MKAnnotation doesn't觸發銷點引法

Question

I'm創建與地圖，並使用以下類的註釋的圖：

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

@interface ContactDetailAnnotation : NSObject <MKAnnotation> 

- (id) initWithLatitude:(CLLocationDegrees) lat longitude:(CLLocationDegrees) lng; 
- (id) initWithCoordinate:(CLLocationCoordinate2D) coordinateArg; 

@property (unsafe_unretained) CLLocationDegrees latitude; 
@property (unsafe_unretained) CLLocationDegrees longitude; 
@property (unsafe_unretained, nonatomic) CLLocationCoordinate2D coordinate; 

@end 

的問題是，該方法：

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

用於繪製我的點不被觸發。 如果我使用

self.myMap.showsUserLocation = TRUE;  

的方法trigered，所以問題必須是在我創建的類。

我的.m

#import "ContactDetailAnnotation.h" 

@implementation ContactDetailAnnotation 

@synthesize latitude = _latitude, longitude = _longitude, coordinate = _coordinate; 

- (id) initWithCoordinate:(CLLocationCoordinate2D) coordinateArg 
{ 
    self.coordinate = coordinateArg; 

    return self; 
} 

- (id) initWithLatitude:(CLLocationDegrees)lat longitude:(CLLocationDegrees)lng 
{ 
    self.latitude = lat; 
    self.longitude = lng; 

    return self; 
} 

- (CLLocationCoordinate2D) coordinate 
{ 
CLLocationCoordinate2D coord = {self.latitude, 
           self.longitude}; 
return coord; 
} 

@end 

Answer 1

你的註釋添加到的MapView的annotations陣列？

編輯

這裏有一個最基本的實現，爲我工作：

MyAnnotation.h：

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

@interface MyAnnotation : NSObject <MKAnnotation> 
{ 
    CLLocationCoordinate2D coordinate; 
} 

@property (nonatomic) CLLocationCoordinate2D coordinate; 

- (id) initWithCoordinate:(CLLocationCoordinate2D)aCoordinate; 

@end 

MyAnnotation.m

#import "MyAnnotation.h" 

@implementation MyAnnotation 

@synthesize coordinate; 

- (id) initWithCoordinate:(CLLocationCoordinate2D)aCoordinate 
{ 
    coordinate = aCoordinate; 
    return self; 
} 

@end 

我見控制器：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    CLLocationCoordinate2D coordinate = {42.149,-74.9384}; 
    MyAnnotation *myAnnotation = [[MyAnnotation alloc] initWithCoordinate:coordinate]; 
    [self.mapView addAnnotation:myAnnotation]; 
} 

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    MKAnnotationView *annotationView = [self.mapView dequeueReusableAnnotationViewWithIdentifier:@"Identifier"]; 
    if (annotationView == nil) { 
     annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Identifier"]; 
    } 
    return annotationView; 
}