Is there a simple example project for MKAnnotation
? I don't know what to pass at "addAnnotation
", as it wants some "id<Annotation>
".
The examples at the developer site are all with arrays or parsers or so, I just need a very easy example to first understand, how the whole thing works.
Thanks in advance..
EDIT:
I set up a class Pin
. In the .h it writes
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface Pin : NSObject <MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subTitle;
}
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, readonly) NSString *title;
@property (nonatomic, readonly) NSString *subTitle;
- (id)initWithCoordinates:(CLLocationCoordinate2D)location placeName:(NSString *)placeName description:(NSString *)description;
@end
according to what onnoweb answered.
In the Pin.m, I implemented like this, according to different examples:
#import "Pin.h"
@implementation Pin
@synthesize title, subTitle;
- (CLLocationCoordinate2D) coordinate {
CLLocationCoordinate2D coords;
coords.latitude = coordinate.latitude; //i want it that way
coords.longitude = 7.1352260; //this way it works
return coords;
- (NSString *) title {
return @"Thats the title";
}
- (NSString *) subtitle {
return @"Thats the sub";
}
- (id)initWithCoordinates:(CLLocationCoordinate2D)location placeName:(NSString *)placeName description:(NSString *)description {
return self;
}
- (void) dealloc {
[super dealloc];
}
@end
So if I set the coordinates by hand, as pointed in the comment, it works. But I'd like to be able to set the value dynamically like in the first comment. I tried various ways, but none worked out. As you don't specify a - (CLLocationCoordinate2D) coordinate
I tried to just synthesize coordinate
, but like that it won't work either.
Could you show me your MapPin.m?
EDIT 2:
I set mapCenter
like
- (void)viewWillAppear:(BOOL)animated {
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.delegate = self;
[self.locationManager startUpdatingLocation];
CLLocation *curPos = locationManager.location;
location = curPos.coordinate;
CLLocationCoordinate2D mapCenter;
mapCenter.latitude = location.latitude;
mapCenter.longitude = location.longitude;
MKCoordinateSpan mapSpan;
mapSpan.latitudeDelta = 0.005;
mapSpan.longitudeDelta = 0.005;
MKCoordinateRegion mapRegion;
mapRegion.center = mapCenter;
mapRegion.span = mapSpan;
mapKitView.region = mapRegion;
mapKitView.mapType = MKMapTypeStandard;
mapKitView.showsUserLocation=TRUE;
}
Anything wrong with that?
Derived from the MKAnnotationView class, an annotation view draws the visual representation of the annotation on the map surface. Register annotation views with the MKMapView so the map view can create and efficiently reuse them.
To remove a single annotation from an annotation manager, remove it from the annotations array. To completely remove an annotation manager, call mapView. annotations.
You need to have a class implementing the MKAnnotation
protocol. Here is a snippet from one of my projects:
@interface MapPin : NSObject<MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, readonly) NSString *title;
@property (nonatomic, readonly) NSString *subtitle;
- (id)initWithCoordinates:(CLLocationCoordinate2D)location placeName:(NSString *)placeName description:(NSString *)description;
@end
Then, where you create the map you'll call:
pin = [[MapPin alloc] initWithCoordinates:[track startCoordinates] placeName:@"Start" description:@""];
[map addAnnotation:pin];
EDIT:
Here is the implementation:
@implementation MapPin
@synthesize coordinate;
@synthesize title;
@synthesize subtitle;
- (id)initWithCoordinates:(CLLocationCoordinate2D)location placeName:placeName description:description {
self = [super init];
if (self != nil) {
coordinate = location;
title = placeName;
[title retain];
subtitle = description;
[subtitle retain];
}
return self;
}
- (void)dealloc {
[title release];
[subtitle release];
[super dealloc];
}
@end
Hope this helps, Onno.
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