如何使用另一种方法调用MKAnnotation方法使用Objective C

Question

-(MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation { 

} 

MKAnnotationView方法用于在地图中显示图标。如何使用objective-c在-didUpdateToLocation方法中调用MKAnnotationView方法？

Answer 1

我不知道这是否是你想要什么，但：

下面是我为注释写的类：

.h文件中：

#import <Foundation/Foundation.h> 
#import <MapKit/MapKit.h> 

@interface MyLocation : NSObject <MKAnnotation> { 
    NSString *_name; 
    NSString *_address; 
    CLLocationCoordinate2D _coordinate; 
} 

@property (copy) NSString *name; 
@property (copy) NSString *address; 
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate; 

- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate; 

@end 

和。 m文件：

#import "MyLocation.h" 

@implementation MyLocation 
@synthesize name = _name; 
@synthesize address = _address; 
@synthesize coordinate = _coordinate; 

- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate { 
    if ((self = [super init])) { 
     _name = [name copy]; 
     _address = [address copy]; 
     _coordinate = coordinate; 
    } 
    return self; 
} 

- (NSString *)title { 
    if ([_name isKindOfClass:[NSNull class]]) 
     return @"Unknown charge"; 
    else 
     return _name; 
} 

- (NSString *)subtitle { 
    return _address; 
} 

@end 

并在视图控制器中我打电话给位置管理器，如：

locationManager = [[CLLocationManager alloc] init]; 
locationManager.delegate = self; 
locationManager.distanceFilter = 10.0; // whenever we move 
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m 
[locationManager startUpdatingLocation];  

，然后在外景经理的委托方法我设置我的地图是这样的：

- (void)locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
      fromLocation:(CLLocation *)oldLocation 
{ 
    [locationManager stopUpdatingLocation]; 
    //CLLocationCoordinate2D newCoord = { newLocation.coordinate.latitude, newLocation.coordinate.longitude }; 

    CLLocationCoordinate2D centerPoint = { newLocation.coordinate.latitude, newLocation.coordinate.longitude }; 
    MKCoordinateSpan coordinateSpan = MKCoordinateSpanMake(0.01, 0.01); 
    MKCoordinateRegion coordinateRegion = MKCoordinateRegionMake(centerPoint, coordinateSpan); 

    ["your-map-name" setRegion:coordinateRegion]; 
    ["your-map-name" regionThatFits:coordinateRegion]; 

CLLocationCoordinate2D cordPoint = { latitude_value, longitude_value }; 
      MyLocation *annotation = [[MyLocation alloc] initWithName:@"title of the pin" address:@"some sub string" coordinate:cordPoint] ; 
      ["your-map-name" addAnnotation:annotation]; } 

这是我如何解决我的标注和地图的问题..

我希望这有助于..