Trouble creating a custom annotation class in ios - iphone

Question

I'm trying to make a custom MKAnnotation class so it can hold additional information but i keep getting this error :
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '- [AnnotationForId setCoordinate:]: unrecognized selector sent to instance 0x16f63340'
I've tried looking up how to create one and i've followed what i've found online and i'm confused at why i keep getting this error.
Here is my custom annotation class.
#import <MapKit/MapKit.h>
#import <UIKit/UIKit.h>
#interface AnnotationForId : NSObject <MKAnnotation >{
NSString *title;
NSString *subtitle;
CLLocationCoordinate2D coordinate;
NSInteger shopId;
}
#property(nonatomic)NSInteger shopId;
#property (nonatomic, copy) NSString * title;
#property (nonatomic, copy) NSString * subtitle;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
#end
I've synthesized the property variables in .m class.
I try to call the custom class in my main controller:
for(Shop *shops in feed.shops){
NSLog(#"reached");
AnnotationForId *shop = [[AnnotationForId alloc] init];
CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(shops.latitude, shops.longitude);
shop.coordinate = coords;
//[[CLLocationCoordinate2DMake(shops.latitude, shops.longtitude)]];
shop.title = shops.name;
shop.subtitle = #"Coffee Shop";
[map addAnnotation:shop];
}
Any help to why this isnt working would be awesome.
Thanks.

Answer 1

It seems like you're trying to set your readonly property.
You declared it as readonly:
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
But then you're trying to use setter:
shop.coordinate = coords;
readonly means that no setter will be defined for other classes to leverage.
Edit:
I think you should add convenience initializer to your AnnotationForId class like:
-(id)initWithCoordinate:(CLLocationCoordinate2D)coord
{
self = [super init]; // assuming init is the designated initialiser of the super class
if (self)
{
coordinate = coord;
}
return self;
}
So your code will look like this:
for(Shop *shops in feed.shops){
NSLog(#"reached");
CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(shops.latitude, shops.longitude);
AnnotationForId *shop = [[AnnotationForId alloc] initWithCoordinate:coords];
//[[CLLocationCoordinate2DMake(shops.latitude, shops.longtitude)]];
shop.title = shops.name;
shop.subtitle = #"Coffee Shop";
[map addAnnotation:shop];
}

Answer 2

This is Simple Example For how to Create Custom AnnotationView.
Create custom AnnotationView:
#import <MapKit/MapKit.h>
#interface AnnotationView : MKPlacemark
#property (nonatomic, readwrite, assign) CLLocationCoordinate2D coordinate;
#property (nonatomic, strong) NSString *title;
#property (nonatomic, strong) NSString *subtitle;
// you can put here any controllers that you want. (such like UIImage, UIView,...etc)
#end
And in .m file
#import "AnnotationView.h"
#implementation AnnotationView
- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate addressDictionary:(NSDictionary *)addressDictionary
{
if ((self = [super initWithCoordinate:coordinate addressDictionary:addressDictionary]))
{
self.coordinate = coordinate;
}
return self;
}
#end
// Use Annotation Add #import "AnnotationView.h" in your relevant .m file:
CLLocationCoordinate2D pCoordinate ;
pCoordinate.latitude = LatValue;
pCoordinate.longitude = LanValue;
// Create Obj Of AnnotationView class
AnnotationView *annotation = [[AnnotationView alloc] initWithCoordinate:pCoordinate addressDictionary:nil] ;
annotation.title = #"I m Here";
annotation.subtitle = #"This is Sub Tiitle";
[self.mapView addAnnotation:annotation];
Above is simple Example of how to create AnnotationView.

Answer 3

You have given the property as readonly, which sets only a getter method for the property. So please make the property retain and try it once again.