序言
在我们生活周围的应用中经?？吹秸庋南窒缶褪怯幸桓龉潭ǖ拇笸氛朐诘赝贾行模缓笠贫赝嫉氖焙?，地址会发生变化，例如我们平常用的应用小黄车ofo，膜拜，小蓝单车等，都是在地图的中心固定一个大头针，当移动地图的时候就刷新周边的数据。
思路
这其实不是一个真正的大头针，其实是一个自定义的视图。一个图片添加到地图中心，然后在mapView拖动地图的代理方法中，去翻解析根据定位坐标，进行周边搜索。
示例代码
1、添加地图
self.mapView = [[MAMapView alloc] initWithFrame:CGRectMake(20, 64 + 100, self.view.frame.size.width - 40, self.view.frame.size.height - 64 - 150)];
self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.mapView.delegate = self;
self.mapView.mapType = MAMapTypeStandard;
// 禁止旋转
self.mapView.rotateEnabled = NO;
// 禁止立体旋转
self.mapView.rotateCameraEnabled = NO;
self.mapView.showsBuildings = NO;
self.mapView.showsCompass = YES;
self.mapView.showsUserLocation = YES;
self.mapView.userTrackingMode = MAUserTrackingModeFollow;
[self.view addSubview:self.mapView];
// 初始化搜索
self.searchAPI = [[AMapSearchAPI alloc] init];
self.searchAPI.delegate = self;
#pragma mark--创建假的大头针
- (void)creatPinView {
self.pinView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 48, 48)];
self.pinView.image = [UIImage imageNamed:@"mapimage"];
self.pinView.center = CGPointMake((self.view.frame.size.width - 40) * 0.5, (self.view.frame.size.height - 64 - 150) * 0.5);
self.pinView.hidden = NO;
[self.mapView addSubview:self.pinView];
}
2、创建地址显示标签
#pragma mark--creatPostionLabel
- (void)creatPostionLabel {
self.positonLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 64 + 20, self.view.frame.size.width - 40, 60)];
self.positonLabel.font = [UIFont systemFontOfSize:15];
self.positonLabel.textColor = [UIColor cyanColor];
self.positonLabel.backgroundColor = [UIColor grayColor];
self.positonLabel.numberOfLines = 2;
[self.view addSubview:self.positonLabel];
}
3、进行单次逆地理定位查出当前位置
-(void)configLocationManager {
self.locationManager = [[AMapLocationManager alloc] init];
[self.locationManager setDelegate:self];
//设置期望定位精度
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyHundredMeters];
//设置不允许系统暂停定位
[self.locationManager setPausesLocationUpdatesAutomatically:NO];
//设置允许在后台定位
[self.locationManager setAllowsBackgroundLocationUpdates:YES];
//设置定位超时时间
[self.locationManager setLocationTimeout:DefaultLocationTimeout];
//设置逆地理超时时间
[self.locationManager setReGeocodeTimeout:DefaultReGeocodeTimeout];
//设置开启虚拟定位风险监测，可以根据需要开启
[self.locationManager setDetectRiskOfFakeLocation:NO];
//进行单次带逆地理定位请求
[self.locationManager requestLocationWithReGeocode:YES completionBlock:self.completionBlock];
[self.mapView setZoomLevel:17.5];
}
4、显示当前的位置
#pragma mark - Initialization
- (void)initCompleteBlock {
__weak ShowPostionViewController *weakSelf = self;
self.completionBlock = ^(CLLocation *location, AMapLocationReGeocode *regeocode, NSError *error) {
if (error != nil && error.code == AMapLocationErrorLocateFailed) {
//定位错误：此时location和regeocode没有返回值，不进行annotation的添加
// 重新进行,单次定位
[weakSelf.locationManager requestLocationWithReGeocode:YES completionBlock:weakSelf.completionBlock];
NSLog(@"定位错误:{%ld - %@};", (long)error.code, error.userInfo);
return;
} else if (error != nil
&& (error.code == AMapLocationErrorReGeocodeFailed
|| error.code == AMapLocationErrorTimeOut
|| error.code == AMapLocationErrorCannotFindHost
|| error.code == AMapLocationErrorBadURL
|| error.code == AMapLocationErrorNotConnectedToInternet
|| error.code == AMapLocationErrorCannotConnectToHost))
{
//逆地理错误：在带逆地理的单次定位中，逆地理过程可能发生错误，此时location有返回值，regeocode无返回值，进行annotation的添加
NSLog(@"逆地理错误:{%ld - %@};", (long)error.code, error.userInfo);
// 重新进行,单次定位
[weakSelf.locationManager requestLocationWithReGeocode:YES completionBlock:weakSelf.completionBlock];
} else if (error != nil && error.code == AMapLocationErrorRiskOfFakeLocation) {
//存在虚拟定位的风险：此时location和regeocode没有返回值，不进行annotation的添加
NSLog(@"存在虚拟定位的风险:{%ld - %@};", (long)error.code, error.userInfo);
return;
} else {
//没有错误：location有返回值，regeocode是否有返回值取决于是否进行逆地理操作，进行annotation的添加
}
//有无逆地理信息，annotationView的标题显示的字段不一样
if (regeocode) {
weakSelf.positonLabel.text = [NSString stringWithFormat:@"%@", regeocode.formattedAddress];
weakSelf.location = location;
} else {
}
};
}
5、在mapView被拖动时，更新位置发起翻解析搜索请求
#pragma mark--移动地图的时候点击事件
- (void)mapView:(MAMapView *)mapView mapDidMoveByUser:(BOOL)wasUserAction {
if (!wasUserAction) {
return;
}
CGPoint center = CGPointMake(self.mapView.bounds.size.width * 0.5, self.mapView.bounds.size.height * 0.5);
CLLocationCoordinate2D coor2d = [mapView convertPoint:center toCoordinateFromView:self.mapView];
self.lastLocation = coor2d;
// ReGEO解析
AMapReGeocodeSearchRequest *request = [[AMapReGeocodeSearchRequest alloc] init];
request.location = [AMapGeoPoint locationWithLatitude:coor2d.latitude longitude:coor2d.longitude];
[self.searchAPI AMapReGoecodeSearch:request];
}
6、更新位置
- (void)onReGeocodeSearchDone:(AMapReGeocodeSearchRequest *)request response:(AMapReGeocodeSearchResponse *)response {
NSString *address = response.regeocode.formattedAddress;
self.positonLabel.text = address;
// 定位结果
NSLog(@"location:{lat:%f; lon:%f}", request.location.latitude, request.location.longitude);
self.pinView.hidden = NO;
[self.mapView setCenterCoordinate:self.lastLocation animated:YES];
}
案例demo如下：
https://github.com/Wululu6/MapKitDemo1.git
参考内容：
http://08643.cn/p/0cd5260153c9
http://08643.cn/p/2ede1fc70fe2
查看地图更多内容请点击以下链接：
定位
