iOS AFNetWrking PostBody传参

// 使用body传数据
+ (NSURLSessionTask *)postBodyWithApi:(NSString *)api json:(id)json callback:(APICallback)callback {
    
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    NSMutableURLRequest *request = [manager.requestSerializer requestWithMethod:@"POST" URLString:urlstr parameters:nil error:&requestError];
     request.timeoutInterval = 30;
    // 设置header
    [request setValue:@"" forHTTPHeaderField:@"token"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    // body
    NSData *postData = [json dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:postData];
    
    NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request uploadProgress:^(NSProgress * _Nonnull uploadProgress) {
        
    } downloadProgress:^(NSProgress * _Nonnull downloadProgress) {
        
    } completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
        if (!error) {
           
        }else{
           
        }
    }];
    [dataTask resume];
    return dataTask;
}