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我正在使用AFHTTPRequestOperation下載文件。但是在暫停和恢復操作時，api會給出不正確的進度計數。我使用下面的代碼AFNetworking給出錯誤的進度計數
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:str]];
_downloadOperation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
_downloadOperation.outputStream = [NSOutputStream outputStreamToFileAtPath:strFilePath append:YES];
[_downloadOperation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
NSLog(@"Progress %lld",totalBytesRead * 100/totalBytesExpectedToRead);
}];
[_downloadOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"downloaded %@",operation.request.URL);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"failed");
}];
[_downloadOperation start];
當用戶進入後臺我暫停運行下載數據，
- (void)applicationDidEnterBackground:(UIApplication *)application
{
if ([objAPI.downloadOperation isExecuting])
[objAPI.downloadOperation pause];
}
，當用戶來到在前臺恢復運行
- (void)applicationWillEnterForeground:(UIApplication *)application
{
if ([objAPI.downloadOperation isPaused])
[objAPI.downloadOperation resume];
}
例子：如果操作在進度中暫停20％，則在恢復時從20％開始，但結束於120％。換句話說，暫停操作後，進度計數不正確。
請幫我解決這個問題