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Objective-C ??????

? Objective-C ??NSURLSession ?????????????????????? NSURLSession ??????????????????

?????????

??? Objective-C ??????

???????? Objective-C ???????????????????????

#import 
   
    @interface FileDownloader : NSObject@end@implementation FileDownloader- (void)downloadFileWithURL:(NSURL *)url{    // ??????????    NSURLSession *session = [NSURLSession sharedSession];        // ??????    NSURLRequest *request = [NSURLRequest requestWithURL:url];        // ??????    DownloadTask *downloadTask = [session downloadTaskWithRequest:request        completionHandler:^(NSURLResponse *response, NSHTTPURLResponseCode code, !NSError *error)    {        // ??????        if (error)        {            // ??????            NSLog(@"?????%@", error.localizedDescription);            return;        }                // ???????        NSData *responseData = [response dataUsingEncoding:NSUTF8StringEncoding];                // ???????????        [responseData writeToFile:@"/path/to/file" atomically:YES];                // ??????        [downloadTask cancel];                // ????        [session finishTasks];    }];        // ??????    [downloadTask resume];}@end
   

????

• ????????????? URL??????????
• ?????????? backgroundSession ???????????
• ???????????? completionHandler ??????????????? resume ????????

??????????? Objective-C ????????????????

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