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?
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.