PMOPictureController.m

PMOPictureController.m

#import "PMOPictureController.h"
#import "PMODownloader.h"
#import "PMOPictureWithURL.h"
//1
#define CLASS_NAME NSStringFromClass([self class])
#define INIT_EXCEPTION_MESSAGE [NSString stringWithFormat:@"Use [[%@ alloc] initWithPictureURL:]",CLASS_NAME]

@interface PMOPictureController()
//2
/**
 Our private data class, storing and hiding the information.
 */
@property (strong, nonatomic, nullable) PMOPictureWithURL *pictureWithUrl;

@end

@implementation PMOPictureController

#pragma mark - Initializers
- (instancetype)initWithPictureURL:(NSURL *)url {
    if (url) {
        self = [super init];
        if (self) {
            _pictureWithUrl = [[PMOPictureWithURL alloc] initWithPictureURL:url];
        }
        return self;
    } else {
        @throw [NSException exceptionWithName:@"Can't be initialised with null parameter"
                                       reason:INIT_EXCEPTION_MESSAGE
                                     userInfo:nil];
        return nil;
    }
    
}


//Save the diagnostic state
#pragma clang diagnostic push

//Ignore -Wobjc-designated-initializers warnings
#pragma clang diagnostic ignored "-Wobjc-designated-initializers"
- (instancetype)init
{
    @throw [NSException exceptionWithName:@"Not designated initializer"
                                   reason:INIT_EXCEPTION_MESSAGE
                                 userInfo:nil];
    return nil;
}
//Restore the disgnostic state
#pragma clang diagnostic pop

#pragma mark - Public API
- (void)downloadImage {
    
    PMODownloader *downloader = [[PMODownloader alloc] init];
    self.pictureWithUrl.image = [[UIImage alloc] initWithData:[downloader downloadDataFromURL:self.pictureWithUrl.imageURL]];
}

- (UIImage *)image {
    return self.pictureWithUrl.image;
}

@end