IOS地图及定位使用

1.定位

定位使用CoreLocation库，引入CoreLocation/CoreLocation。创建CLLocationManager对象，使用startUpdatingLocation方法开始更新位置信息。

_mgr = [[CLLocationManager alloc] init];
[_mgr requestWhenInUseAuthorization];
_mgr.delegate = self;
[_mgr startUpdatingLocation];

更新成功后，会调用CLLocationManagerDelegate的代理方法

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation *location = [locations objectAtIndex:locations.count - ];
NSLog(@"%f,%f\n",location.coordinate.latitude,location.coordinate.longitude);
}

如果要停止更新，调用stopUpdatingLocation即可。

PS1:如果启动时提示是否打开定位，需要调用CLLocationManager对象的requestWhenInUseAuthorization。

PS2:定位用途的提示，在info.plist中添加NSLocationWhenInUseUsageDescription、NSLocationAlwaysUsageDescription添加提示

2.坐标与城市的转换

使用CLGeocoder的

geocodeAddressString将地址转换为CLPlacemark（包含坐标、城市信息等内容），如

CLGeocoder *coder = [[CLGeocoder alloc] init];
[coder geocodeAddressString:@"青岛" completionHandler:^(NSArray *placemarks, NSError *error) {
        for (int i = ; i < placemarks.count; i++) {
            CLPlacemark *placemark = [placemarks objectAtIndex:i];
            NSLog(@"%@,%@",placemark.locality,placemark.country);
        }
}];

或reverseGeocodeLocation将坐标转换为CLPlacemark，如

CLGeocoder *geo = [[CLGeocoder alloc] init];
[geo reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error){
        CLPlacemark *placemark = [placemarks objectAtIndex:];
        NSLog(placemark.locality);
}];

3.标记（大头针）

大头针要实现MKAnnotation协议，设置其中的coordinate（坐标）、title（标题）、subtitle（副标题）后，用mapview的addAnnotation方法即可添加到地图上，如

@interface MKAnno : NSObject<MKAnnotation>

@property (nonatomic,assign) CLLocationCoordinate2D coordinate;

// Title and subtitle for use by selection UI.
@property (nonatomic, assign) NSString *title;
@property (nonatomic, assign) NSString *subtitle;

@end

添加时使用

MKAnno *anno = [[MKAnno alloc] init];
anno.coordinate = _mapview.centerCoordinate;
anno.title = @"测试位置";
anno.subtitle = @"这就是个测试位置而已";
[_mapview addAnnotation: anno];

调用效果

4.自定义大头针

实现MKMapViewDelegate代理的-(MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation方法，如

-(MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    NSString *identifier = @"test";
    MKPinAnnotationView *view = (MKPinAnnotationView*)[_mapview dequeueReusableAnnotationViewWithIdentifier:identifier];
    if (!view)
    {
        view = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
    }

    //设置右边View为一个自定义Button
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
    [button setTitle:@"我就试试" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside];
    [button setBackgroundColor:[UIColor greenColor]];
    view.rightCalloutAccessoryView = button;

    //设置针头颜色
    view.pinColor = MKPinAnnotationColorPurple;
    //设置允许弹出框
    view.canShowCallout = YES;
    //设置掉下动画
    view.animatesDrop = YES;
    return view;
}

实现方法后，添加大头针效果为

PS:如果返回nil，则按系统默认方法显示，而不是不现实

5.自定义大头针2 - 修改大头针样式

-(MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    NSString *identifier = @"test";
    MKPinAnnotationView *view = (MKPinAnnotationView*)[_mapview dequeueReusableAnnotationViewWithIdentifier:identifier];
    if (!view)
    {
        view = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
        view.canShowCallout = YES;
    }

    //覆盖掉默认的
    view.annotation = annotation;

    //设置右边View为一个自定义Button
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
    [button setTitle:@"我就试试" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside];
    [button setBackgroundColor:[UIColor greenColor]];
    view.rightCalloutAccessoryView = button;

    if (arc4random()% > ) {
        view.image = [UIImage imageNamed:@"A"];
    }
    else
    {
        view.image = [UIImage imageNamed:@"B"];
    }

    return view;
}

注意：不能使用animatesDrop，否则还是大头针

使用效果