PMODownloader.m - With Notification Center

PMODownloader.m

#import "PMODownloader.h"
#import "PMODownloadNotifications.h"

@implementation PMODownloader

#pragma mark - Public API
- (void)downloadDataFromURL:(NSURL *)url {
    //1
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    NSURLSession *session = [NSURLSession sharedSession];
    
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request
                                            completionHandler:
                                  ^(NSData *data, NSURLResponse *response, NSError *error) {
                                      if (error) {
                                          [self notifyObserverDownloadFailure];
                                      } else {
                                          [self notifyObserverWithProcessedData:data];
                                      }
                                  }];
    [task resume];

}

//2
#pragma mark - Notifications
- (void)notifyObserverWithProcessedData:(NSData *)data {
    NSDictionary *userInfo = @{@"downloadedData" : data };
    [[NSNotificationCenter defaultCenter] postNotificationName:PMODownloadWasSuccessful
                                                        object:self
                                                      userInfo:userInfo];
}


- (void)notifyObserverDownloadFailure {

    [[NSNotificationCenter defaultCenter] postNotificationName:PMODownloadFailed
                                                        object:self
                                                      userInfo:nil];
}
@end