Rescue object to keep information of photo resources with different types (such as UIImage, NSUR, etc)

PhotoResource.m

//
//  PhotoResource.h
//  Modeling
//
//  Created by Heechul on 1/8/16.
//  Copyright © 2016 Heechul Ryu. All rights reserved.
//

#import <UIKit/UIKit.h>

@protocol PhotoResourcable <NSObject>
@end

@interface UIImage () <PhotoResourcable>
@end

@interface NSURL () <PhotoResourcable>
@end

typedef enum {
    PhotoResourceTypeImage,
    PhotoResourceTypeUrl,
} PhotoResourceType;

@interface PhotoResource : NSObject

@property (nonatomic, assign, readonly) PhotoResourceType type;
@property (nonatomic, strong, readonly) UIImage *image;
@property (nonatomic, strong, readonly) NSURL *url;

+ (instancetype)resourceWithType:(PhotoResourceType)type resourcePath:(NSString *)resourcePath;
+ (instancetype)resourceWithResourcable:(id<PhotoResourcable>)resourcable;
@end



//
//  PhotoResource.m
//  Modeling
//
//  Created by Heechul on 1/8/16.
//  Copyright © 2016 Heechul Ryu. All rights reserved.
//

#import "PhotoResource.h"
@interface PhotoResource ()
@property (nonatomic, assign) PhotoResourceType type;
@property (nonatomic, strong) UIImage *image;
@property (nonatomic, strong) NSURL *url;
@end

@implementation PhotoResource

+ (instancetype)resourceWithResourcable:(id<PhotoResourcable>)resourcable
{
    PhotoResource *resource = [[PhotoResource alloc] initWithResourcable:resourcable];
    return resource;
}

+ (instancetype)resourceWithType:(PhotoResourceType)type resourcePath:(NSString *)resourcePath
{
    switch (type) {
        case PhotoResourceTypeUrl:
            return [self resourceWithResourcable:[NSURL URLWithString:resourcePath]];

        case PhotoResourceTypeImage:
            return [self resourceWithResourcable:[UIImage imageNamed:resourcePath]];

        default:
            break;
    }
}

- (id)initWithResourcable:(id<PhotoResourcable>)resourcable
{
    self = [self init];
    if (self) {
        if ([resourcable isKindOfClass:[NSURL class]]) {
            self.type = PhotoResourceTypeUrl;
            self.url = (NSURL *) resourcable;
        }
        else if ([resourcable isKindOfClass:[UIImage class]]) {
            self.type = PhotoResourceTypeImage;
            self.image = (UIImage *) resourcable;
        }
    }

    return self;
}

@end