关于文件 断点 缓存下载这个案例的一些问题 about iosproject HOT 9 OPEN

我这里是自定义cell

在SDFileDownloadView.m的- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath方法中实现：

• (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
  {
  SDFileTableViewCell *cell = [_tableView cellForRowAtIndexPath:indexPath];

  [self cellDidSelectRow:cell];

}

• (void) cellDidSelectRow :(SDFileTableViewCell *)cell {

  // 1.0先隐藏掉下载按钮
  [cell.selectButton setHidden:YES];
  // 1.1显示下载进度label
  [cell.downloadSpeedLabel setHidden:NO];

  // 2.1 下载文件url
  NSArray<NSString *> *urls = @[

    @"http://teaching.csse.uwa.edu.au/units/CITS4401/practicals/James1_files/SPMP1.pdf",
    @"http://down.51rc.com/dwndoc/WrittenExamination/WrittenExperiences/dwn00006795.doc",
    @"http://video1.remindchat.com/20190905/1gEji0Sv/mp4/1gEji0Sv.mp4",
    @"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_20mb.mp4",
    @"http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4",
    @"http://mirror.aarnet.edu.au/pub/TED-talks/911Mothers_2010W-480p.mp4",
                              
   ];
  

  __weak typeof(self)weakSelf = self;

  [urls enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

    MJDownloadInfo *info = [[MJDownloadManager defaultManager] downloadInfoForURL:obj];
    
    if (info.state == MJDownloadStateCompleted) {
        // 下载完成之后，下载中图标更换为下载完成图标
        [cell.downloadSpeedLabel setHidden:YES];
        [cell.selectButton setHidden:NO];
        [cell.selectButton setImage:[UIImage imageNamed:@"downloadok"] forState:UIControlStateNormal];
    }else {
        // 未下载状态
        NSLog(@"222222222222");
    }
    
    
    if (info.state == MJDownloadStateResumed || info.state == MJDownloadStateWillResume) {
        
        
    } else if (info.state == MJDownloadStateSuspened || info.state == MJDownloadStateNone) {
        
        [[MJDownloadManager defaultManager] download:obj progress:^(NSInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
            
            dispatch_async(dispatch_get_main_queue(), ^{
                
                // 2.2 下载中进度显示
                cell.downloadSpeedLabel.text = [NSString stringWithFormat:@"%.2f%%", (CGFloat)totalBytesWritten / totalBytesExpectedToWrite * 100.0];
                
            });
            
        } state:^(MJDownloadState state, NSString *file, NSError *error) {
            
            dispatch_async(dispatch_get_main_queue(), ^{
                
                // 2.3 下载完成，改变按钮状态，保存下载文件路径，保存cell点击状态
                if (state == MJDownloadStateCompleted) {
                    
                    [cell.downloadSpeedLabel setHidden:YES];
                    [cell.selectButton setHidden:NO];
                    [cell.selectButton setImage:[UIImage imageNamed:@"downloadok"] forState:UIControlStateNormal];
                    
                    
                    NSLog(@"打印保存文件路径地址 ：%@",file);
                    
                }
            });
        }];
        
    }else if (info.state == MJDownloadStateCompleted) {
        
        // 已下载完成的文件取url链接跳转阅读控制器
        NSString * filepath = [NSString stringWithFormat:@"%@",info.file];
        
        if ([self.delegate respondsToSelector:@selector(cellFilePathStr:)]) {
            
            // 移除下载列表视图
            [self removeFromSuperview];
            // 代理方法跳转阅读文档控制器
            [self.delegate cellFilePathStr:filepath];
        }
    }
  

  }];
  }

发现点击一行cell时，可以正常实现下载文件，但是当我想实现多点击几行cell让它多文件同时下载的时候，不知道应该怎么去实现，希望得到您的帮助

from iosproject.

考虑到cell的复用问题; 建议您这里修改下, 优先更新模型数据, 再更新UI数据

from iosproject.

抱歉, 注释写的不是很清楚, 补了些注释, 看下还有什么疑问吗?

// 数据
NSArray<NSString *> *urls = @[
@"http://teaching.csse.uwa.edu.au/units/CITS4401/practicals/James1_files/SPMP1.pdf",
@"http://down.51rc.com/dwndoc/WrittenExamination/WrittenExperiences/dwn00006795.doc",
@"http://video1.remindchat.com/20190905/1gEji0Sv/mp4/1gEji0Sv.mp4",
@"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_20mb.mp4",
@"http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4",
@"http://mirror.aarnet.edu.au/pub/TED-talks/911Mothers_2010W-480p.mp4",
];

self.title = @"点击Cell开始/暂停下载";
LMJWeak(self);
// 遍历URL个数创建对应的模型数组
[urls enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    
    // 获取下载文件对象
    MJDownloadInfo *info = [[MJDownloadManager defaultManager] downloadInfoForURL:obj];
    
