Can't set title on MKPinAnnotationView - ios

Question

I have followed this tutorial:
http://www.shawngrimes.me/2011/04/custom-map-pins-for-mapkit/#comment-193
but I can't add a title and description
(see my code here http://pastebin.com/03mDLc9q)

Answer 1

You are trying to set name and description as properties of your annotation's view, you should be using title and subtitle on your annotation object - MyAnnotationClass, the annotation view will use title and subtitle of this object when the callout is rendered.
I changed your code to work here: http://pastebin.com/YRGYhQev
#interface MyAnnotationClass : NSObject<MKAnnotation>
#property (nonatomic, retain) NSString *title;
#property (nonatomic, retain) NSString *subtitle;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
-(id) initWithCoordinate:(CLLocationCoordinate2D) coordinate;
#end
MyAnnotationClass.m
#import "MyAnnotationClass.h"
#implementation MyAnnotationClass
-(id) initWithCoordinate:(CLLocationCoordinate2D) coordinate{
self=[super init];
if(self){
_coordinate = coordinate;
}
return self;
}
-(void) dealloc{
[_title release];
[_subtitle release];
[super dealloc];
}
#end
ViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface ViewController : UIViewController<MKMapViewDelegate> {
IBOutlet MKMapView *_myMapView;
NSArray *_myAnnotations;
}
#property (nonatomic, retain) NSArray *myAnnotations;
#property (nonatomic, retain) IBOutlet MKMapView *myMapView;
#end
ViewController.m
#import "ViewController.h"
#import "AppDelegate.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "PlaceMark.h"
#import "MyAnnotationClass.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize myMapView = _myMapView;
#synthesize myAnnotations = _myAnnotations;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
-(void) viewDidLoad{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];
//Initialize annotation
MyAnnotationClass *commuterLotAnnotation=[[MyAnnotationClass alloc] initWithCoordinate:CLLocationCoordinate2DMake(appDelegate.latitude , appDelegate.longitude)];
commuterLotAnnotation.title = #"Hello title";
commuterLotAnnotation.subtitle = #"Correct";
MyAnnotationClass *overflowLotAnnotation=[[MyAnnotationClass alloc] initWithCoordinate:CLLocationCoordinate2DMake(appDelegate.latitude , appDelegate.longitude)];
overflowLotAnnotation.title = #"Hello title";
overflowLotAnnotation.subtitle = #"Correct";
//Add them to array
self.myAnnotations=[NSArray arrayWithObjects:commuterLotAnnotation, overflowLotAnnotation, nil];
//Release the annotations now that they've been added to the array
[commuterLotAnnotation release];
[overflowLotAnnotation release];
//add array of annotations to map
[_myMapView addAnnotations:_myAnnotations];
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation{
static NSString *parkingAnnotationIdentifier=#"ParkingAnnotationIdentifier";
if([annotation isKindOfClass:[MyAnnotationClass class]]){
//Try to get an unused annotation, similar to uitableviewcells
MKAnnotationView *annotationView=[_myMapView dequeueReusableAnnotationViewWithIdentifier:parkingAnnotationIdentifier];
//If one isn't available, create a new one
if(!annotationView){
annotationView=[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:parkingAnnotationIdentifier];
//Here's where the magic happens
annotationView.image=[UIImage imageNamed:#"apple.gif"];
annotationView.canShowCallout = YES;
}
return annotationView;
}
return nil;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end

Answer 2

I see that the tutorial has the MyAnnotationClass interface as:
#interface MyAnnotationClass : NSObject
When I used MKAnnotation I set my annotation interface up as:
#interface MyAnnotationClass : MKAnnotationView <MKAnnotation>
Then in the MyAnnotationClass.m file I have the following methods:
- (NSString *)title{
return self.name;
}
- (NSString *)subtitle{
return self.description;
}