Objective C Property Syntax - objective-c

Question

I have quick question regarding my code:
This is my Animal.h header file:
#import <Foundation/Foundation.h>
#interface Animal : NSObject
#property (nonatomic) int age;
#property (nonatomic, strong) NSString *name;
#property (nonatomic,strong) NSString *breed;
#property (retain, nonatomic) UIImage *image;
-(void) bark;
-(void)barkNumTimes: (int)numOfTimesToBark;
-(void)barknumTimes:(int)numberOfTimes loudly:(bool) isLoud;
-(int) ageInDogYears: (int)humanYears;
#end
For some reason at the line:
#property (retain, nonatomic) UIImage *image;
I get an error saying that "Property with 'retain (or strong)' attribute must be of object type".
My ViewController.m class is where I created three Animal objects and used the UIImage property which I created in Animal.h and set each of the Animal objects UIImage property to a certain image I have in my supporting files:
#import "ViewController.h"
#import "Animal.h"
#import "Puppy.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.whichDog = 0;
Animal *whiteDog = [[Animal alloc]init];
[whiteDog setName:#"white"];
[whiteDog setBreed:#"White Dog"];
whiteDog.image = [UIImage imageNamed:#"whitedog.jpeg"];
Animal *brownDog = [[Animal alloc] init];
[brownDog setName:#"brown"];
[brownDog setBreed:#"Brown Dog"];
brownDog.image = [UIImage imageNamed:#"browndog.jpeg"];
Animal *husky = [[Animal alloc] init];
[husky setName:#"husky"];
[husky setBreed:#"Husky Dog"];
husky.image = [UIImage imageNamed:#"husky.jpeg"];
self.myAnimals = [[NSMutableArray alloc] init];
[self.myAnimals addObject:whiteDog];
[self.myAnimals addObject:brownDog];
[self.myAnimals addObject:husky];
Puppy *pup = [[Puppy alloc]init];
[pup setName:#"coby"];
[pup setBreed:#"Portuguese Water Dog"];
pup.image = [UIImage imageNamed:#"puppy.jpeg"];
}
- (IBAction)newDogBarButton:(UIBarButtonItem *)sender{
int numOfDogs = (int)[self.myAnimals count];
int randomIndex = arc4random() % numOfDogs;
Animal *randomAnimal = [self.myAnimals objectAtIndex:randomIndex];
[UIView transitionWithView:self.view duration:1.5 options:UIViewAnimationOptionTransitionCurlDown animations:^{
self.imageView.image = randomAnimal.image;
self.carNAme.text = randomAnimal.name;
self.extra.text = [randomAnimal breed];
} completion:^(BOOL finished) {
}];
sender.title = #"And Another";
self.whichDog = randomIndex;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
For some reason in Animal.h I keep getting that error which says "Property with 'retain (or strong)' attribute must be of object type". I am not very sure on what this retain or strong means in the properties, but can someone please explain to me what I am doing wrong in my code. Thank you so much for the help.

Answer 1

UIImage belongs to UIKit, so import UIKit instead of Foundation