筆者目前比較關(guān)注的點(diǎn)是第三方框架中，刪除指定下載任務(wù)的處理邏輯。

1.FGDownloader

• 地址
  https://github.com/Insfgg99x/FGDownloader

• 移除任務(wù)示例

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    TaskModel *model=[_dataArray objectAtIndex:indexPath.row];
    [[FGDownloadManager shredManager] removeForUrl:model.url file:model.destinationPath];
    [_dataArray removeObjectAtIndex:indexPath.row];
    [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    __weak typeof(self) wkself=self;
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [wkself.tbView reloadData];
        });
    });
}

• 問題
  移除的方法里邊有bug 當(dāng)其他任務(wù)在下載的時(shí)候 移除會(huì)導(dǎo)致無法暫停
  [[FGGDownloadManager shredManager] removeForUrl:model.url file:model.destinationPath];移除的時(shí)候下載隊(duì)列出問題了

• 問題地址
  https://github.com/Insfgg99x/FGDownloader/issues/4

2.HJDownloadManager

• 地址
  https://github.com/WuHuijian/HJDownloadManager

• 移除任務(wù)示例

- (NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath
{
   __weak HJDownloadListCell *weakCell = [tableView cellForRowAtIndexPath:indexPath];
    __weak typeof(self) weakSelf = self;
    
    UITableViewRowAction *action = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"刪除" handler:^(UITableViewRowAction *action, NSIndexPath *indexPath) {
        [tableView beginUpdates];
        
        HJDownloadModel *downloadModel = weakCell.downloadModel;
        [kHJDownloadManager stopWithDownloadModel:weakSelf.datas[indexPath.row]];
        [weakSelf.datas removeObject:downloadModel];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationBottom];
       
        [tableView endUpdates];
    }];
    

• 問題
  下載進(jìn)度的回調(diào)可能有BUG：可能是這個(gè)回調(diào)不準(zhǔn)_downloadModel.progressChanged。表現(xiàn)為：直到下載成功才直到下載了，下載中無法知道是否下載狀態(tài)。

• 問題地址
  https://github.com/WuHuijian/HJDownloadManager/issues/5

3.TCBlobDownload

• 地址
  https://github.com/thibaultcha/TCBlobDownload

• 刪除任務(wù)示例

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        TCBlobDownloader *download = self.currentDownloads[indexPath.row];
        [download cancelDownloadAndRemoveFile:YES];
        
        NSInteger index = [self.currentDownloads indexOfObject:download];
        
        UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:index
                                                                                         inSection:0]];
        [cell.detailTextLabel setText:[self subtitleForDownload:download]];
        
        [cell setEditing:NO animated:YES];
    }
}

• 問題

它的Demo演示還是有點(diǎn)問題。添加了一個(gè)實(shí)際可下載的任務(wù)，還是無法下載。

4. MCDownloadManager

• 地址
  https://github.com/agelessman/MCDownloadManager

• 刪除任務(wù)示例

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [[MCDownloadManager defaultInstance] removeWithURL:self.urls[indexPath.row]];
        [self.tableView reloadData];
    }
}

image.png

• 問題

它這個(gè)刪除還是有點(diǎn)問題： 刪除文件后，receipt 的標(biāo)記還是 MCDownloadStateCompleted 。它的作者也新建了一個(gè)基于NSOperation的框架MCDownloader取代它。

5. MCDownloader

• 地址
  https://github.com/agelessman/MCDownloader

• 移除任務(wù)示例

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        MCDownloadReceipt *receipt = [[MCDownloader sharedDownloader] downloadReceiptForURLString:[self urls][indexPath.row]];
        [[MCDownloader sharedDownloader] remove:receipt completed:^{
            [self.tableView reloadData];
        }];
        
    }
}

• 問題
  無法下載HTTP的資源，會(huì)報(bào)錯(cuò)，解決辦法可以是允許http連接。參考http://www.itdecent.cn/p/b4389e7346d2。

6. TYDownloadManager

• 地址
  https://github.com/12207480/TYDownloadManager

• 移除下載任務(wù)

if (_downloadModel.state == TYDownloadStateReadying) {
        [manager cancleWithDownloadModel:_downloadModel];
        return;
    }