笔者目前比较关注的点是第三方框架中，删除指定下载任务的处理逻辑。
1.FGDownloader
- (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];
});
});
}
问题
移除的方法里边有bug 当其他任务在下载的时候 移除会导致无法暂停
[[FGGDownloadManager shredManager] removeForUrl:model.url file:model.destinationPath];移除的时候下载队列出问题了
2.HJDownloadManager
- (NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath
{
__weak HJDownloadListCell *weakCell = [tableView cellForRowAtIndexPath:indexPath];
__weak typeof(self) weakSelf = self;
UITableViewRowAction *action = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"删除" 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];
}];
- 问题
下载进度的回调可能有BUG：可能是这个回调不准_downloadModel.progressChanged。表现为：直到下载成功才直到下载了，下载中无法知道是否下载状态。
3.TCBlobDownload
- (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];
}
}
- 问题
它的Demo演示还是有点问题。添加了一个实际可下载的任务，还是无法下载。
4. MCDownloadManager
- (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
- 问题
它这个删除还是有点问题： 删除文件后，receipt 的标记还是 MCDownloadStateCompleted 。它的作者也新建了一个基于NSOperation的框架MCDownloader取代它。
5. MCDownloader
- (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];
}];
}
}
- 问题
无法下载HTTP的资源，会报错，解决办法可以是允许http连接。参考https://www.jianshu.com/p/b4389e7346d2。
6. TYDownloadManager
if (_downloadModel.state == TYDownloadStateReadying) {
[manager cancleWithDownloadModel:_downloadModel];
return;
}
