AFNetworking上传一张或多张图片,并压缩图片节约占用内存

最近在做APP的时候，遇到了难题：根据公司需求，在用户评论并上传图片的时候，有的手机像素比较高拍的照片高清的，但是每张图片占用的内存太大，或者上传照片的时候，相册的部分照片本身就占很大内存空间，后台数据库内存量有限，如果后期用户达到了几百万，每个用户都评论并上传这么高像素大内存的图片上去，后台数据库怕承受不了，继续拓展后台存储量的话，需要很大成本，那么怎么在前台来处理这些上传的图片而又不失大体呢？

这次总结得是用AFNetworking 向后台传输一张或多张图片，并且将照片压缩，感觉还是AFNetworking好使，相比原生的NSSURLsession的传输方法，话不多说，开始分享，用的话，代码基本不用改，直接用~（上传头像的时候，点击保存~触发这个）

上传单张图片：

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 UIImage *image = [UIImage  imageNamed:@""];
    NSMutableDictionary *photo = [NSMutableDictionary dictionary];
    [photo setObject:@"" forKey:@"phoneNumber"];

    [photo setObject:@"" forKey:@"psw"];

    NSLog(@"1111%@",photo);

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.requestSerializer.timeoutInterval = ;
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithArray:@[@"text/plain",@"multipart/form-data"]];
    [manager POST:@"http://192.168.0.105:8080/miracle/Upload.action" parameters:photo constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

        NSDate *date = [NSDate date];
        NSDateFormatter *formormat = [[NSDateFormatter alloc]init];
        [formormat setDateFormat:@"HHmmss"];
        NSString *dateString = [formormat stringFromDate:date];

        NSString *fileName = [NSString  stringWithFormat:@"%@.png",dateString];
        NSData *imageData = UIImageJPEGRepresentation(image, );
        double scaleNum = (double)*/imageData.length;
        NSLog(@"图片压缩率：%f",scaleNum);

        if(scaleNum <){

            imageData = UIImageJPEGRepresentation(image, scaleNum);
        }else{

            imageData = UIImageJPEGRepresentation(image, 0.1);

        }

        [formData  appendPartWithFileData:imageData name:@"files" fileName:fileName mimeType:@"image/jpg/png/jpeg"];

    } progress:^(NSProgress * _Nonnull uploadProgress) {

        NSLog(@"---%@",uploadProgress);

    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        NSLog(@"`````````%@",responseObject);

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

    }];

上传多张图片：

 NSArray * _imageArr = @[@"",@"",@""];

     AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
     manager.requestSerializer.timeoutInterval = ;
     manager.responseSerializer.acceptableContentTypes = [NSSet setWithArray:@[@"text/plain",@"multipart/form-data"]];
     [manager POST:@"http://192.168.0.105:8080/miracle/Upload.action" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

         for (int i=; i<_imageArr.count; i++) {

         UIImage * image =[UIImage  imageNamed:_imageArr[i]];
         NSDate *date = [NSDate date];
         NSDateFormatter *formormat = [[NSDateFormatter alloc]init];
         [formormat setDateFormat:@"HHmmss"];
         NSString *dateString = [formormat stringFromDate:date];

         NSString *fileName = [NSString  stringWithFormat:@"%@.png",dateString];
         NSData *imageData = UIImageJPEGRepresentation(image, );
         double scaleNum = (double)*/imageData.length;
         NSLog(@"图片压缩率：%f",scaleNum);

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         if(scaleNum <){

             imageData = UIImageJPEGRepresentation(image, scaleNum);
         }else{

             imageData = UIImageJPEGRepresentation(image, 0.1);

         }

         [formData  appendPartWithFileData:imageData name:@"files" fileName:fileName mimeType:@"image/jpg/png/jpeg"];
         }
     } progress:^(NSProgress * _Nonnull uploadProgress) {

         NSLog(@"---%@",uploadProgress);

     } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

         NSLog(@"`````````%@",responseObject);

     } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

     }];