    NSString *subTitle = nil;
    // 比对缓存是否下载完毕
    if (info.state == MJDownloadStateCompleted) {
        subTitle = @"播放";
    }else {
        // 比对缓存进度
        CGFloat progress = ((CGFloat)info.totalBytesWritten) / info.totalBytesExpectedToWrite * 100;
        subTitle = [NSString stringWithFormat:@"进度: %.2f%%, 点击开始", isnan(progress) ? 0 : progress];
    }
    
    // 添加数据模型, 和  绑定点击事件;
    // 考虑到cell的复用问题, 这个cell点击的时候, 调用了模型的itemOperation回调,
    self.addItem([LMJWordItem itemWithTitle:[obj.lastPathComponent substringToIndex:5] subTitle:subTitle itemOperation:^(NSIndexPath *indexPath) {
        
        // 文件下载状态: 下载中和在下载队列排队, 最大3个下载
        if (info.state == MJDownloadStateResumed || info.state == MJDownloadStateWillResume) {
            
            // 暂停
            [[MJDownloadManager defaultManager] suspend:info.url];
            
            // 获取进度
            CGFloat progress = ((CGFloat)info.totalBytesWritten) / info.totalBytesExpectedToWrite * 100;
            
            // 刷新模型
            weakself.sections.firstObject.items[indexPath.row].subTitle = [NSString stringWithFormat:@"暂停中..进度: %.2f%%", isnan(progress) ? 0 : progress];
            
            // 刷新UI, 获取不到就不刷新UI, 下次滚动cell赋值模型的时候, 还会刷新模型数据
            ((LMJSettingCell *)[weakself.tableView cellForRowAtIndexPath:indexPath]).item = weakself.sections.firstObject.items[indexPath.row];
            
        } else if (info.state == MJDownloadStateSuspened || info.state == MJDownloadStateNone) { // 暂停中和无状态; 开始下载
            
            // 开始下载obj = Url
            [[MJDownloadManager defaultManager] download:obj progress:^(NSInteger bytesWritten, NSInteger totalBytesWritten, NSInteger totalBytesExpectedToWrite) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    
                    // 更新模型
                    weakself.sections.firstObject.items[indexPath.row].subTitle = [NSString stringWithFormat:@"进度: %.2f%%", (CGFloat)totalBytesWritten / totalBytesExpectedToWrite * 100.0];

                    // 更新视图; 获取不到cell就不刷新UI, 下次滚动cell然后赋值模型的时候, 还会刷新模型数据
                    ((LMJSettingCell *)[weakself.tableView cellForRowAtIndexPath:indexPath]).item = weakself.sections.firstObject.items[indexPath.row];
                });
            } state:^(MJDownloadState state, NSString *file, NSError *error) {
                // 主线程刷新UI
                dispatch_async(dispatch_get_main_queue(), ^{
                    if (state == MJDownloadStateCompleted) {
                        // 更新模型
                        weakself.sections.firstObject.items[indexPath.row].subTitle = @"播放";
                        // 更新视图; 获取不到cell就不刷新UI, 下次滚动cell然后赋值模型的时候, 还会刷新模型数据
                        ((LMJSettingCell *)[weakself.tableView cellForRowAtIndexPath:indexPath]).item = weakself.sections.firstObject.items[indexPath.row];
                    }
                });
            }];
            
        }else if (info.state == MJDownloadStateCompleted) { // 文件是下载完毕的状态
            // 跳转播放, 根据实际情况点击
            VIDMoviePlayerViewController *playerVc = [[VIDMoviePlayerViewController alloc] init];
            playerVc.videoURL = [NSString stringWithFormat:@"file://%@", info.file];
            [weakself.navigationController pushViewController:playerVc animated:YES];
            
        }
        
    }]);
}];

// 添加2个操作模型, 绑定模型itemOperation操作
self.addItem([LMJWordItem itemWithTitle:@"全部开始" subTitle: nil itemOperation:^(NSIndexPath *indexPath) {
    [[MJDownloadManager defaultManager] resumeAll];
}]).addItem([LMJWordItem itemWithTitle:@"全部暂停" subTitle: nil itemOperation:^(NSIndexPath *indexPath) {
    [[MJDownloadManager defaultManager] suspendAll];
}]);

from iosproject.

尝试用了您这边的数据试了试, 应该是可以的; 建议您参考下cell的数据刷新和赋值模型数据的逻辑

from iosproject.

from iosproject.

from iosproject.

明天demo发下哦, 上传到您自己的github的仓库

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from iosproject.

您好，我这边已经将自己的demo上传至GitHub，地址 ：https://github.com/OmgKevin/FileDownload
，请帮忙看一下呀，万分感谢

from iosproject.