IOS后台模式AddOperation队列

Question

我想以后台模式发送我的文件但是当我切换到后台上传停止时。但是发送video.i发送视频发布方法没有问题。但是我发送的图像是字符串...

我开始行动的方式

  [[AFHTTPRequestOperationManager manager].operationQueue addOperation:requestOperation];

初始化为帖子

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] requestWithMethod:@"POST" URLString:[NSString stringWithFormat:@"%@%@",API_URL,Upload_Image] parameters:paraDict error:nil];

其他代码：

[requestOperation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
    MAINPATCH
    double percentDone = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
    NSLog(@"progress updated(percentDone) : %f", percentDone);
    progressView2.progress = percentDone;
    patchEND
}];

处理

    [requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

}];