MAC：文件下载

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSURL *URL = [NSURL URLWithString:url];

NSURLRequest *request = [NSURLRequest requestWithURL:URL];

NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
    
    NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSApplicationDirectory inDomain:NSLocalDomainMask appropriateForURL:nil create:NO error:nil];
    
    return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
    
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
    
    NSLog(@"File downloaded to: %@", filePath);
    
}];

[downloadTask resume];