objective C filling array with custom class pointers

Question

favorites = [[NSMutableArray alloc] init];

for (int i=0; i<9; i++) {

  [favorites addObject:[[[Favorite alloc] constructUnknown] autorelease]];



 }

i'm getting:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[Favorite size]: unrecognized selector sent to instance 0x380d9c0'

why?

Favorite is my custom class, favorites an array containing 9 instances of my custom class

edit:

Favorite.h:

-(Favorite*)constructUnknown;

Favorite.m:

 - (Favorite*)constructUnknown{


self=[super init];

if (self) {
    image=[UIImage imageNamed:@"unknown.png"];
}

return self;

}

COMPLETE FAVORITES.h

@interface Favorite : NSObject {

NSString *identity;
bool ready;

UIImage *image;
NSURL *telephone;


}

@property (nonatomic,retain) UIImage *image;
@property (nonatomic,retain) NSURL *telephone;
@property (nonatomic,retain) NSString *identity;

//passare unknown al nome per costrutire un oggetto unknown.
-(Favorite*)constructWithID:(NSString*)name withPhoto:(UIImage*)photo andNumber:(NSString*)number;

-(Favorite*)constructUnknown;
-(NSURL*) convertToUrl:(NSString*)phone;
- (UIImage*) getImage;

@end

Answer 1

anyone willing to help?i am crushing my mind here and cannot go on.

Answer 2

The exception is likely because your image is not retained. Try

image = [[UIImage imageNamed:@"unknown.png"] retain];

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BTW, initializers should be named as -initXXX and return an id by convention. e.g.

 -(id)initWithUnknown{ ... }