最近项目中用到了压缩包下载，使用AFNetworking 3.0 下载压缩包 支持断点续传 代码如下：

#import "HDInternet_handler.h"#import "AFNetworking.h"#import "ASIHTTPRequest.h"@interface HDInternet_handler ()
     
      @end@implementation HDInternet_handler{    NSURLSessionDownloadTask *_downloadTask;}-(void)test{    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];        AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:configuration];        manager.requestSerializer.timeoutInterval = 3.0;        [manager setDownloadTaskDidWriteDataBlock:^(NSURLSession * _Nonnull session, NSURLSessionDownloadTask * _Nonnull downloadTask, int64_t bytesWritten, int64_t totalBytesWritten, int64_t totalBytesExpectedToWrite) {                LOG(@"%.2f / %.2f",(float)totalBytesWritten/1024.0/1024.0,(float)totalBytesExpectedToWrite/1024.0/1024.0);    }];        NSURL *URL = [NSURL URLWithString:@"http://192.168.10.155/12345/HD_DEMO_RES/CHINESE.zip"];//http://192.168.10.155/12345/HD_DEMO_RES/CHINESE.zip    NSURLRequest *request = [NSURLRequest requestWithURL:URL];        _downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {                NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSCachesDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];        return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];    } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {           }];        [_downloadTask resume];    [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(suspend) userInfo:nil repeats:NO];}-(void)suspend{    //暂停下载    [_downloadTask suspend];    LOG(@"SUSPEND.....SUSPEND....SUSPEND....SUSPEND....SUSPEND....SUSPEND....");    [NSTimer scheduledTimerWithTimeInterval:6.0 target:self selector:@selector(resume) userInfo:nil repeats:NO];}-(void)resume{
    //继续下载    [_downloadTask resume];    LOG(@"RESUME.....RESUME.....RESUME.....RESUME.....RESUME.....RESUME.....RESUME.....");}