iOS NSURLSessionDownloadTask example setting proxy file download

#import ""
@interface ViewController ()<NSURLSessionDownloadDelegate>
@end
@implementation ViewController
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
  [self delegate];
}

-(void)delegate
{
  //
  NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_03.png"];
  
  //2. Create a request object  NSURLRequest *request = [NSURLRequest requestWithURL:url];
  
  //3. Create session: Note that the proxy is NSURLSessionDownloadDelegate  NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
  
  //4. Create Task  NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request];
  
  //5.Execute Task  [downloadTask resume];
}

#pragma mark ----------------------
#pragma mark NSURLSessionDownloadDelegate
/**
  * Write data
  *
  * @param session session object
  * @param downloadTask Download Task
  * @param bytesWritten The size of the data written this time
  * @param totalBytesWritten The total size of the downloaded data
  * @param totalBytesExpectedToWrite file total size
  */
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{
  //1. Obtain the file download progress  NSLog(@"%f",1.0 * totalBytesWritten/totalBytesExpectedToWrite);
}

/**
  * Call this method when downloading is restored
  *
  * @param fileOffset Where to download
  * @param expectedTotalBytes file size
  */
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes
{
  NSLog(@"%s",__func__);
}

/**
  * Called when the download is complete
  *
  * @param location temporary storage path for file
  */
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{
  NSLog(@"%@",location);
  
  //1 Full path of splicing file  NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:];
  
  //2 Cut the file  [[NSFileManager defaultManager]moveItemAtURL:location toURL:[NSURL fileURLWithPath:fullPath] error:nil];
  NSLog(@"%@",fullPath);
}

/**
  * End of request
  */
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
  NSLog(@"didCompleteWithError");
}
@end