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 - 1];
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 = 0; 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:0];
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(0, 0, 100, 100)];
[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(0, 0, 100, 100)];
[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()%100 > 50) {
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