Question

我正在使用ASIHTTPRequest下载文件。我的自定义UITableViewCell有UIProgressView，其中显示了对al下载的跟踪（每行一个）。我正在使用的单元格是自定义的，我覆盖了PrepareForReuse方法，但是当我在tableview中进行滚动时，我发现了一个问题，单元格中的所有进度视图都被重置为方法PrepareforReuse。

如何才能正确显示progressView？谢谢！

DownloadViewController.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

        static NSString *CellIdentifier = @"DownloadsCell";

        DownloadCell *cell = (DownloadCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
            cell = [[DownloadCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        }
        if (indexPath.section == 0) {
            cell.cellLabel.text = (NSString *)[names objectAtIndex:indexPath.row];
            [cell.cellImageView setImage:[UIImage imageNamed:@"curso.png"] forState:UIControlStateNormal];
            //cell.cellImageView.tag = indexPath.row;

            ASIHTTPRequest *request;

                request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:[urls objectAtIndex:indexPath.row]]];

                NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                NSString *path = [[[[paths objectAtIndex:0] stringByAppendingPathComponent:@"Downloads"] stringByAppendingPathComponent:login] stringByAppendingPathComponent:[[download curso] ID]];
                NSError *error;
                if (![[NSFileManager defaultManager] fileExistsAtPath:path]){
                    if (![[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:NO attributes:nil error:&error]){
                        NSLog(@"Create directory 5 error: %@", error);
                    }
                }else path = [path stringByAppendingPathComponent:[names objectAtIndex:indexPath.row]];

                NSString *tmpPath = [[[paths objectAtIndex:0] stringByAppendingPathComponent:@"Downloads"] stringByAppendingPathComponent:@"TMP"];
                NSError *error2;
                if (![[NSFileManager defaultManager] fileExistsAtPath:tmpPath]){
                    if (![[NSFileManager defaultManager] createDirectoryAtPath:tmpPath withIntermediateDirectories:NO attributes:nil error:&error]){
                        NSLog(@"Create directory TMP error: %@", error2);
                    }
                }
                [request setDownloadDestinationPath:path];
                [request setTemporaryFileDownloadPath:[[tmpPath stringByAppendingPathComponent:[names objectAtIndex:indexPath.row]]stringByAppendingString:@".download"]];
                [request setAllowResumeForFileDownloads:YES];
                [request setDownloadProgressDelegate:cell.cellProgressView];
                //[request setDelegate:self];
                [request setUserInfo:[NSDictionary dictionaryWithObjectsAndKeys:
                                      [names objectAtIndex:indexPath.row], @"name",
                                      [urls objectAtIndex:indexPath.row], @"url",
                                      nil]];
                [networkQueue addOperation:request];
                NSLog(@"Downloading %d...",indexPath.row);
}

[networkQueue go];

            return cell;
}

DownloadCell.m

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.contentView.frame = CGRectMake(0, 0, 320, 70);

        cellImageView = [[UIButton alloc] initWithFrame:CGRectMake(5, 4, 58, 52)];
        [self.contentView addSubview:cellImageView];

        cellLabel = [[UILabel alloc] initWithFrame:CGRectMake(70, 10, 200, 30)];
        cellLabel.backgroundColor = [UIColor clearColor];
        cellLabel.textAlignment = NSTextAlignmentLeft;
        cellLabel.textColor = [UIColor colorWithRed:1.0/255.0 green:19.0/255.0 blue:121.0/255.0 alpha:1.0];
        cellLabel.font = [UIFont fontWithName:@"Gill Sans" size:13.0];
        cellLabel.numberOfLines = 0;
        [self.contentView addSubview:cellLabel];

        cellProgressView = [[UIProgressView alloc] initWithFrame:CGRectMake(70, 40, 200, 15)];
        [self.contentView addSubview:cellProgressView];

        UIImageView * accesoryImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flechaAzul.png"]];
        self.accessoryView = accesoryImg;

    }
    return self;
}

- (void) prepareForReuse
{
    self.contentView.frame = CGRectMake(0, 0, 320, 70);
    self.contentView.backgroundColor = [UIColor whiteColor];

    cellImageView.frame = CGRectMake(5, 4, 58, 52);

    cellLabel.frame = CGRectMake(70, 10, 200, 30);
    cellLabel.backgroundColor = [UIColor clearColor];
    cellLabel.textAlignment = NSTextAlignmentLeft;
    cellLabel.textColor = [UIColor colorWithRed:1.0/255.0 green:19.0/255.0 blue:121.0/255.0 alpha:1.0];
    cellLabel.font = [UIFont fontWithName:@"Gill Sans" size:13.0];
    cellLabel.numberOfLines = 0;

    cellProgressView.frame = CGRectMake(70, 40, 200, 15);

    UIImageView * accesoryImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"flechaAzul.png"]];
    self.accessoryView = accesoryImg;

    self.selectionStyle = UITableViewCellSelectionStyleBlue;
    self.userInteractionEnabled = YES;
}

Answer 1

当您致电[request setDownloadProgressDelegate:cell.cellProgressView];时，request应立即使用当前进度更新委托。如果它在发送任何更新之前等待进度发生变化，那么在发生这种情况之前，您将看到空的进度值。

重复使用进度视图的单元格

1 个答案: