AFN上传单张图片

//上传的服务器网址字符串
NSString *urlString = @"";
//UTF-8转码        
NSString *urlStr = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//AFN中上传单张图片的请求方法        
NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"" URLString:urlStr parameters:nil constructingBodyWithBlock:^(id formData) {
//将图片转化成data数据并对其等比例压缩            
NSData *imageData = UIImageJPEGRepresentation(image, 0.3);
//name参数对应的是接口文档中的该图片参数类型
[formData appendPartWithFileData:imageData name:@"image" fileName:@"image.jpg" mimeType:@"image/jpg"];

        } error:nil];
//创建AFURLSessionManager对象        
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
//创建NSURLSessionUploadTask对象添加请求
NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:^(NSProgress *uploadProgress) {

        } completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {

}];
//启动上传任务
[uploadTask resume];