问题
in the implementations class charged of displaying PINS, i have reserved two variables (title and sub title), in this example, only the word USA (the title) is displayed when i click on the PIN.
CLLocationCoordinate2D location2D = (CLLocationCoordinate2D){ .latitude = latitudeOfUserLocation, .longitude = longitudeOfUserLocation };
ManageAnnotations *annotation=[[ManageAnnotations alloc]initWithTitle:@"USA" adresseDuTheme:@"Colorado" coordinate:location2D];//only USA is displayed
annotation.pinColor = MKPinAnnotationColorRed; //or red or whatever
[self->mapView addAnnotation:annotation];
MKCoordinateSpan span={.latitudeDelta=1,.longitudeDelta=0.5};
MKCoordinateRegion region={location2D,span};
[mapView setRegion:region];
Although, in ManageAnnotations class, i have reserved two variables for the title and the subtitle.
@interface ManageAnnotations : NSObject<MKAnnotation>{
NSString *_libelle;
NSString *_adresse;
CLLocationCoordinate2D _coordinate;
}
//
@property(nonatomic,assign)MKPinAnnotationColor pinColor;
@property(copy)NSString *libelle;
@property(copy)NSString *adresse;
@property(nonatomic,readonly)CLLocationCoordinate2D coordinate;
-(id)initWithTitle:(NSString*)libelle adresseDuTheme:(NSString*)adresse coordinate:(CLLocationCoordinate2D)coordinate;
@end
#import "ManageAnnotations.h"
@implementation ManageAnnotations
@synthesize pinColor;
@synthesize libelle=_libelle;
@synthesize adresse=_adresse;
@synthesize coordinate=_coordinate;
-(id)initWithTitle:(NSString*)libelle adresseDuTheme:(NSString*)adresse coordinate:(CLLocationCoordinate2D)coordinate{
if((self=[super init])){
_libelle=[libelle copy];
_adresse=[adresse copy];
_coordinate=coordinate;
}
return self;
}
-(NSString*)title{
return _libelle;
}
-(NSString*)subTitle{
return _adresse;
}
@end
回答1:
The MKAnnotation protocol defines the subtitle property as:
@property (nonatomic, readonly, copy) NSString *subtitle
Note subtitle is all lowercase but your class has subTitle (uppercase T) which the map view will not call.
Change the method declaration to:
-(NSString*)subtitle
回答2:
change subTitle to subtitle in method declaration and property declaration and it will work. :) happy coding,
来源：https://stackoverflow.com/questions/8743790/my-annotations-doesnt-show-the-sub-title-in-the-pin