 }

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；

    [self.managerrequestNearbyWeiBoWithLat:latitude andLong:longitude andRange:200andCount:20andValue:^(NSArray *value) {
         self.arrWeiBo = value;
         for (WeiBo * wbObj in value)
         {
             WeiBo * wb = wbObj;
             [self.mapViewaddAnnotation:wb];
         }
     }];

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；

 -(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
 {
     MKAnnotationView * view = [mapView dequeueReusableAnnotationViewWithIdentifier:@"wb"];
     if (view == nil)
     {
         view = [[MKAnnotationViewalloc] initWithAnnotation:annotation reuseIdentifier:@"wb"];
     }
     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；
     view.image = [UIImagegetCircleIconWithImage:wb.userImageandRadius:20andBorder:3andColor:[UIColorblueColor]];

     UIImageView * imageV = [[UIImageViewalloc]initWithFrame:CGRectMake(, , , )];
     imageV.image = wb.userImage;
     view.leftCalloutAccessoryView = imageV;
     是否可以点击大头针显示详细信息；
     view.canShowCallout = YES;
     //[view setSelected:YES animated:NO];

     _count ++;
     return view;
 }