视频播放器边下边播（保存到沙盒，显示进度）

#pragma mark - 这里改了 －－－－－－
#warning - 这里改了 －－－－－－－－
//#if !TARGET_OS_IOS && !TARGET_OS_WATCH
//static NSData * AFSecKeyGetData(SecKeyRef key) {
//    CFDataRef data = NULL;
//
//    __Require_noErr_Quiet(SecItemExport(key, kSecFormatUnknown, kSecItemPemArmour, NULL, &data), _out);
//
//    return (__bridge_transfer NSData *)data;
//
//_out:
//    if (data) {
//        CFRelease(data);
//    }
//
//    return nil;
//}
//#endif

static BOOL AFSecKeyIsEqualToKey(SecKeyRef key1, SecKeyRef key2) {
//#if TARGET_OS_IOS || TARGET_OS_WATCH
    return [(__bridge id)key1 isEqual:(__bridge id)key2];
//#else
//    return [AFSecKeyGetData(key1) isEqual:AFSecKeyGetData(key2)];
//#endif
}

/**
 * 下载文件
 */
- (void)downloadFileURL:(NSString *)aUrl savePath:(NSString *)aSavePath fileName:(NSString *)aFileName tag:(NSInteger)aTag
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    
    //检查本地文件是否已存在
    NSString *fileName = [NSString stringWithFormat:@"%@/%@", aSavePath, aFileName];
    
    //检查附件是否存在
    if ([fileManager fileExistsAtPath:fileName]) {
         [self addVideoPlayerWithURL:[NSURL fileURLWithPath:fileName]];
    }else{
        //创建附件存储目录
        if (![fileManager fileExistsAtPath:aSavePath]) {
            [fileManager createDirectoryAtPath:aSavePath withIntermediateDirectories:YES attributes:nil error:nil];
        }
//         [self addVideoPlayerWithURL:[NSURL fileURLWithPath:fileName]];
        [self addVideoPlayerWithURL:[NSURL URLWithString:aUrl]];
        //下载附件
        NSURL *url = [[NSURL alloc] initWithString:aUrl];
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        
        AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
        operation.inputStream   = [NSInputStream inputStreamWithURL:url];
        operation.outputStream  = [NSOutputStream outputStreamToFileAtPath:fileName append:NO];
        
        //下载进度控制
        
         [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
         NSLog(@"is download：%f", (float)totalBytesRead/totalBytesExpectedToRead);
         }];
        
        //已完成下载
        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
//            NSData *audioData = [NSData dataWithContentsOfFile:fileName];
            NSLog(@"完成下载");
            //设置下载数据到res字典对象中并用代理返回下载数据NSData
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"下载失败");
            //下载失败
        }];
        
        [operation start];
    }
}